Get ETH Balance of an Address

POST

https://trx.nownodes.io/jsonrpc

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

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

Request value.

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

JSON-RPC method name

paramsArray<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)

idintegerrequired

Request ID

Response

200OK

HTTP 200 response for eth_getBalance. The body contains either a successful result or a node-level error.

400Bad Request

Bad Request. The request is malformed or contains invalid parameters.

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

Internal Server Error. The gateway or node failed while processing the request.

Get ETH Balance of an Address

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

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://trx.nownodes.io/jsonrpc");
const result = await provider.send("eth_getBalance", [
  "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
  "latest"
]);
console.log(result);

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

uri = URI('https://trx.nownodes.io/jsonrpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "eth_getBalance",
  "params": [
    "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
    "latest"
  ],
  "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://trx.nownodes.io/jsonrpc"))
response = w3.provider.make_request("eth_getBalance", [
  "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
  "latest"
])
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "eth_getBalance",
  params: [
  "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
  "latest"
],
});

console.log(result);

const endpoint = "https://trx.nownodes.io/jsonrpc";
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_getBalance", params: [
  "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
  "latest"
], id: 1 });
console.log(result);

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

const data = await response.json();

import requests

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

response = requests.post('https://trx.nownodes.io/jsonrpc', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://trx.nownodes.io/jsonrpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": [
      "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
      "latest"
    ],
    "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_getBalance",
  "params": [
    "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
    "latest"
  ],
  "id": 1
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x0"
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32602,
    "message": "invalid argument 0: invalid parameter for eth_getBalance"
  }
}

{
  "code": 400,
  "message": "Bad Request"
}

Unknown API_key

Method Not Allowed

Missing API_key

{
  "code": 500,
  "message": "Internal Server Error"
}

Documentation

How to migrate to NOWNodes

Get ETH Balance of an Address

Authorizations

Body

Response