Create a new log filter

POST

https://bsc.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

eth_newFilter JSON-RPC method on BSC mainnet.

Body

application/json

Create a new log filter

Request payload for Create a new log filter.

jsonrpcstringrequired

JSON-RPC protocol version.

methodstringrequired

JSON-RPC method name.

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

Blockchain address.

topicsArray<string | Array<string>> | null

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

Show child attributes

Single entry in the topics array.

One of

The topics field.

string

Array<string>

idintegerrequired

Client-provided request identifier echoed in the response.

Response

200OK

Filter ID created successfully

401Unauthorized

Unauthorized: API key is present but rejected by the NOWNodes gateway.

405Method Not Allowed

Method Not Allowed. Returned by the NOWNodes gateway for malformed or unsupported gateway-level requests.

422Unprocessable Entity

Missing API key. The NOWNodes gateway returns plain text for this error.

500Internal Server Error

JSON-RPC method or upstream error

Create a new log filter

curl -X POST 'https://bsc.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
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://bsc.nownodes.io/");
const result = await provider.send("eth_newFilter", [
  {
    "fromBlock": "latest",
    "toBlock": "latest",
    "address": "0x1234567890abcdef1234567890abcdef12345678",
    "topics": [
      "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
    ]
  }
]);
console.log(result);

require 'eth'
require 'json'
require 'net/http'

uri = URI('https://bsc.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "eth_newFilter",
  "params": [
    {
      "fromBlock": "latest",
      "toBlock": "latest",
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "topics": [
        "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
      ]
    }
  ],
  "id": 1
}'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts JSON.parse(response.body)

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://bsc.nownodes.io/"))
response = w3.provider.make_request("eth_newFilter", [
  {
    "fromBlock": "latest",
    "toBlock": "latest",
    "address": "0x1234567890abcdef1234567890abcdef12345678",
    "topics": [
      "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
    ]
  }
])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://bsc.nownodes.io/"),
});

const result = await client.request({
  method: "eth_newFilter",
  params: [
  {
    "fromBlock": "latest",
    "toBlock": "latest",
    "address": "0x1234567890abcdef1234567890abcdef12345678",
    "topics": [
      "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
    ]
  }
],
});

console.log(result);

const endpoint = "https://bsc.nownodes.io/";
const apiKey = "YOUR_API_KEY";

async function nownodesRequest(payload) {
  const response = await fetch(endpoint, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "api-key": apiKey,
    },
    body: JSON.stringify(payload),
  });

  return response.json();
}

const result = await nownodesRequest({ jsonrpc: "2.0", method: "eth_newFilter", params: [
  {
    "fromBlock": "latest",
    "toBlock": "latest",
    "address": "0x1234567890abcdef1234567890abcdef12345678",
    "topics": [
      "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
    ]
  }
], id: 1 });
console.log(result);

const response = await fetch('https://bsc.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://bsc.nownodes.io/', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://bsc.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [
      {
        "fromBlock": "latest",
        "toBlock": "latest",
        "address": "0x1234567890abcdef1234567890abcdef12345678",
        "topics": [
          "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
        ]
      }
    ],
    "id": 1
  }'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

Request Body

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0xe657658d01aa5ccb6c043838bfa4d966"
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32602,
    "message": "invalid argument"
  }
}

Unknown API_key

Method Not Allowed

Missing API_key

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0xe657658d01aa5ccb6c043838bfa4d966",
  "error": {
    "code": -32005,
    "message": "service temporarily unavailable"
  }
}

Documentation

How to migrate to NOWNodes

Create a new log filter

Authorizations

Body

Response