accountSubscribe

POST

wss://sol.nownodes.io/wss/{api_key}

Subscribe to an account to receive notifications when the lamports or data for a given account public key changes.

The optional dataSlice configuration limits the account data returned in each notification to a byte range. It does not change which account is monitored.

Connection URL

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wss://sol.nownodes.io/wss/{api_key}

Open the WebSocket connection, then send the JSON-RPC request below as a text frame.

Subscription request example

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{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accountSubscribe",
  "params": [
    "SysvarRent111111111111111111111111111111111",
    {
      "encoding": "base64",
      "commitment": "confirmed",
      "dataSlice": {
        "offset": 0,
        "length": 8
      }
    }
  ]
}

dataSlice.offset is the starting byte offset (zero-based), and dataSlice.length is the maximum number of bytes to return. In this example, each notification contains the first 8 bytes of account data.

Use a binary account-data encoding such as base58 or base64 with dataSlice. The space field, when present, describes the full account data size; it is not the length of the returned slice.

Subscription acknowledgement

After accepting the subscription, the server sends a JSON-RPC response containing the subscription ID:

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{
  "jsonrpc": "2.0",
  "result": 23784,
  "id": 1
}

Notification format

Account updates are sent in a separate accountNotification message. The notification result has the same account information structure as getAccountInfo; data contains only the requested slice when dataSlice is specified.

Base64 notification example (dataSlice: offset 0, length 8)

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{
  "jsonrpc": "2.0",
  "method": "accountNotification",
  "params": {
    "result": {
      "context": {
        "slot": 5199307
      },
      "value": {
        "data": [
          "AAAAAAAAAAA=",
          "base64"
        ],
        "executable": false,
        "lamports": 33594,
        "owner": "11111111111111111111111111111111",
        "rentEpoch": 635,
        "space": 80
      }
    },
    "subscription": 23784
  }
}

The example's data value represents 8 returned bytes. The space value remains the full account data size.

Body

application/json

jsonrpcstring2.0required

JSON-RPC protocol version.

idinteger | stringrequired

Client request identifier.

methodstringaccountSubscriberequired

Solana WebSocket subscription method.

paramsArray<string | object>required

Positional parameters: account public key, then optional account subscription configuration.

Show child attributes

One of

Account public key to subscribe to.

string

encodingstringbase58base64base64+zstdjsonParsed

Account data encoding. Use base58 or base64 for sliced binary account data.

commitmentstringprocessedconfirmedfinalized

Commitment level for the subscription.

dataSliceobject

Return only a selected byte range of account data in each notification.

Show child attributes

offsetinteger>= 0required

Zero-based byte offset from which account data is returned.

lengthinteger>= 0required

Maximum number of bytes to return.

Parameters

api_keystringrequiredpath

Your NOWNodes API key.

Response

200OK

WebSocket subscription acknowledgement message. This is not the account update notification; updates arrive later as accountNotification messages.

accountSubscribe

curl -X POST 'wss://sol.nownodes.io/wss/{api_key}' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "accountSubscribe",
    "params": [
      "SysvarRent111111111111111111111111111111111",
      {
        "encoding": "base64",
        "commitment": "confirmed",
        "dataSlice": {
          "offset": 0,
          "length": 8
        }
      }
    ]
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("wss://sol.nownodes.io/wss/{api_key}");
const result = await provider.send("accountSubscribe", [
  "SysvarRent111111111111111111111111111111111",
  {
    "encoding": "base64",
    "commitment": "confirmed",
    "dataSlice": {
      "offset": 0,
      "length": 8
    }
  }
]);
console.log(result);

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

uri = URI('wss://sol.nownodes.io/wss/{api_key}')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "accountSubscribe",
  "params": [
    "SysvarRent111111111111111111111111111111111",
    {
      "encoding": "base64",
      "commitment": "confirmed",
      "dataSlice": {
        "offset": 0,
        "length": 8
      }
    }
  ],
  "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("wss://sol.nownodes.io/wss/{api_key}"))
response = w3.provider.make_request("accountSubscribe", [
  "SysvarRent111111111111111111111111111111111",
  {
    "encoding": "base64",
    "commitment": "confirmed",
    "dataSlice": {
      "offset": 0,
      "length": 8
    }
  }
])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("wss://sol.nownodes.io/wss/{api_key}"),
});

const result = await client.request({
  method: "accountSubscribe",
  params: [
  "SysvarRent111111111111111111111111111111111",
  {
    "encoding": "base64",
    "commitment": "confirmed",
    "dataSlice": {
      "offset": 0,
      "length": 8
    }
  }
],
});

console.log(result);

const endpoint = "wss://sol.nownodes.io/wss/{api_key}";
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: "accountSubscribe", params: [
  "SysvarRent111111111111111111111111111111111",
  {
    "encoding": "base64",
    "commitment": "confirmed",
    "dataSlice": {
      "offset": 0,
      "length": 8
    }
  }
], id: 1 });
console.log(result);

const response = await fetch('wss://sol.nownodes.io/wss/{api_key}', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "id": 1,
      "method": "accountSubscribe",
      "params": [
        "SysvarRent111111111111111111111111111111111",
        {
          "encoding": "base64",
          "commitment": "confirmed",
          "dataSlice": {
            "offset": 0,
            "length": 8
          }
        }
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accountSubscribe",
  "params": [
    "SysvarRent111111111111111111111111111111111",
    {
      "encoding": "base64",
      "commitment": "confirmed",
      "dataSlice": {
        "offset": 0,
        "length": 8
      }
    }
  ]
}

response = requests.post('wss://sol.nownodes.io/wss/{api_key}', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('wss://sol.nownodes.io/wss/{api_key}')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "accountSubscribe",
    "params": [
      "SysvarRent111111111111111111111111111111111",
      {
        "encoding": "base64",
        "commitment": "confirmed",
        "dataSlice": {
          "offset": 0,
          "length": 8
        }
      }
    ]
  }'

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",
  "id": 1,
  "method": "accountSubscribe",
  "params": [
    "SysvarRent111111111111111111111111111111111",
    {
      "encoding": "base64",
      "commitment": "confirmed",
      "dataSlice": {
        "offset": 0,
        "length": 8
      }
    }
  ]
}

200

{
  "jsonrpc": "2.0",
  "result": 23784,
  "id": 1
}