Starts a subscription and pushes notifications.

POST

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

Creates a subscription. Live-tested subscription types on this endpoint: newHeads (a full block header is pushed for every block) and newPendingTransactions (a transaction hash is pushed for every mempool transaction). The reply returns the subscription id; afterwards notifications arrive as {"jsonrpc":"2.0","method":"eth_subscription","params":{"subscription":,"result":}} without a request id. BSC produces blocks sub-second, so notifications are frequent.

Body

application/json

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

jsonrpcstringrequired

idintegerrequired

Request identifier echoed back in the response.

methodstringrequired

paramsArray<string>newHeadsnewPendingTransactionsrequired

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). Example notification for newHeads is stored in the NewHeadsNotification schema (live capture).

403Forbidden

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

Starts a subscription and pushes notifications.

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

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("wss://bsc.nownodes.io/wss/{apiKey}");
const result = await provider.send("eth_subscribe", [
  "newHeads"
]);
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_subscribe",
  "params": [
    "newHeads"
  ],
  "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_subscribe", [
  "newHeads"
])
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_subscribe",
  params: [
  "newHeads"
],
});

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_subscribe", params: [
  "newHeads"
], 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_subscribe",
      "params": [
        "newHeads"
      ]
    }),
});

const data = await response.json();

import requests

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

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_subscribe",
    "params": [
      "newHeads"
    ]
  }'

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_subscribe",
  "params": [
    "newHeads"
  ]
}

{
  "jsonrpc": "2.0",
  "id": 21,
  "result": "0x10c5681e8d01e402227153dbb0e6f4"
}

string

Documentation

How to migrate to NOWNodes

Starts a subscription and pushes notifications.

Body

Parameters

Response