BlockBook RES-API

v1.0.0

Base URLs

https://sys-btc.nownodes.io

https://sys-evm.nownodes.io

Authentication

api-keyAuthapiKey

API Key: api-key in header

MAINNET / Blockchain_RPCs

getbestblockhash

POST

https://sys-btc.nownodes.io/

Returns the hash of the best block in the most-work fully-validated chain. The best block is the tip of the blockchain, representing the most recent block that has been validated and added to the chain.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetbestblockhashrequired

paramsArray<any>required

Response

200OK

Valid response

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getbestblockhash

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getbestblockhash",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getbestblockhash",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getbestblockhash",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getbestblockhash",
  "params": []
}

{
  "result": "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getblock

POST

https://sys-btc.nownodes.io/

Returns information about the block with the given block hash. Optional verbosity levels determine the level of detail in the response:

0: Returns a string that is serialized, hex-encoded data for the block.
1: Returns a JSON object with basic block details and txids.
2: Returns a JSON object with detailed transaction info.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetblockrequired

paramsArray<string | integer>required

Parameters:

blockhash (string) – The hash of the block
verbosity (integer, optional) – Level of detail: 0, 1, or 2

Show child attributes

One of

string

integer

Response

200OK

Block information retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getblock

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblock",
    "params": [
      "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
      1
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblock",
      "params": [
        "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
        1
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblock",
  "params": [
    "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    1
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblock",
  "params": [
    "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    1
  ]
}

{
  "result": {
    "hash": "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    "confirmations": 100,
    "height": 855000,
    "version": 536870912,
    "versionHex": "20000000",
    "merkleroot": "a3e1f3...ff9a",
    "time": 1700000000,
    "mediantime": 1699995000,
    "nonce": 4282073135,
    "bits": "170d1f5d",
    "difficulty": 225983213292.9388,
    "chainwork": "0000000000000000000000000000000000000000230c36f8ff7f4fbee5b6a0c2",
    "previousblockhash": "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1",
    "nextblockhash": "0000000000000000000735c64b80cd102b8e4d67c2cc09db81fa4451a6f58e3a",
    "tx": [
      "string"
    ]
  },
  "error": {},
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getblockchaininfo

POST

https://sys-btc.nownodes.io/

Returns an object containing various state info regarding blockchain processing.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetblockchaininforequired

paramsArray<any>required

Response

200OK

Blockchain state information retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getblockchaininfo

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockchaininfo",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblockchaininfo",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockchaininfo",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockchaininfo",
  "params": []
}

{
  "result": {
    "chain": "main",
    "blocks": 855000,
    "headers": 855002,
    "bestblockhash": "0000000000000000000b27d455de872dfe8a8aa4f2efbfc5f1877357f7c8e97b",
    "difficulty": 225983213292.9388,
    "mediantime": 1700000500,
    "verificationprogress": 0.999999,
    "initialblockdownload": false,
    "chainwork": "0000000000000000000000000000000000000000230c36f8ff7f4fbee5b6a0c2",
    "size_on_disk": 495000000000,
    "pruned": false,
    "pruneheight": null,
    "automatic_pruning": false,
    "prune_target_size": null,
    "warnings": ""
  },
  "error": {},
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getblockcount

POST

https://sys-btc.nownodes.io/

Returns the number of blocks in the longest blockchain. This number increases as new blocks are added.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetblockcountrequired

paramsarrayrequired

This method takes no parameters.

Response

200OK

Current block height retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getblockcount

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockcount",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblockcount",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockcount",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockcount",
  "params": []
}

{
  "result": 855000,
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getblockhash

POST

https://sys-btc.nownodes.io/

Returns the block hash of the block at the given height in the blockchain. You must provide a block height (0-based index).

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetblockhashrequired

paramsArray<integer>required

Parameters:

height (integer) — The height (index) of the block.

Response

200OK

Block hash successfully retrieved

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getblockhash

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockhash",
    "params": [
      855000
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblockhash",
      "params": [
        855000
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockhash",
  "params": [
    855000
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockhash",
  "params": [
    855000
  ]
}

{
  "result": "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getblockheader

POST

https://sys-btc.nownodes.io/

Returns information about the block header given a block hash. You can specify whether to return a JSON object or raw hex-encoded string using the verbose flag.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetblockheaderrequired

paramsArray<string | boolean>required

Parameters:

blockhash (string) — The hash of the block.
verbose (boolean, optional) — If true, returns a JSON object; if false, returns a hex string. Default is true.

Show child attributes

One of

string

boolean

Response

200OK

Block header information retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getblockheader

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockheader",
    "params": [
      "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
      true
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblockheader",
      "params": [
        "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockheader",
  "params": [
    "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    true
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockheader",
  "params": [
    "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    true
  ]
}

{
  "result": {
    "hash": "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    "confirmations": 105,
    "height": 855000,
    "version": 536870912,
    "versionHex": "20000000",
    "merkleroot": "e3abc1234...",
    "time": 1700000000,
    "mediantime": 1699995000,
    "nonce": 1234567890,
    "bits": "170d1f5d",
    "difficulty": 225983213292.9388,
    "chainwork": "0000000000000000000000000000000000000000230c36f8ff7f4fbee5b6a0c2",
    "previousblockhash": "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1",
    "nextblockhash": "0000000000000000000735c64b80cd102b8e4d67c2cc09db81fa4451a6f58e3a"
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getblockstats

POST

https://sys-btc.nownodes.io/

Returns a variety of statistics about the block identified by its height or block hash. Available in Bitcoin Core v0.17.0 and later.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetblockstatsrequired

paramsArray<integer | string | Array<string>>required

Parameters:

height_or_hash (integer or string) — The block height (integer) or block hash (string).
stats (array, optional) — Specific stats to return. If not specified, returns all.

Show child attributes

One of

integer

string

Array<string>

Response

200OK

Block statistics returned successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getblockstats

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getblockstats",
    "params": [
      855000
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getblockstats",
      "params": [
        855000
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockstats",
  "params": [
    855000
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getblockstats",
  "params": [
    855000
  ]
}

{
  "result": {
    "avgfee": 1289,
    "avgfeerate": 3,
    "avgtxsize": 500,
    "blockhash": "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
    "height": 855000,
    "ins": 6000,
    "maxfee": 35000,
    "maxfeerate": 50,
    "maxtxsize": 2500,
    "medianfee": 1000,
    "mediantime": 1700000000,
    "mediantxsize": 250,
    "minfee": 200,
    "minfeerate": 1,
    "mintxsize": 100,
    "outs": 6500,
    "subsidy": 625000000,
    "swtotal_size": 1000000,
    "swtotal_weight": 3200000,
    "swtxs": 1800,
    "time": 1700000500,
    "total_out": 100000000000,
    "total_size": 1250000,
    "total_weight": 3999000,
    "totalfee": 2300000,
    "txs": 2200,
    "utxo_increase": 500,
    "utxo_size_inc": 20000,
    "utxo_increase_actual": 498
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getchaintips

POST

https://sys-btc.nownodes.io/

Returns information about all known tips in the block tree, including the main chain as well as orphaned forks.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetchaintipsrequired

paramsarrayrequired

This method takes no parameters.

Response

200OK

Chain tips retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getchaintips

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getchaintips",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getchaintips",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getchaintips",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getchaintips",
  "params": []
}

{
  "result": [
    {
      "height": 855000,
      "hash": "0000000000000000000a1e63be6bb1d1f4e6d2a345234a4a6b8f86e4f0de3c5a",
      "branchlen": 0,
      "status": "active"
    },
    {
      "height": 854980,
      "hash": "0000000000000000000f83a8e9a563e48e7b8e5400e38310ff299b7f30aaf8d9",
      "branchlen": 20,
      "status": "valid-fork"
    }
  ],
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getchaintxstats

POST

https://sys-btc.nownodes.io/

Compute statistics about the total number and rate of transactions in the blockchain. You can optionally specify the number of blocks and a block hash to start from.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetchaintxstatsrequired

paramsArray<integer | string>required

Parameters:

nblocks (integer, optional) — Number of blocks to average over. Default: 1 month worth (~4320).
blockhash (string, optional) — Hash of the block to stop at; defaults to the chain tip.

Show child attributes

One of

integer

string

Response

200OK

Chain transaction statistics retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getchaintxstats

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getchaintxstats",
    "params": [
      144,
      "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1"
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getchaintxstats",
      "params": [
        144,
        "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getchaintxstats",
  "params": [
    144,
    "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1"
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getchaintxstats",
  "params": [
    144,
    "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1"
  ]
}

{
  "result": {
    "time": 1700000000,
    "txcount": 889452301,
    "window_final_block_hash": "0000000000000000000c1e1ecf0aef02b1c3d4c44c920afe0aaec7d08d0019e1",
    "window_final_block_height": 855000,
    "window_block_count": 144,
    "window_tx_count": 17000,
    "window_interval": 11520,
    "txrate": 1.475
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getdifficulty

POST

https://sys-btc.nownodes.io/

Returns the current difficulty as a multiple of the minimum difficulty (lowest possible difficulty on the network). This is a relative measure of how difficult it is to find a new block.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetdifficultyrequired

paramsarrayrequired

This method takes no parameters.

Response

200OK

Difficulty value returned successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getdifficulty

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getdifficulty",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getdifficulty",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getdifficulty",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getdifficulty",
  "params": []
}

{
  "result": 8342150203598.12,
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getmempoolancestors

POST

https://sys-btc.nownodes.io/

Returns all in-mempool ancestor transactions for a given transaction ID. An ancestor is a transaction whose outputs are used as inputs in another transaction. You can get a summary or detailed object output.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetmempoolancestorsrequired

paramsArray<string | boolean>required

Parameters:

txid (string, required) — Transaction ID to query.
verbose (boolean, optional) — Whether to return a JSON object or just an array of txids. Default is false.

Show child attributes

One of

string

boolean

Response

200OK

Ancestor transaction(s) retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getmempoolancestors

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolancestors",
    "params": [
      "txid_example",
      true
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getmempoolancestors",
      "params": [
        "txid_example",
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolancestors",
  "params": [
    "txid_example",
    true
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolancestors",
  "params": [
    "txid_example",
    true
  ]
}

{
  "result": {
    "txid1": {
      "size": 250,
      "fee": 1000,
      "modifiedfee": 1000,
      "time": 1700000000,
      "height": 854998,
      "descendantcount": 1,
      "descendantsize": 600,
      "descendantfees": 3000,
      "ancestorcount": 1,
      "ancestorsize": 250,
      "ancestorfees": 1000,
      "depends": []
    },
    "txid2": "..."
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getmempooldescendants

POST

https://sys-btc.nownodes.io/

Returns all in-mempool descendant transactions for a given transaction ID. Descendants are transactions that depend on the outputs of the specified transaction. Can return either a simple list of transaction IDs or detailed JSON objects.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetmempooldescendantsrequired

paramsArray<string | boolean>required

Parameters:

txid (string, required) — Transaction ID to query descendants for.
verbose (boolean, optional) — Return JSON object if true, or list of txids if false. Default: false.

Show child attributes

One of

string

boolean

Response

200OK

Descendant transactions retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getmempooldescendants

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempooldescendants",
    "params": [
      "txid_example",
      true
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getmempooldescendants",
      "params": [
        "txid_example",
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempooldescendants",
  "params": [
    "txid_example",
    true
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempooldescendants",
  "params": [
    "txid_example",
    true
  ]
}

{
  "result": {
    "txid1": {
      "size": 300,
      "fee": 2000,
      "modifiedfee": 2100,
      "time": 1700000100,
      "height": 855000,
      "descendantcount": 0,
      "descendantsize": 0,
      "descendantfees": 0,
      "ancestorcount": 2,
      "ancestorsize": 600,
      "ancestorfees": 4000,
      "depends": [
        "txid_example"
      ]
    },
    "txid2": "..."
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getmempoolentry

POST

https://sys-btc.nownodes.io/

Returns detailed information about a transaction currently in the mempool. Requires the transaction ID (txid) as a parameter.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetmempoolentryrequired

paramsArray<string>required

Parameters:

txid (string, required) — Transaction ID to query.

Response

200OK

Mempool entry details retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getmempoolentry

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolentry",
    "params": [
      "txid_example"
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getmempoolentry",
      "params": [
        "txid_example"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolentry",
  "params": [
    "txid_example"
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolentry",
  "params": [
    "txid_example"
  ]
}

{
  "result": {
    "size": 226,
    "fee": 1210,
    "modifiedfee": 1210,
    "time": 1699990000,
    "height": 854000,
    "descendantcount": 2,
    "descendantsize": 452,
    "descendantfees": 3000,
    "ancestorcount": 1,
    "ancestorsize": 226,
    "ancestorfees": 1210,
    "depends": []
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getmempoolinfo

POST

https://sys-btc.nownodes.io/

Returns details about the current state of the mempool, including size, usage, fees, and more. No parameters required.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetmempoolinforequired

paramsArray<any>required

No parameters required

Response

200OK

Mempool info retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getmempoolinfo

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolinfo",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getmempoolinfo",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolinfo",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolinfo",
  "params": []
}

{
  "result": {
    "size": 1240,
    "bytes": 987654,
    "usage": 1234567,
    "maxmempool": 300000000,
    "mempoolminfee": 0.00001,
    "minrelaytxfee": 0.00001,
    "maxfeerate": 0.1
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getnetworkinfo

POST

https://sys-btc.nownodes.io/

Returns various state info regarding P2P networking

Body

application/json

jsonrpcstringrequired

JSON-RPC version

idstringrequired

Request identifier

methodstringrequired

RPC method name

paramsArray<any>

Method parameters (not required for getnetworkinfo)

Response

200OK

Successful response with network information

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getnetworkinfo

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getnetworkinfo",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getnetworkinfo",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getnetworkinfo",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getnetworkinfo",
  "params": []
}

{
  "result": {
    "version": 28000100,
    "subversion": "/Shibetoshi:1.14.9/",
    "protocolversion": 70016,
    "localservices": "0000000000000425",
    "localrelay": true,
    "timeoffset": 0,
    "networkactive": true,
    "connections": 8,
    "connections_in": 0,
    "connections_out": 8,
    "networks": [
      {
        "name": "ipv4",
        "limited": false,
        "reachable": true,
        "proxy": "",
        "proxy_randomize_credentials": false
      }
    ],
    "relayfee": 0.00001,
    "excessutxocharge": 0,
    "localaddresses": [],
    "warnings": ""
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getrawmempool

POST

https://sys-btc.nownodes.io/

Returns all transaction IDs currently in the mempool. If verbose is true, returns a JSON object with detailed mempool entry information for each transaction.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetrawmempoolrequired

paramsArray<boolean>required

Parameters:

verbose (boolean, optional) — If true, return detailed JSON objects instead of txid array. Default: false.

Response

200OK

Mempool transactions retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getrawmempool

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getrawmempool",
    "params": [
      true
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getrawmempool",
      "params": [
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getrawmempool",
  "params": [
    true
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getrawmempool",
  "params": [
    true
  ]
}

{
  "result": {
    "txid1": {
      "size": 226,
      "fee": 1210,
      "time": 1699990000,
      "height": 854000,
      "startingpriority": 1000,
      "currentpriority": 950,
      "descendantcount": 2,
      "descendantsize": 452,
      "descendantfees": 3000,
      "ancestorcount": 1,
      "ancestorsize": 226,
      "ancestorfees": 1210,
      "depends": []
    }
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

gettxout

POST

https://sys-btc.nownodes.io/

Returns details about an unspent transaction output (UTXO) specified by transaction ID and output index.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgettxoutrequired

paramsArray<string | integer | boolean>required

Parameters:

txid (string, required) — The transaction ID.
vout (integer, required) — The output index.
include_mempool (boolean, optional, default: true) — Whether to include mempool transactions.

Show child attributes

One of

string

integer

boolean

Response

200OK

UTXO details retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

gettxout

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "gettxout",
    "params": [
      "4e568274d63c824f5aa8215e2090d3dcfc97bf9922103dd06171ff779bd8cd5d",
      1,
      true
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "gettxout",
      "params": [
        "4e568274d63c824f5aa8215e2090d3dcfc97bf9922103dd06171ff779bd8cd5d",
        1,
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "gettxout",
  "params": [
    "4e568274d63c824f5aa8215e2090d3dcfc97bf9922103dd06171ff779bd8cd5d",
    1,
    true
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "gettxout",
  "params": [
    "4e568274d63c824f5aa8215e2090d3dcfc97bf9922103dd06171ff779bd8cd5d",
    1,
    true
  ]
}

{
  "result": {
    "bestblock": "000000000000000000010927cae2186713052813554025f0b3c2d2a09f28ff91",
    "confirmations": 1,
    "value": 3.16459147,
    "scriptPubKey": {
      "asm": "OP_DUP OP_HASH160 6582f2551e2a47e1ae8b03fb666401ed7c4552ef OP_EQUALVERIFY OP_CHECKSIG",
      "hex": "a9146582f2551e2a47e1ae8b03fb666401ed7c4552ef87",
      "reqSigs": 1,
      "type": "scripthash",
      "addresses": [
        "3Awm3FNpmwrbvAFVThRUFqgpbVuqWisni9"
      ]
    },
    "coinbase": true
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

gettxoutproof

POST

https://sys-btc.nownodes.io/

Returns a hex-encoded proof that one or more transactions are included in a block. The proof can be validated with verifytxoutproof.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgettxoutproofrequired

paramsArray<Array<string> | string>required

Parameters:

txids (array[string], required) — Array of transaction IDs to prove inclusion.
blockhash (string, optional) — Hash of the block to look for transactions. If omitted, searches the entire blockchain.

Show child attributes

One of

Array<string>

string

Response

200OK

Proof retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

gettxoutproof

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "gettxoutproof",
    "params": [
      [
        "ee652f0b40209bd02468de0c6336854f5efdd79fb865560aef2c46f4fa0b4a07",
        "cee11bc3bb3d9db8c4813ed2072a14369a15fcfb9e6bc5cb37a0b5bcc6aa59aa"
      ],
      null
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "gettxoutproof",
      "params": [
        [
          "ee652f0b40209bd02468de0c6336854f5efdd79fb865560aef2c46f4fa0b4a07",
          "cee11bc3bb3d9db8c4813ed2072a14369a15fcfb9e6bc5cb37a0b5bcc6aa59aa"
        ],
        null
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "gettxoutproof",
  "params": [
    [
      "ee652f0b40209bd02468de0c6336854f5efdd79fb865560aef2c46f4fa0b4a07",
      "cee11bc3bb3d9db8c4813ed2072a14369a15fcfb9e6bc5cb37a0b5bcc6aa59aa"
    ],
    null
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "gettxoutproof",
  "params": [
    [
      "ee652f0b40209bd02468de0c6336854f5efdd79fb865560aef2c46f4fa0b4a07",
      "cee11bc3bb3d9db8c4813ed2072a14369a15fcfb9e6bc5cb37a0b5bcc6aa59aa"
    ],
    null
  ]
}

{
  "result": "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",
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

preciousblock

POST

https://sys-btc.nownodes.io/

Marks a block as "precious," causing the node to reconsider the chain from that block. This can be used to manually reorganize the chain to a particular fork.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringpreciousblockrequired

paramsArray<string>required

Parameters:

blockhash (string, required) — The hash of the block to mark as precious.

Response

200OK

Block marked as precious successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

preciousblock

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "preciousblock",
    "params": [
      "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "preciousblock",
      "params": [
        "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "preciousblock",
  "params": [
    "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "preciousblock",
  "params": [
    "0000000000000000000a7b89e4d3f3bcebd7025fa72d2d9c7b3e8f7a3bc5c8a5"
  ]
}

{
  "result": null,
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

MAINNET / EVM

eth_accounts

Ethereum method - eth_accounts

POST

https://sys-btc.nownodes.io/

Returns an array of addresses controlled by the client.

Body

application/json

jsonrpcstringrequired

JSON-RPC version identifier

methodstringrequired

Name of the JSON-RPC method

paramsarrayrequired

No parameters are required for this method. This must be an empty array.

idintegerrequired

Unique identifier for the JSON-RPC request

Response

200OK

A list of Ethereum addresses

Authorization

api-keyAuthapiKey in header

Ethereum method - eth_accounts

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_accounts",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_accounts",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_accounts",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_accounts",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
  ]
}

eth_blockNumber

Ethereum method - eth_blockNumber

POST

https://sys-btc.nownodes.io/

Returns the number of the latest block on the chain in hexadecimal format.

Body

application/json

jsonrpcstringrequired

The JSON-RPC protocol version

methodstringrequired

Name of the method being called

paramsarrayrequired

This method does not take parameters; always send an empty array.

idintegerrequired

A unique ID for the request

Response

200OK

The latest block number

Authorization

api-keyAuthapiKey in header

Ethereum method - eth_blockNumber

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_blockNumber",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_blockNumber",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_blockNumber",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x10d4f"
}

eth_call

Ethereum method - eth_call

POST

https://sys-btc.nownodes.io/

Executes a call to a contract or address and returns the result without broadcasting a transaction.

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<object | string>required

The first object specifies the call transaction object. The second (optional) parameter specifies the block context.

Show child attributes

One of

fromstring

Address the call is sent from (optional)

tostringrequired

Target address for the call (required)

gasstring

Gas provided for the call, as hex

gasPricestring

Gas price in wei, as hex

valuestring

Amount of ETH sent, as hex (optional)

datastring

Compiled contract method call data

(Optional) Integer block number, or the string "latest", "earliest", or "pending".

string

idintegerrequired

Response

200OK

Result of the call

Authorization

api-keyAuthapiKey in header

Ethereum method - eth_call

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_call",
    "params": [
      {
        "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
        "to": "0xdAC17F958D2ee523a2206206994597C13D831ec7",
        "gas": "0x76c0",
        "gasPrice": "0x9184e72a000",
        "value": "0x0",
        "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd..."
      }
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_call",
      "params": [
        {
          "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
          "to": "0xdAC17F958D2ee523a2206206994597C13D831ec7",
          "gas": "0x76c0",
          "gasPrice": "0x9184e72a000",
          "value": "0x0",
          "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd..."
        }
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_call",
  "params": [
    {
      "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "to": "0xdAC17F958D2ee523a2206206994597C13D831ec7",
      "gas": "0x76c0",
      "gasPrice": "0x9184e72a000",
      "value": "0x0",
      "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd..."
    }
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_call",
  "params": [
    {
      "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "to": "0xdAC17F958D2ee523a2206206994597C13D831ec7",
      "gas": "0x76c0",
      "gasPrice": "0x9184e72a000",
      "value": "0x0",
      "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd..."
    }
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x00000000000000000000000000000000000000000000000000000000000003e8"
}

eth_chainId

Ethereum method - eth_chainId

POST

https://sys-btc.nownodes.io/

Returns the hexadecimal string of the current chain ID.

Body

application/json

jsonrpcstringrequired

JSON-RPC protocol version

methodstringrequired

Name of the method to call

paramsarrayrequired

This method does not require parameters. Use an empty array.

idintegerrequired

Unique identifier for the request

Response

200OK

Chain ID response

Authorization

api-keyAuthapiKey in header

Ethereum method - eth_chainId

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_chainId",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_chainId",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_chainId",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_chainId",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x1"
}

eth_coinbase

POST

https://sys-btc.nownodes.io/

Returns the Ethereum coinbase address (i.e., the address that receives mining rewards).

Body

application/json

jsonrpcstringrequired

methodstringeth_coinbaserequired

paramsarrayrequired

This method takes no parameters.

idintegerrequired

Response

200OK

JSON-RPC Response with the coinbase address

Authorization

api-keyAuthapiKey in header

eth_coinbase

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_coinbase",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_coinbase",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_coinbase",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_coinbase",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x0000000000000000000000000000000000000000"
}

eth_estimateGas

Estimate Gas for Transaction

POST

https://sys-btc.nownodes.io/

Simulates a transaction and returns an estimate of how much gas would be used.

Body

application/json

jsonrpcstringrequired

JSON-RPC protocol version

methodstringrequired

The method name

paramsArray<object | string>required

The transaction call object and an optional block tag.

Show child attributes

One of

fromstring

Address the transaction is sent from (optional)

tostringrequired

Destination address of the call

gasstring

Gas limit provided for execution (optional)

gasPricestring

Gas price in wei (optional)

valuestring

Amount of ETH to send, in hexadecimal wei (optional)

datastring

The compiled input data for the transaction (optional)

Optional block tag (e.g., "latest", "earliest", or a block number)

string

idintegerrequired

Request identifier

Response

200OK

Estimated gas amount

Authorization

api-keyAuthapiKey in header

Estimate Gas for Transaction

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [
      {
        "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
        "to": "0x6b175474e89094c44da98b954eedeac495271d0f",
        "gas": "0x76c0",
        "gasPrice": "0x9184e72a000",
        "value": "0x0",
        "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd"
      }
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_estimateGas",
      "params": [
        {
          "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
          "to": "0x6b175474e89094c44da98b954eedeac495271d0f",
          "gas": "0x76c0",
          "gasPrice": "0x9184e72a000",
          "value": "0x0",
          "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd"
        }
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "params": [
    {
      "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "to": "0x6b175474e89094c44da98b954eedeac495271d0f",
      "gas": "0x76c0",
      "gasPrice": "0x9184e72a000",
      "value": "0x0",
      "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd"
    }
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "params": [
    {
      "from": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "to": "0x6b175474e89094c44da98b954eedeac495271d0f",
      "gas": "0x76c0",
      "gasPrice": "0x9184e72a000",
      "value": "0x0",
      "data": "0x70a08231000000000000000000000000a0df350d2637096571f7a701cbc1c5fd"
    }
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x5208"
}

eth_feeHistory

POST

https://sys-btc.nownodes.io/

Returns fee market information for a range of blocks. This is typically used by wallets and other tools to estimate appropriate gas prices.

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string | integer | Array<number>>required

Parameters:

blockCount — number of blocks in the requested range.
newestBlock — highest block number in the requested range (can be "latest").
rewardPercentiles — list of percentile values to sample priority fees from each block (optional).

Show child attributes

Any of

string

integer

Array<number>

idintegerrequired

Response

200OK

JSON-RPC Response with fee history data

Authorization

api-keyAuthapiKey in header

eth_feeHistory

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_feeHistory",
    "params": [
      "0x5",
      "latest",
      [
        10,
        50,
        90
      ]
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_feeHistory",
      "params": [
        "0x5",
        "latest",
        [
          10,
          50,
          90
        ]
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_feeHistory",
  "params": [
    "0x5",
    "latest",
    [
      10,
      50,
      90
    ]
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_feeHistory",
  "params": [
    "0x5",
    "latest",
    [
      10,
      50,
      90
    ]
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "oldestBlock": "0x10d4f",
    "baseFeePerGas": [
      "0x1dcd65000"
    ],
    "gasUsedRatio": [
      0.85
    ],
    "reward": [
      [
        "0x59682f00"
      ]
    ]
  }
}

eth_gasPrice

Get Suggested Gas Price

POST

https://sys-btc.nownodes.io/

Returns the current gas price in wei as a hexadecimal string. This value is a node estimate based on recent blocks and mempool activity.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsarrayrequired

This method takes an empty array.

idintegerrequired

Request identifier

Response

200OK

Suggested gas price in wei

Authorization

api-keyAuthapiKey in header

Get Suggested Gas Price

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_gasPrice",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_gasPrice",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_gasPrice",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_gasPrice",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x09184e72a000"
}

eth_getBalance

Get ETH Balance of an Address

POST

https://sys-btc.nownodes.io/

Retrieves the balance (in wei) of a given Ethereum address. You can specify the block parameter to get the balance at a specific block.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<string | string>required

Array with 2 parameters:

Address (20-byte hex string with '0x' prefix)
Block tag (e.g., 'latest', 'earliest', 'pending', or block number in hex)

Show child attributes

One of

Ethereum address

string

Block tag

string

idintegerrequired

Request ID

Response

200OK

Balance (in wei) as hex string

Authorization

api-keyAuthapiKey in header

Get ETH Balance of an Address

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": [
      "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getBalance",
      "params": [
        "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getBalance",
  "params": [
    "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getBalance",
  "params": [
    "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x0234c8a3397aab58"
}

eth_getBlockByHash

Get Block by Hash

POST

https://sys-btc.nownodes.io/

Returns the block information for the specified block hash. The second parameter indicates whether to return full transaction objects or just transaction hashes.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<string>required

Array of parameters:

Block hash (string)
Boolean flag — if true, return full transactions; if false, only hashes.

idintegerrequired

Request ID

Response

200OK

Block information

Authorization

api-keyAuthapiKey in header

Get Block by Hash

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByHash",
    "params": [
      "0x7f9d3a8f8a6b6d4415a93b0f8d8a2bfc5a44d5e7a3cb1a3a5cf3a0f8d1c6c1d2",
      false
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getBlockByHash",
      "params": [
        "0x7f9d3a8f8a6b6d4415a93b0f8d8a2bfc5a44d5e7a3cb1a3a5cf3a0f8d1c6c1d2",
        false
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getBlockByHash",
  "params": [
    "0x7f9d3a8f8a6b6d4415a93b0f8d8a2bfc5a44d5e7a3cb1a3a5cf3a0f8d1c6c1d2",
    false
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockByHash",
  "params": [
    "0x7f9d3a8f8a6b6d4415a93b0f8d8a2bfc5a44d5e7a3cb1a3a5cf3a0f8d1c6c1d2",
    false
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "number": "0x1b4",
    "hash": "0x9b559a3d7ee67a0a8bb96ec93c93a0db3f9c66a355a3eb9f3f519c0f26a27c79",
    "parentHash": "0x5e8d5f58b0c1be8c3a3d172a41f9f4e35f2f15d5b3347f17a6c11a3aeadf9c10",
    "nonce": "0x0000000000000000",
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
    "logsBloom": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "stateRoot": "0xd7f8974fb5ac78d9e7a6ccfbcc2fdb5d98a9fdb716e0df485b4d39a5a6f85ebd",
    "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "miner": "0x829BD824B016326A401d083B33D092293333A830",
    "difficulty": "0x027f07",
    "totalDifficulty": "0x027f07",
    "extraData": "0x",
    "size": "0x027f07",
    "gasLimit": "0x9f759",
    "gasUsed": "0x9f759",
    "timestamp": "0x54e34e8e",
    "transactions": [
      "0x9f1c04b814a153e1b9f11b60d4e0f9349d07f9251e9b7b60aebb21721c8c07d7"
    ],
    "uncles": [
      "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
    ]
  }
}

eth_getBlockByNumber

Get Block by Number

POST

https://sys-btc.nownodes.io/

Returns the block information for the specified block number. The second parameter indicates whether to return full transaction objects or just transaction hashes.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<string>required

Array of parameters:

Block number (hex string, e.g., "0x1b4") or special tags ("latest", "earliest", "pending")
Boolean flag — if true, return full transactions; if false, only hashes.

idintegerrequired

Request ID

Response

200OK

Block information

Authorization

api-keyAuthapiKey in header

Get Block by Number

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByNumber",
    "params": [
      "0x1b4",
      false
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getBlockByNumber",
      "params": [
        "0x1b4",
        false
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getBlockByNumber",
  "params": [
    "0x1b4",
    false
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockByNumber",
  "params": [
    "0x1b4",
    false
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "number": "0x1b4",
    "hash": "0x9b559a3d7ee67a0a8bb96ec93c93a0db3f9c66a355a3eb9f3f519c0f26a27c79",
    "parentHash": "0x5e8d5f58b0c1be8c3a3d172a41f9f4e35f2f15d5b3347f17a6c11a3aeadf9c10",
    "nonce": "0x0000000000000000",
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
    "logsBloom": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "stateRoot": "0xd7f8974fb5ac78d9e7a6ccfbcc2fdb5d98a9fdb716e0df485b4d39a5a6f85ebd",
    "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "miner": "0x829BD824B016326A401d083B33D092293333A830",
    "difficulty": "0x027f07",
    "totalDifficulty": "0x027f07",
    "extraData": "0x",
    "size": "0x027f07",
    "gasLimit": "0x9f759",
    "gasUsed": "0x9f759",
    "timestamp": "0x54e34e8e",
    "transactions": [
      "0x9f1c04b814a153e1b9f11b60d4e0f9349d07f9251e9b7b60aebb21721c8c07d7"
    ],
    "uncles": [
      "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
    ]
  }
}

eth_getBlockReceipts

Get All Transaction Receipts for a Block

POST

https://sys-btc.nownodes.io/

Returns an array of transaction receipts for every transaction in the block specified by block number or block hash.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<string>required

One parameter:

Block identifier, which can be either:
- block number as hex string (e.g. "0x10d4f")
- or block hash as hex string (0x-prefixed)

idintegerrequired

Request identifier

Response

200OK

Array of transaction receipts in the block

Authorization

api-keyAuthapiKey in header

Get All Transaction Receipts for a Block

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockReceipts",
    "params": [
      "0x10d4f"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getBlockReceipts",
      "params": [
        "0x10d4f"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getBlockReceipts",
  "params": [
    "0x10d4f"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockReceipts",
  "params": [
    "0x10d4f"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "transactionHash": "0x5f4e3b4f5c4c4a6a93c2a3c9d1f47ee7e54b1f4e8a8e0cfd3aabb8a7a8295f7a",
      "transactionIndex": "0x1",
      "blockHash": "0xabc123def456...",
      "blockNumber": "0x10d4f",
      "from": "0x1234567890abcdef1234567890abcdef12345678",
      "to": "0xabcdefabcdefabcdefabcdefabcdefabcdef",
      "cumulativeGasUsed": "0x5208",
      "gasUsed": "0x5208",
      "contractAddress": "0xcontractaddresshere",
      "logs": [
        {
          "removed": false,
          "logIndex": "0x0",
          "transactionIndex": "0x1",
          "transactionHash": "0x5f4e3b4f5c4c4a6a93c2a3c9d1f47ee7e54b1f4e8a8e0cfd3aabb8a7a8295f7a",
          "blockHash": "0xabc123def456...",
          "blockNumber": "0x10d4f",
          "address": "0xcontractaddresshere",
          "data": "0x0000000000000000000000000000000000000000000000000000000000000000",
          "topics": [
            "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
          ]
        }
      ],
      "status": "0x1",
      "root": "0x..."
    }
  ]
}

eth_getBlockTransactionCountByHash

Get Transaction Count by Block Hash

POST

https://sys-btc.nownodes.io/

Returns the number of transactions contained in the block with the given hash.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<string>required

Array containing a single parameter:

Block hash as a hex string (32 bytes with 0x prefix)

idintegerrequired

Request ID

Response

200OK

Number of transactions in the block

Authorization

api-keyAuthapiKey in header

Get Transaction Count by Block Hash

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockTransactionCountByHash",
    "params": [
      "0x9b559a3d7ee67a0a8bb96ec93c93a0db3f9c66a355a3eb9f3f519c0f26a27c79"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getBlockTransactionCountByHash",
      "params": [
        "0x9b559a3d7ee67a0a8bb96ec93c93a0db3f9c66a355a3eb9f3f519c0f26a27c79"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getBlockTransactionCountByHash",
  "params": [
    "0x9b559a3d7ee67a0a8bb96ec93c93a0db3f9c66a355a3eb9f3f519c0f26a27c79"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockTransactionCountByHash",
  "params": [
    "0x9b559a3d7ee67a0a8bb96ec93c93a0db3f9c66a355a3eb9f3f519c0f26a27c79"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x8"
}

eth_getBlockTransactionCountByNumber

Get Transaction Count by Block Number

POST

https://sys-btc.nownodes.io/

Returns the number of transactions contained in the block with the given block number.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<string>required

Array containing a single parameter:

Block number as a hex string (e.g. "0x10d4f" for block 69007) or
predefined block tags such as "latest", "earliest", or "pending"

idintegerrequired

Request ID

Response

200OK

Number of transactions in the block

Authorization

api-keyAuthapiKey in header

Get Transaction Count by Block Number

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockTransactionCountByNumber",
    "params": [
      "0x10d4f"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getBlockTransactionCountByNumber",
      "params": [
        "0x10d4f"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getBlockTransactionCountByNumber",
  "params": [
    "0x10d4f"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getBlockTransactionCountByNumber",
  "params": [
    "0x10d4f"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x8"
}

eth_getCode

Get Contract Bytecode at Address

POST

https://sys-btc.nownodes.io/

Returns the contract code stored at a given address. If the address is an externally owned account (EOA), it returns "0x".

Body

application/json

jsonrpcstringrequired

JSON-RPC version.

methodstringrequired

JSON-RPC method name.

paramsArray<string>required

Parameters array with two elements:

The address to get the code for (hex string, 0x-prefixed).
The block number or block tag (e.g., "latest", "earliest", "pending").

idintegerrequired

Request identifier.

Response

200OK

Contract bytecode in hex format

Authorization

api-keyAuthapiKey in header

Get Contract Bytecode at Address

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": [
      "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
      "latest"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getCode",
      "params": [
        "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
        "latest"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
    "latest"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
    "latest"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x6080604052348015600f57600080fd5b5060..."
}

eth_getFilterChanges

Get Filter Changes

POST

https://sys-btc.nownodes.io/

Returns an array of logs that occurred since the last poll for the specified filter ID. The filter must have been previously created with eth_newFilter or eth_newBlockFilter or eth_newPendingTransactionFilter.

Body

application/json

jsonrpcstringrequired

JSON-RPC version.

methodstringrequired

JSON-RPC method name.

paramsArray<string>required

Parameters array with a single element:

The filter ID (hex string).

idintegerrequired

Request identifier.

Response

200OK

Array of log objects or transaction hashes depending on filter type

Authorization

api-keyAuthapiKey in header

Get Filter Changes

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getFilterChanges",
    "params": [
      "0x16"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getFilterChanges",
      "params": [
        "0x16"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getFilterChanges",
  "params": [
    "0x16"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getFilterChanges",
  "params": [
    "0x16"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
      ],
      "data": "0x000000000000000000000000000000000000000000000000000000000000003e8",
      "blockNumber": "0x1b4",
      "transactionHash": "0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
      "transactionIndex": "0x0",
      "blockHash": "0xabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcd",
      "logIndex": "0x0",
      "removed": false
    }
  ]
}

eth_getFilterLogs

Get Filter Logs

POST

https://sys-btc.nownodes.io/

Returns all logs matching a filter with the specified filter ID. The filter must have been previously created with eth_newFilter.

Body

application/json

jsonrpcstringrequired

JSON-RPC version.

methodstringrequired

JSON-RPC method name.

paramsArray<string>required

Parameters array with one element:

The filter ID (hex string).

idintegerrequired

Request identifier.

Response

200OK

Array of log objects matching the filter

Authorization

api-keyAuthapiKey in header

Get Filter Logs

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getFilterLogs",
    "params": [
      "0x16"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getFilterLogs",
      "params": [
        "0x16"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getFilterLogs",
  "params": [
    "0x16"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getFilterLogs",
  "params": [
    "0x16"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
      ],
      "data": "0x000000000000000000000000000000000000000000000000000000000000003e8",
      "blockNumber": "0x1b4",
      "transactionHash": "0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
      "transactionIndex": "0x0",
      "blockHash": "0xabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcd",
      "logIndex": "0x0",
      "removed": false
    }
  ]
}

eth_getLogs

Get Logs

POST

https://sys-btc.nownodes.io/

Returns an array of logs that match the filter criteria specified in the params. The filter object supports filtering by block range, addresses, and topics.

Body

application/json

jsonrpcstringrequired

JSON-RPC version.

methodstringrequired

JSON-RPC method name.

paramsArray<object>required

Parameters array with one element: the filter object.

Show child attributes

fromBlockstring

Starting block number (hex string) or "earliest", "latest", "pending".

toBlockstring

Ending block number (hex string) or "earliest", "latest", "pending".

addressstring | Array<string>

Contract address or list of addresses from which logs should originate.

topicsarray

Array of topic filters. Each topic can be a string, null, or an array of strings for OR filtering.

idintegerrequired

Request identifier.

Response

200OK

Array of log objects matching the filter

Authorization

api-keyAuthapiKey in header

Get Logs

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getLogs",
    "params": [
      {
        "fromBlock": "0x1b4",
        "toBlock": "0x1f4",
        "address": "0x1234567890abcdef1234567890abcdef12345678",
        "topics": [
          "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
          null,
          [
            "0x000000000000000000000000a7d9ddbe1f17865597fbd27ec712455208b6b76d",
            "0x000000000000000000000000bb9bc244d798123fde783fcc1c72d3bb8c189413"
          ]
        ]
      }
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getLogs",
      "params": [
        {
          "fromBlock": "0x1b4",
          "toBlock": "0x1f4",
          "address": "0x1234567890abcdef1234567890abcdef12345678",
          "topics": [
            "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
            null,
            [
              "0x000000000000000000000000a7d9ddbe1f17865597fbd27ec712455208b6b76d",
              "0x000000000000000000000000bb9bc244d798123fde783fcc1c72d3bb8c189413"
            ]
          ]
        }
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getLogs",
  "params": [
    {
      "fromBlock": "0x1b4",
      "toBlock": "0x1f4",
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
        null,
        [
          "0x000000000000000000000000a7d9ddbe1f17865597fbd27ec712455208b6b76d",
          "0x000000000000000000000000bb9bc244d798123fde783fcc1c72d3bb8c189413"
        ]
      ]
    }
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getLogs",
  "params": [
    {
      "fromBlock": "0x1b4",
      "toBlock": "0x1f4",
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
        null,
        [
          "0x000000000000000000000000a7d9ddbe1f17865597fbd27ec712455208b6b76d",
          "0x000000000000000000000000bb9bc244d798123fde783fcc1c72d3bb8c189413"
        ]
      ]
    }
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
      ],
      "data": "0x000000000000000000000000000000000000000000000000000000000000003e8",
      "blockNumber": "0x1b4",
      "transactionHash": "0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
      "transactionIndex": "0x0",
      "blockHash": "0xabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcdefabcd",
      "logIndex": "0x0",
      "removed": false
    }
  ]
}

eth_getStorageAt

Get Storage At

POST

https://sys-btc.nownodes.io/

Returns the value stored at position in the storage of the contract at address at the given blockNumber.

Body

application/json

jsonrpcstringrequired

JSON-RPC version.

methodstringrequired

JSON-RPC method name.

paramsArray<string>required

Parameters array:

address: string - Contract address to query storage from.
position: string - Storage slot position (hex string).
block number: string - Block number or keywords ("latest", "earliest", "pending").

idintegerrequired

Request identifier.

Response

200OK

Storage slot value at the specified position

Authorization

api-keyAuthapiKey in header

Get Storage At

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getStorageAt",
    "params": [
      "0x1234567890abcdef1234567890abcdef12345678",
      "0x0",
      "latest"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getStorageAt",
      "params": [
        "0x1234567890abcdef1234567890abcdef12345678",
        "0x0",
        "latest"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getStorageAt",
  "params": [
    "0x1234567890abcdef1234567890abcdef12345678",
    "0x0",
    "latest"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getStorageAt",
  "params": [
    "0x1234567890abcdef1234567890abcdef12345678",
    "0x0",
    "latest"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x000000000000000000000000000000000000000000000000000000000000000a"
}

eth_getTransactionByBlockHashAndIndex

Get Transaction by Block Hash and Index

POST

https://sys-btc.nownodes.io/

Retrieves the transaction from a block using the block's hash and the transaction's index position within the block.

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

Parameters:

blockHash (string): The 32-byte hash of the block.
transactionIndex (string): The transaction index (hex).

idintegerrequired

Response

200OK

A transaction object or null if no transaction was found.

Authorization

api-keyAuthapiKey in header

Get Transaction by Block Hash and Index

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionByBlockHashAndIndex",
    "params": [
      "string"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getTransactionByBlockHashAndIndex",
      "params": [
        "string"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getTransactionByBlockHashAndIndex",
  "params": [
    "string"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getTransactionByBlockHashAndIndex",
  "params": [
    "0xb3b20624a42dffdf1af8e8a6c9b338360585cc309831785f2138e1f9c35a1f09",
    "0x0"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "blockHash": "0xb3b20624a42dffdf1af8e8a6c9b338360585cc309831785f2138e1f9c35a1f09",
    "blockNumber": "0x5daf3b",
    "from": "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
    "gas": "0x5208",
    "gasPrice": "0x4a817c800",
    "hash": "0x3f1c...",
    "input": "0x",
    "nonce": "0x15",
    "to": "0x85h1c2d44cf8531a24b1030f78134677856f7b9f",
    "transactionIndex": "0x0",
    "value": "0x7f110",
    "type": "0x0"
  }
}

eth_getTransactionByBlockNumberAndIndex

Get Transaction by Block Number and Index

POST

https://sys-btc.nownodes.io/

Returns the information about a transaction using the block number and the transaction index within the block.

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

Parameters:

Block number in hex format (e.g., "0x5daf3b")
Transaction index in the block (e.g., "0x0")

idintegerrequired

Response

200OK

A transaction object, or null if not found.

Authorization

api-keyAuthapiKey in header

Get Transaction by Block Number and Index

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionByBlockNumberAndIndex",
    "params": [
      "string"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getTransactionByBlockNumberAndIndex",
      "params": [
        "string"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getTransactionByBlockNumberAndIndex",
  "params": [
    "string"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getTransactionByBlockNumberAndIndex",
  "params": [
    "0x5daf3b",
    "0x0"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "hash": "0x3f1c7f9e684bbd292f3b849df4c03ff4ffbd83ad2c6cb136a20ee2ebded7df72",
    "nonce": "0x15",
    "blockHash": "0xb3b20624a42dffdf1af8e8a6c9b338360585cc309831785f2138e1f9c35a1f09",
    "blockNumber": "0x5daf3b",
    "transactionIndex": "0x0",
    "from": "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
    "to": "0x85h1c2d44cf8531a24b1030f78134677856f7b9f",
    "value": "0x7f110",
    "gas": "0x5208",
    "gasPrice": "0x4a817c800",
    "input": "0x",
    "type": "0x0"
  }
}

eth_getTransactionByHash

Get transaction by hash

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

Array containing a single transaction hash

idintegerrequired

Response

200OK

Transaction object or null

Authorization

api-keyAuthapiKey in header

Get transaction by hash

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionByHash",
    "params": [
      "0x3f1c7f9e684bbd292f3b849df4c03ff4ffbd83ad2c6cb136a20ee2ebded7df72"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getTransactionByHash",
      "params": [
        "0x3f1c7f9e684bbd292f3b849df4c03ff4ffbd83ad2c6cb136a20ee2ebded7df72"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getTransactionByHash",
  "params": [
    "0x3f1c7f9e684bbd292f3b849df4c03ff4ffbd83ad2c6cb136a20ee2ebded7df72"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getTransactionByHash",
  "params": [
    "0x3f1c7f9e684bbd292f3b849df4c03ff4ffbd83ad2c6cb136a20ee2ebded7df72"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "hash": "0x3f1c7f9e684bbd292f3b849df4c03ff4ffbd83ad2c6cb136a20ee2ebded7df72",
    "nonce": "0x15",
    "blockHash": "0xb3b20624a42dffdf1af8e8a6c9b338360585cc309831785f2138e1f9c35a1f09",
    "blockNumber": "0x5daf3b",
    "transactionIndex": "0x0",
    "from": "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
    "to": "0x85h1c2d44cf8531a24b1030f78134677856f7b9f",
    "value": "0x7f110",
    "gas": "0x5208",
    "gasPrice": "0x4a817c800",
    "input": "0x",
    "type": "0x0"
  }
}

eth_getTransactionCount

Get transaction count (nonce) for address

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

address: The address to check for transaction count.
block: The block parameter (e.g., "latest", "earliest", "pending").

idintegerrequired

Response

200OK

Hex encoded nonce (transaction count)

Authorization

api-keyAuthapiKey in header

Get transaction count (nonce) for address

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionCount",
    "params": [
      "0x742d35cc6634c0532925a3b844bc454e4438f44e",
      "latest"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getTransactionCount",
      "params": [
        "0x742d35cc6634c0532925a3b844bc454e4438f44e",
        "latest"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getTransactionCount",
  "params": [
    "0x742d35cc6634c0532925a3b844bc454e4438f44e",
    "latest"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getTransactionCount",
  "params": [
    "0x742d35cc6634c0532925a3b844bc454e4438f44e",
    "latest"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0xa3"
}

eth_getTransactionReceipt

Get transaction receipt by hash

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

idintegerrequired

Response

200OK

Transaction receipt if mined, otherwise null

Authorization

api-keyAuthapiKey in header

Get transaction receipt by hash

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionReceipt",
    "params": [
      "0x5d1c7b4c8f3474891e1f632f85e7205b6d1a0e0ccbb5cfb1d3a2cf0e9d6f1df7"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getTransactionReceipt",
      "params": [
        "0x5d1c7b4c8f3474891e1f632f85e7205b6d1a0e0ccbb5cfb1d3a2cf0e9d6f1df7"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getTransactionReceipt",
  "params": [
    "0x5d1c7b4c8f3474891e1f632f85e7205b6d1a0e0ccbb5cfb1d3a2cf0e9d6f1df7"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getTransactionReceipt",
  "params": [
    "0x5d1c7b4c8f3474891e1f632f85e7205b6d1a0e0ccbb5cfb1d3a2cf0e9d6f1df7"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "transactionHash": "0x5d1c7b4c8f3474891e1f632f85e7205b6d1a0e0ccbb5cfb1d3a2cf0e9d6f1df7",
    "transactionIndex": "0x0",
    "blockHash": "0x9b559a...",
    "blockNumber": "0x5daf3b",
    "from": "0x742d35cc6634c0532925a3b844bc454e4438f44e",
    "to": "0x53d284357ec70ce289d6d64134dfac8e511c8a3d",
    "cumulativeGasUsed": "0x5208",
    "gasUsed": "0x5208",
    "contractAddress": null,
    "logs": [],
    "logsBloom": "0x000...",
    "status": "0x1"
  }
}

eth_getUncleByBlockHashAndIndex

Get uncle block by block hash and index

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

blockHash: 32-byte block hash
index: the uncle index as hex (e.g., "0x0" for the first uncle)

idintegerrequired

Response

200OK

Uncle block object or null

Authorization

api-keyAuthapiKey in header

Get uncle block by block hash and index

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getUncleByBlockHashAndIndex",
    "params": [
      "0x9b559a28a108e15b95e4e30b8a4a1e301dcdb4f3f7f0f79fd859f568f9d9ff34",
      "0x0"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getUncleByBlockHashAndIndex",
      "params": [
        "0x9b559a28a108e15b95e4e30b8a4a1e301dcdb4f3f7f0f79fd859f568f9d9ff34",
        "0x0"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getUncleByBlockHashAndIndex",
  "params": [
    "0x9b559a28a108e15b95e4e30b8a4a1e301dcdb4f3f7f0f79fd859f568f9d9ff34",
    "0x0"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getUncleByBlockHashAndIndex",
  "params": [
    "0x9b559a28a108e15b95e4e30b8a4a1e301dcdb4f3f7f0f79fd859f568f9d9ff34",
    "0x0"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "number": "0x5daf3c",
    "hash": "0xabc123...",
    "parentHash": "0xdef456...",
    "miner": "0x1234567890abcdef1234567890abcdef12345678",
    "difficulty": "0x3e8",
    "totalDifficulty": "0x1d4c",
    "extraData": "0x",
    "size": "0x220",
    "gasLimit": "0x7a1200",
    "gasUsed": "0x5208",
    "timestamp": "0x5bad55",
    "transactions": []
  }
}

eth_getUncleByBlockNumberAndIndex

Get uncle block by block number and index

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

blockNumber: The block number as hex string (e.g., "0x10fb78"), or "latest", "earliest", "pending".
index: The uncle index as hex (e.g., "0x0" for the first uncle).

idintegerrequired

Response

200OK

Uncle block object or null

Authorization

api-keyAuthapiKey in header

Get uncle block by block number and index

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getUncleByBlockNumberAndIndex",
    "params": [
      "0x5daf3b",
      "0x0"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getUncleByBlockNumberAndIndex",
      "params": [
        "0x5daf3b",
        "0x0"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getUncleByBlockNumberAndIndex",
  "params": [
    "0x5daf3b",
    "0x0"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getUncleByBlockNumberAndIndex",
  "params": [
    "0x5daf3b",
    "0x0"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "number": "0x5daf3c",
    "hash": "0xabc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1",
    "parentHash": "0xdef456def456def456def456def456def456def456def456def456def456def4",
    "miner": "0x1234567890abcdef1234567890abcdef12345678",
    "difficulty": "0x3e8",
    "totalDifficulty": "0x1d4c",
    "extraData": "0x",
    "size": "0x220",
    "gasLimit": "0x7a1200",
    "gasUsed": "0x5208",
    "timestamp": "0x5bad55",
    "transactions": []
  }
}

eth_getUncleCountByBlockHash

Get the number of uncle blocks by block hash

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

An array containing the block hash.

idintegerrequired

Response

200OK

Number of uncles in the block

Authorization

api-keyAuthapiKey in header

Get the number of uncle blocks by block hash

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getUncleCountByBlockHash",
    "params": [
      "0x9b559a937406429b662b9bd5b2be3c7a2ed36b5a0dbcf0d07a987f695705daec"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getUncleCountByBlockHash",
      "params": [
        "0x9b559a937406429b662b9bd5b2be3c7a2ed36b5a0dbcf0d07a987f695705daec"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getUncleCountByBlockHash",
  "params": [
    "0x9b559a937406429b662b9bd5b2be3c7a2ed36b5a0dbcf0d07a987f695705daec"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getUncleCountByBlockHash",
  "params": [
    "0x9b559a937406429b662b9bd5b2be3c7a2ed36b5a0dbcf0d07a987f695705daec"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x1"
}

eth_getUncleCountByBlockNumber

Get the number of uncle blocks by block number

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

An array containing the block number as a hex string.

idintegerrequired

Response

200OK

Number of uncle blocks in the block

Authorization

api-keyAuthapiKey in header

Get the number of uncle blocks by block number

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getUncleCountByBlockNumber",
    "params": [
      "0x10d4f"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getUncleCountByBlockNumber",
      "params": [
        "0x10d4f"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getUncleCountByBlockNumber",
  "params": [
    "0x10d4f"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_getUncleCountByBlockNumber",
  "params": [
    "0x10d4f"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x2"
}

eth_hashrate

POST

https://sys-btc.nownodes.io/

Returns the current mining hashrate reported by the client.

Body

application/json

jsonrpcstringrequired

methodstringeth_hashraterequired

paramsarrayrequired

This method takes no parameters.

idintegerrequired

Response

200OK

JSON-RPC response with the current mining hashrate

Authorization

api-keyAuthapiKey in header

eth_hashrate

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_hashrate",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_hashrate",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_hashrate",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_hashrate",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x3b9aca00"
}

eth_maxPriorityFeePerGas

Get recommended maxPriorityFeePerGas value

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsarrayrequired

No parameters are required.

idintegerrequired

Response

200OK

Returns the suggested maxPriorityFeePerGas value

Authorization

api-keyAuthapiKey in header

Get recommended maxPriorityFeePerGas value

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_maxPriorityFeePerGas",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_maxPriorityFeePerGas",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_maxPriorityFeePerGas",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_maxPriorityFeePerGas",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x3b9aca00"
}

eth_mining

POST

https://sys-btc.nownodes.io/

Checks whether the Ethereum client is actively mining.

Body

application/json

jsonrpcstringrequired

methodstringeth_miningrequired

paramsarrayrequired

This method does not accept parameters.

idintegerrequired

Response

200OK

JSON-RPC Response indicating mining status

Authorization

api-keyAuthapiKey in header

eth_mining

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_mining",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_mining",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_mining",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_mining",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": false
}

eth_newBlockFilter

Create a new block filter

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<any>required

This method does not require any parameters.

idintegerrequired

Response

200OK

Filter ID created successfully

Authorization

api-keyAuthapiKey in header

Create a new block filter

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_newBlockFilter",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_newBlockFilter",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_newBlockFilter",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_newBlockFilter",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x16"
}

eth_newFilter

Create a new log filter

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<object>required

Array with one object describing the filter options.

Show child attributes

fromBlockstring

Starting block number or tag ("latest", "earliest", "pending").

toBlockstring

Ending block number or tag.

addressstring | Array<string> | null

topicsArray<string | Array<string>> | null

Array of topic filters. Topics are 32-byte hashes identifying events.

Show child attributes

One of

string

Array<string>

idintegerrequired

Response

200OK

Filter ID created successfully

Authorization

api-keyAuthapiKey in header

Create a new log filter

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [
      {
        "fromBlock": "latest",
        "toBlock": "latest",
        "address": "0x1234567890abcdef1234567890abcdef12345678",
        "topics": [
          "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
        ]
      }
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_newFilter",
      "params": [
        {
          "fromBlock": "latest",
          "toBlock": "latest",
          "address": "0x1234567890abcdef1234567890abcdef12345678",
          "topics": [
            "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
          ]
        }
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_newFilter",
  "params": [
    {
      "fromBlock": "latest",
      "toBlock": "latest",
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
      ]
    }
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_newFilter",
  "params": [
    {
      "fromBlock": "latest",
      "toBlock": "latest",
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
      ]
    }
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x16"
}

eth_newPendingTransactionFilter

Create a filter for pending transactions

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<any>required

No parameters required for this method

idintegerrequired

Request identifier

Response

200OK

Filter ID created successfully

Authorization

api-keyAuthapiKey in header

Create a filter for pending transactions

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_newPendingTransactionFilter",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_newPendingTransactionFilter",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_newPendingTransactionFilter",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_newPendingTransactionFilter",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x16"
}

eth_sendRawTransaction

Send a raw signed transaction

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

Method name

paramsArray<string>required

Array containing a single signed transaction data (hex string)

idintegerrequired

Request ID

Response

200OK

Transaction successfully sent

Authorization

api-keyAuthapiKey in header

Send a raw signed transaction

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_sendRawTransaction",
    "params": [
      "0xf86b808504a817c800825208940000000000000000000000000000000000000000880de0b6b3a76400008026a0980..."
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_sendRawTransaction",
      "params": [
        "0xf86b808504a817c800825208940000000000000000000000000000000000000000880de0b6b3a76400008026a0980..."
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_sendRawTransaction",
  "params": [
    "0xf86b808504a817c800825208940000000000000000000000000000000000000000880de0b6b3a76400008026a0980..."
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_sendRawTransaction",
  "params": [
    "0xf86b808504a817c800825208940000000000000000000000000000000000000000880de0b6b3a76400008026a0c6a6..."
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x7f8a08576b8474e17e8311c2732029232892d450bfdc30816ffb133c2f8e3f1a"
}

eth_sendTransaction

Send a transaction using node-managed account

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<object>required

Transaction object

Show child attributes

fromstring

Address the transaction is sent from

tostring

Address the transaction is directed to

gasstring

Gas provided for the transaction (hex)

gasPricestring

Gas price in wei (hex)

valuestring

Value sent with the transaction in wei (hex)

datastring

(Optional) Data for contract interaction

idintegerrequired

Response

200OK

Transaction successfully sent

Authorization

api-keyAuthapiKey in header

Send a transaction using node-managed account

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_sendTransaction",
    "params": [
      {
        "from": "0x6A0bF1017C6e6Dd9D2BA447E2AAd951F13F7F7C3",
        "to": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
        "gas": "0x5208",
        "gasPrice": "0x3b9aca00",
        "value": "0x16345785d8a0000",
        "data": "0x"
      }
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_sendTransaction",
      "params": [
        {
          "from": "0x6A0bF1017C6e6Dd9D2BA447E2AAd951F13F7F7C3",
          "to": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
          "gas": "0x5208",
          "gasPrice": "0x3b9aca00",
          "value": "0x16345785d8a0000",
          "data": "0x"
        }
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_sendTransaction",
  "params": [
    {
      "from": "0x6A0bF1017C6e6Dd9D2BA447E2AAd951F13F7F7C3",
      "to": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "gas": "0x5208",
      "gasPrice": "0x3b9aca00",
      "value": "0x16345785d8a0000",
      "data": "0x"
    }
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_sendTransaction",
  "params": [
    {
      "from": "0x6A0bF1017C6e6Dd9D2BA447E2AAd951F13F7F7C3",
      "to": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "gas": "0x5208",
      "gasPrice": "0x3b9aca00",
      "value": "0x16345785d8a0000",
      "data": "0x"
    }
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x5f5c67a3120bb6e038f8460cb2e8393dcd1704b2e1ef7689e3ec6b867a2bcae4"
}

eth_sign

Sign arbitrary data using eth_sign

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

[address, data]

address: The account that will sign the data
data: The data to be signed (must be a hex string)

idintegerrequired

Response

200OK

Returns the signature of the message

Authorization

api-keyAuthapiKey in header

Sign arbitrary data using eth_sign

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_sign",
    "params": [
      "string"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_sign",
      "params": [
        "string"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_sign",
  "params": [
    "string"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_sign",
  "params": [
    "0x6A0bF1017C6e6Dd9D2BA447E2AAd951F13F7F7C3",
    "0x68656c6c6f20776f726c64"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x2c6401ff899fb4b2f7e118b9ff05ebc1428fc2e3a08779b589f1de94c8e56064d056f3d23b32bcb0e11aaee71a51bd8b3a7b361a3b4998b061"
}

eth_signTransaction

POST

https://sys-btc.nownodes.io/

Signs a transaction locally with the private key of the specified account.

Body

application/json

jsonrpcstringrequired

methodstringeth_signTransactionrequired

paramsArray<object>required

Array with a single object representing the transaction to sign.

Show child attributes

fromstringrequired

The address of the account that will sign the transaction.

tostring

The destination address of the transaction.

gasstring

Gas limit for the transaction, as a hex string.

gasPricestring

Gas price in wei, as a hex string.

valuestring

Amount of wei to send, as a hex string.

datastring

Data payload of the transaction, hex encoded.

noncestring

Nonce of the transaction, as a hex string.

chainIdinteger

The chain ID to protect against replay attacks.

idintegerrequired

Response

200OK

JSON-RPC response with the signed transaction data

Authorization

api-keyAuthapiKey in header

eth_signTransaction

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_signTransaction",
    "params": [
      {
        "from": "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
        "to": "0x85a3d76e3a6a4b16b5b442c1b11a03bdcc0a9f30",
        "gas": "0x5208",
        "gasPrice": "0x4a817c800",
        "value": "0xde0b6b3a7640000",
        "data": "0x",
        "nonce": "0x1",
        "chainId": 1
      }
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_signTransaction",
      "params": [
        {
          "from": "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
          "to": "0x85a3d76e3a6a4b16b5b442c1b11a03bdcc0a9f30",
          "gas": "0x5208",
          "gasPrice": "0x4a817c800",
          "value": "0xde0b6b3a7640000",
          "data": "0x",
          "nonce": "0x1",
          "chainId": 1
        }
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_signTransaction",
  "params": [
    {
      "from": "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
      "to": "0x85a3d76e3a6a4b16b5b442c1b11a03bdcc0a9f30",
      "gas": "0x5208",
      "gasPrice": "0x4a817c800",
      "value": "0xde0b6b3a7640000",
      "data": "0x",
      "nonce": "0x1",
      "chainId": 1
    }
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_signTransaction",
  "params": [
    {
      "from": "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
      "to": "0x85a3d76e3a6a4b16b5b442c1b11a03bdcc0a9f30",
      "gas": "0x5208",
      "gasPrice": "0x4a817c800",
      "value": "0xde0b6b3a7640000",
      "data": "0x",
      "nonce": "0x1",
      "chainId": 1
    }
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0xf86c808504a817c80082520894b60e8dd61c5d32be8058bb8eb970870f072331550880de0b6b3a76400008025a08b5a9e4f3e93096d046a9e4d4f28e0e2aab034c8998a2a4015304e80a40338c5a047d092f3246c4e11d995cbca7ed8a47aaf3dfeff8b6af33d57f4caba1c88b52c7"
}

eth_syncing

Check if node is syncing

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsarrayrequired

Must be an empty array.

idintegerrequired

Response

200OK

Returns sync status object or false

Authorization

api-keyAuthapiKey in header

Check if node is syncing

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_syncing",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_syncing",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_syncing",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_syncing",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": false
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "startingBlock": "0x384",
    "currentBlock": "0x386",
    "highestBlock": "0x454"
  }
}

eth_uninstallFilter

Uninstall an existing filter

POST

https://sys-btc.nownodes.io/

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<string>required

idintegerrequired

Response

200OK

Success or failure of the uninstall operation

Authorization

api-keyAuthapiKey in header

Uninstall an existing filter

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_uninstallFilter",
    "params": [
      "0x16"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_uninstallFilter",
      "params": [
        "0x16"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_uninstallFilter",
  "params": [
    "0x16"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_uninstallFilter",
  "params": [
    "0x16"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": false
}

net_listening

POST

https://sys-btc.nownodes.io/

Checks if the client is listening for network connections.

Body

application/json

jsonrpcstringrequired

methodstringnet_listeningrequired

paramsarrayrequired

This method takes no parameters.

idintegerrequired

Response

200OK

JSON-RPC response with listening status

Authorization

api-keyAuthapiKey in header

net_listening

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "net_listening",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "net_listening",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "net_listening",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "net_listening",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}

net_peerCount

POST

https://sys-btc.nownodes.io/

Returns the number of peers currently connected to the client.

Body

application/json

jsonrpcstringrequired

methodstringnet_peerCountrequired

paramsarrayrequired

This method takes no parameters.

idintegerrequired

Response

200OK

JSON-RPC response with the number of connected peers

Authorization

api-keyAuthapiKey in header

net_peerCount

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "net_peerCount",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "net_peerCount",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "net_peerCount",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "net_peerCount",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x8"
}

net_version

POST

https://sys-btc.nownodes.io/

Returns the current network ID of the Ethereum client.

Body

application/json

jsonrpcstringrequired

methodstringnet_versionrequired

paramsarrayrequired

This method takes no parameters.

idintegerrequired

Response

200OK

JSON-RPC response with the current network ID

Authorization

api-keyAuthapiKey in header

net_version

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "net_version",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "net_version",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "net_version",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "net_version",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "1"
}

web3_clientVersion

POST

https://sys-btc.nownodes.io/

Returns the current Ethereum client version.

Body

application/json

jsonrpcstringrequired

methodstringweb3_clientVersionrequired

paramsarrayrequired

This method takes no parameters.

idintegerrequired

Response

200OK

JSON-RPC response with the client version string

Authorization

api-keyAuthapiKey in header

web3_clientVersion

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "web3_clientVersion",
    "params": [],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "web3_clientVersion",
      "params": [],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "web3_clientVersion",
  "params": [],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "web3_clientVersion",
  "params": [],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "Geth/v1.10.8-stable-26675454/linux-amd64/go1.16.6"
}

web3_sha3

POST

https://sys-btc.nownodes.io/

Computes the Keccak-256 (SHA-3) hash of the given hex-encoded data.

Body

application/json

jsonrpcstringrequired

methodstringweb3_sha3required

paramsArray<string>required

Array containing a single hex-encoded data string to hash.

idintegerrequired

Response

200OK

JSON-RPC response with the Keccak-256 hash of the input data

Authorization

api-keyAuthapiKey in header

web3_sha3

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "web3_sha3",
    "params": [
      "0x68656c6c6f"
    ],
    "id": 1
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "web3_sha3",
      "params": [
        "0x68656c6c6f"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "web3_sha3",
  "params": [
    "0x68656c6c6f"
  ],
  "id": 1
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "2.0",
  "method": "web3_sha3",
  "params": [
    "0x68656c6c6f"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x5d41402abc4b2a76b9719d911017c592"
}

MAINNET / Mining_RPCs

getmininginfo

POST

https://sys-btc.nownodes.io/

Returns mining-related information such as current block, difficulty, network hash rate, etc. No parameters are required.

Body

application/json

jsonrpcstringrequired

JSON-RPC version (always "1.0")

idstringrequired

Request identifier

methodstringgetmininginforequired

The RPC method name

paramsarrayrequired

No parameters required

Response

200OK

Mining info retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getmininginfo

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmininginfo",
    "params": []
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getmininginfo",
      "params": []
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmininginfo",
  "params": []
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmininginfo",
  "params": []
}

{
  "result": {
    "blocks": 854000,
    "currentblockweight": 3990000,
    "currentblocktx": 2450,
    "difficulty": 568382716485.9244,
    "networkhashps": 130000000000000,
    "pooledtx": 5421,
    "chain": "main",
    "warnings": ""
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getnetworkhashps

POST

https://sys-btc.nownodes.io/

Returns the estimated network hashes per second (hash rate) based on the last nblocks blocks. This provides an estimate of the total computational power securing the network.

Body

application/json

jsonrpcstringrequired

The JSON-RPC protocol version (always "1.0")

idstringrequired

The identifier for the request

methodstringgetnetworkhashpsrequired

The name of the RPC method

paramsArray<integer>required

Optional parameters:

nblocks (integer) — The number of blocks to average over. Default is 120.
height (integer) — Use the block at this height instead of the current tip. Use -1 for the tip.

Show child attributes

One of

integer

Response

200OK

Hash rate retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getnetworkhashps

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getnetworkhashps",
    "params": [
      120,
      -1
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getnetworkhashps",
      "params": [
        120,
        -1
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getnetworkhashps",
  "params": [
    120,
    -1
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getnetworkhashps",
  "params": [
    120,
    -1
  ]
}

{
  "result": 134567890123456.78,
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

MAINNET / Rawtransactions_RPCs

createrawtransaction

POST

https://sys-btc.nownodes.io/

Creates an unsigned raw transaction from a list of inputs and outputs. The transaction is returned as a serialized hex string, which can then be signed and broadcast.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringcreaterawtransactionrequired

paramsArray<Array<object> | object | integer | boolean>required

Parameters:

inputs (array) — List of transaction inputs, each including txid and vout.
outputs (object) — Destination addresses and amounts.
locktime (integer, optional) — Locktime value.
replaceable (boolean, optional) — Whether this transaction signals BIP125 replaceability.

Show child attributes

One of

Array<object>

Show child attributes

txidstring

Transaction ID to spend

voutinteger

Output index

object

integer

boolean

Response

200OK

Unsigned raw transaction created successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

createrawtransaction

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "createrawtransaction",
    "params": [
      [
        {
          "txid": "my_txid_here",
          "vout": 0
        }
      ],
      {
        "bc1qrecipientaddress...": 0.001
      }
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "createrawtransaction",
      "params": [
        [
          {
            "txid": "my_txid_here",
            "vout": 0
          }
        ],
        {
          "bc1qrecipientaddress...": 0.001
        }
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "createrawtransaction",
  "params": [
    [
      {
        "txid": "my_txid_here",
        "vout": 0
      }
    ],
    {
      "bc1qrecipientaddress...": 0.001
    }
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "createrawtransaction",
  "params": [
    [
      {
        "txid": "my_txid_here",
        "vout": 0
      }
    ],
    {
      "bc1qrecipientaddress...": 0.001
    }
  ]
}

{
  "result": "0200000001abcd...00000000",
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

decoderawtransaction

POST

https://sys-btc.nownodes.io/

Decodes a raw hex-encoded Bitcoin transaction and returns a JSON object with readable fields. Useful for viewing the contents of raw transactions before broadcasting.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringdecoderawtransactionrequired

paramsArray<string>required

Parameters:

hexstring (string, required) — The raw transaction hex string.

Response

200OK

Transaction decoded successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

decoderawtransaction

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "decoderawtransaction",
    "params": [
      "0200000001abcd...00000000"
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "decoderawtransaction",
      "params": [
        "0200000001abcd...00000000"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "decoderawtransaction",
  "params": [
    "0200000001abcd...00000000"
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "decoderawtransaction",
  "params": [
    "0200000001abcd...00000000"
  ]
}

{
  "result": {
    "txid": "abcd1234...",
    "hash": "abcd1234...",
    "version": 2,
    "size": 225,
    "vsize": 144,
    "locktime": 0,
    "vin": [
      {
        "txid": "input_txid",
        "vout": 0,
        "scriptSig": {
          "asm": "asm_code",
          "hex": "hex_code"
        },
        "sequence": 4294967295
      }
    ],
    "vout": [
      {
        "value": 0.001,
        "n": 0,
        "scriptPubKey": {
          "asm": "asm_output",
          "hex": "hex_output",
          "type": "witness_v0_keyhash",
          "addresses": [
            "bc1q..."
          ]
        }
      }
    ]
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

decodescript

POST

https://sys-btc.nownodes.io/

Decodes a hex-encoded script (usually scriptPubKey) and returns a JSON representation including the script type and addresses. Useful for analyzing output scripts or creating Pay-to-Script-Hash addresses.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

idstringrequired

Request identifier

methodstringdecodescriptrequired

RPC method name

paramsArray<string>required

Parameters:

hexstring (string, required) — The script in hex format to decode.

Response

200OK

Script decoded successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

decodescript

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "decodescript",
    "params": [
      "00141d0f172a0ecb48aee1be1f2687d2963ae33f71a1"
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "decodescript",
      "params": [
        "00141d0f172a0ecb48aee1be1f2687d2963ae33f71a1"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "decodescript",
  "params": [
    "00141d0f172a0ecb48aee1be1f2687d2963ae33f71a1"
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "decodescript",
  "params": [
    "00141d0f172a0ecb48aee1be1f2687d2963ae33f71a1"
  ]
}

{
  "result": {
    "asm": "OP_0 1d0f172a0ecb48aee1be1f2687d2963ae33f71a1",
    "type": "witness_v0_keyhash",
    "reqSigs": 1,
    "addresses": [
      "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kygt080"
    ],
    "p2sh": "3QJmV3qfvL9SuYo34YihAf3sRCW3qSinyC"
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

getrawtransaction

POST

https://sys-btc.nownodes.io/

Retrieves a raw transaction by its txid. If verbose is false or omitted, the result is a raw hex string. If verbose is true, returns a JSON object with decoded transaction details.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringgetrawtransactionrequired

paramsArray<string | boolean>required

Parameters:

txid (string, required) — The transaction ID.
verbose (boolean, optional) — If true, return JSON; if false, return hex. Default: false.

Show child attributes

One of

string

boolean

Response

200OK

Transaction retrieved successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

getrawtransaction

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getrawtransaction",
    "params": [
      "txid_here",
      true
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getrawtransaction",
      "params": [
        "txid_here",
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getrawtransaction",
  "params": [
    "txid_here",
    true
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getrawtransaction",
  "params": [
    "txid_here",
    true
  ]
}

{
  "result": "0200000001abcd...00000000",
  "error": null,
  "id": "curltest"
}

{
  "result": {
    "txid": "abcd1234...",
    "hash": "abcd1234...",
    "version": 2,
    "size": 225,
    "vsize": 144,
    "locktime": 0,
    "vin": [
      "..."
    ],
    "vout": [
      "..."
    ],
    "hex": "0200000001abcd...00000000"
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

sendrawtransaction

POST

https://sys-btc.nownodes.io/

Submits a raw transaction (hex-encoded string) to the mempool and broadcasts it to the network. Returns the transaction ID (txid) if accepted.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringsendrawtransactionrequired

paramsArray<string | number | boolean>required

Parameters:

hexstring (string, required): The raw transaction in hex format.
maxfeerate (number or boolean, optional): Reject transactions with fees higher than this (BTC/KB). Use false to disable check.

Show child attributes

One of

string

number

boolean

Response

200OK

Transaction accepted and broadcasted

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

sendrawtransaction

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "sendrawtransaction",
    "params": [
      "0200000001abcd...00000000",
      false
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "sendrawtransaction",
      "params": [
        "0200000001abcd...00000000",
        false
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "sendrawtransaction",
  "params": [
    "0200000001abcd...00000000",
    false
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "sendrawtransaction",
  "params": [
    "0200000001abcd...00000000",
    false
  ]
}

{
  "result": "abcd1234txid",
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

signrawtransactionwithkey

POST

https://sys-btc.nownodes.io/

Signs inputs for a raw transaction using explicitly provided private keys, without needing access to a local wallet. Useful for offline signing or stateless transaction construction.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringsignrawtransactionwithkeyrequired

paramsArray<string | Array<string> | Array<object>>required

Parameters:

hexstring (string, required): The raw transaction hex string.
privkeys (array of strings, required): Array of WIF private keys.
prevtxs (array, optional): Array of previous output details for inputs to sign.

Show child attributes

One of

string

Array<string>

Array<object>

Show child attributes

txidstring

Transaction ID of the UTXO being spent.

voutinteger

Output index.

scriptPubKeystring

Script of the UTXO.

redeemScriptstring

(optional) Redeem script for P2SH inputs.

witnessScriptstring

(optional) Witness script for P2WSH inputs.

amountnumber

Amount in BTC of the UTXO.

Response

200OK

Transaction signed successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

signrawtransactionwithkey

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "signrawtransactionwithkey",
    "params": [
      "0200000001abcd...00000000",
      [
        "cV...yourWIFkey..."
      ],
      [
        {
          "txid": "abcd1234...",
          "vout": 0,
          "scriptPubKey": "76a914...88ac",
          "redeemScript": "0020...",
          "amount": 0.001
        }
      ]
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "signrawtransactionwithkey",
      "params": [
        "0200000001abcd...00000000",
        [
          "cV...yourWIFkey..."
        ],
        [
          {
            "txid": "abcd1234...",
            "vout": 0,
            "scriptPubKey": "76a914...88ac",
            "redeemScript": "0020...",
            "amount": 0.001
          }
        ]
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "signrawtransactionwithkey",
  "params": [
    "0200000001abcd...00000000",
    [
      "cV...yourWIFkey..."
    ],
    [
      {
        "txid": "abcd1234...",
        "vout": 0,
        "scriptPubKey": "76a914...88ac",
        "redeemScript": "0020...",
        "amount": 0.001
      }
    ]
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "signrawtransactionwithkey",
  "params": [
    "0200000001abcd...00000000",
    [
      "cV...yourWIFkey..."
    ],
    [
      {
        "txid": "abcd1234...",
        "vout": 0,
        "scriptPubKey": "76a914...88ac",
        "redeemScript": "0020...",
        "amount": 0.001
      }
    ]
  ]
}

{
  "result": {
    "hex": "0200000001abcd...00000000",
    "complete": true,
    "errors": []
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

MAINNET / Util_RPCs

signmessagewithprivkey

POST

https://sys-btc.nownodes.io/

Signs a message with the given private key (in WIF format). Returns the base64-encoded signature.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringsignmessagewithprivkeyrequired

paramsArray<string>required

Parameters:

privkey (string, required): The private key in WIF format.
message (string, required): The message to sign.

Response

200OK

Message signed successfully

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

signmessagewithprivkey

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "signmessagewithprivkey",
    "params": [
      "cV...yourWIFkey...",
      "This is my message."
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "signmessagewithprivkey",
      "params": [
        "cV...yourWIFkey...",
        "This is my message."
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "signmessagewithprivkey",
  "params": [
    "cV...yourWIFkey...",
    "This is my message."
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "signmessagewithprivkey",
  "params": [
    "cV...yourWIFkey...",
    "This is my message."
  ]
}

{
  "result": "H+JdK+U...signature==",
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

validateaddress

POST

https://sys-btc.nownodes.io/

Validate a Bitcoin address and return useful information such as whether it is valid, script, or witness, and optionally if it's linked to the wallet.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringvalidateaddressrequired

paramsArray<string>required

Parameters:

address (string, required): The Bitcoin address to validate.

Response

200OK

Address validation result

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

validateaddress

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "validateaddress",
    "params": [
      "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kygt080"
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "validateaddress",
      "params": [
        "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kygt080"
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "validateaddress",
  "params": [
    "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kygt080"
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "validateaddress",
  "params": [
    "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kygt080"
  ]
}

{
  "result": {
    "isvalid": true,
    "address": "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kygt080",
    "scriptPubKey": "0014751e76e8199196d454941c45d1b3a323f1433bd6",
    "isscript": false,
    "iswitness": true,
    "witness_version": 0,
    "witness_program": "751e76e8199196d454941c45d1b3a323f1433bd6"
  },
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

verifymessage

POST

https://sys-btc.nownodes.io/

Verify a message signature. Returns true if the signature is valid and corresponds to the provided address and message.

Body

application/json

jsonrpcstringrequired

idstringrequired

methodstringverifymessagerequired

paramsArray<string>required

Parameters:

address (string, required): The Bitcoin address to verify.
signature (string, required): The base64-encoded signature.
message (string, required): The original signed message.

Response

200OK

Signature verification result

401Unauthorized

Unauthorized

500Internal Server Error

Internal Server Error

Authorization

api-keyAuthapiKey in header

verifymessage

curl -X POST 'https://sys-btc.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "verifymessage",
    "params": [
      "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
      "H9zbxP...==",
      "This is a test message."
    ]
  }'

const response = await fetch('https://sys-btc.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "verifymessage",
      "params": [
        "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
        "H9zbxP...==",
        "This is a test message."
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "verifymessage",
  "params": [
    "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
    "H9zbxP...==",
    "This is a test message."
  ]
}

response = requests.post('https://sys-btc.nownodes.io/', json=payload)
data = response.json()

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "verifymessage",
  "params": [
    "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
    "H9zbxP...==",
    "This is a test message."
  ]
}

{
  "result": true,
  "error": null,
  "id": "curltest"
}

"Unknown API_key"

"Service is unavailable"

Documentation

Authentication

MAINNET / Blockchain_RPCs

getbestblockhash

Body

Response

Authorization

getblock

Body

Response

Authorization

getblockchaininfo

Body

Response

Authorization

getblockcount

Body

Response

Authorization

getblockhash

Body

Response

Authorization

getblockheader

Body

Response

Authorization

getblockstats

Body

Response

Authorization

getchaintips

Body

Response

Authorization

getchaintxstats

Body

Response

Authorization

getdifficulty

Body

Response

Authorization

getmempoolancestors

Body

Response

Authorization

getmempooldescendants

Body

Response

Authorization

getmempoolentry

Body

Response

Authorization

getmempoolinfo

Body

Response

Authorization

getnetworkinfo

Body

Response

Authorization

getrawmempool

Body

Response

Authorization

gettxout

Body

Response

Authorization

gettxoutproof

Body

Response

Authorization

preciousblock

Body

Response

Authorization

MAINNET / EVM