Returns the chain id.

POST

wss://bsc.nownodes.io/wss/{apiKey}

Returns the EIP-155 chain id of the network. For BNB Smart Chain mainnet this is 0x38 (56).

Body

application/json

JSON-RPC 2.0 request for eth_chainId, sent as a text message over the WebSocket connection.

jsonrpcstringrequired

idintegerrequired

Request identifier echoed back in the response.

methodstringrequired

paramsArray<any>required

No parameters.

Parameters

apiKeystringrequiredpath

NOWNodes API key. Connect to wss://bsc.nownodes.io/wss/{apiKey}. The WebSocket handshake returns HTTP 403 when the key is missing or invalid.

Response

200OK

JSON-RPC response delivered over the WebSocket connection. Errors are reported inside the same envelope in the error field; see RpcError (live: code -32602 Invalid params for malformed arguments).

403Forbidden

Forbidden. The WebSocket handshake was rejected: the API key is missing or invalid (verified live: wrong and missing keys both return HTTP 403).

Returns the chain id.

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

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("wss://bsc.nownodes.io/wss/{apiKey}");
const result = await provider.send("eth_chainId", []);
console.log(result);

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

uri = URI('wss://bsc.nownodes.io/wss/{apiKey}')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "eth_chainId",
  "params": [],
  "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://bsc.nownodes.io/wss/{apiKey}"))
response = w3.provider.make_request("eth_chainId", [])
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "eth_chainId",
  params: [],
});

console.log(result);

const endpoint = "wss://bsc.nownodes.io/wss/{apiKey}";
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_chainId", params: [], id: 1 });
console.log(result);

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

const data = await response.json();

import requests

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

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

require 'net/http'
require 'json'

uri = URI('wss://bsc.nownodes.io/wss/{apiKey}')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_chainId",
    "params": []
  }'

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": "eth_chainId",
  "params": []
}

{
  "jsonrpc": "2.0",
  "id": 2,
  "result": "0x38"
}

string

Documentation

How to migrate to NOWNodes

Returns the chain id.

Body

Parameters

Response