RPC call

POST

wss://optimism-index.nownodes.io/wss/{api_key}

Calls the rpcCall method over a WebSocket connection.

Connection URL:

Copied!

wss://optimism-index.nownodes.io/wss/{{api_key}}

Open the connection, then send the message below as a text frame.

Example:

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wscat -c 'wss://optimism-index.nownodes.io/wss/YOUR_API_KEY'
> {"id":"28","method":"rpcCall","params":{"to":"0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c","data":"0x18160ddd"}}

Passthrough for eth_call: send the contract address in to and the ABI-encoded call in data. The example above calls totalSupply().

Body

application/json

object

Parameters

api_keystringrequiredpath

Your NOWNodes API key.

Response

200OK

A successful response.

RPC call

curl -X POST 'wss://optimism-index.nownodes.io/wss/{api_key}' \
  -H 'Content-Type: application/json' \
  -d '{
    "id": "28",
    "method": "rpcCall",
    "params": {
      "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
      "data": "0x18160ddd"
    }
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("wss://optimism-index.nownodes.io/wss/{api_key}");
const result = await provider.send("rpcCall", {
  "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
  "data": "0x18160ddd"
});
console.log(result);

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

uri = URI('wss://optimism-index.nownodes.io/wss/{api_key}')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "rpcCall",
  "params": {
    "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
    "data": "0x18160ddd"
  },
  "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://optimism-index.nownodes.io/wss/{api_key}"))
response = w3.provider.make_request("rpcCall", {
  "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
  "data": "0x18160ddd"
})
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "rpcCall",
  params: {
  "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
  "data": "0x18160ddd"
},
});

console.log(result);

const endpoint = "wss://optimism-index.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: "rpcCall", params: {
  "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
  "data": "0x18160ddd"
}, id: 1 });
console.log(result);

const response = await fetch('wss://optimism-index.nownodes.io/wss/{api_key}', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "id": "28",
      "method": "rpcCall",
      "params": {
        "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
        "data": "0x18160ddd"
      }
    }),
});

const data = await response.json();

import requests

payload = {
  "id": "28",
  "method": "rpcCall",
  "params": {
    "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
    "data": "0x18160ddd"
  }
}

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

require 'net/http'
require 'json'

uri = URI('wss://optimism-index.nownodes.io/wss/{api_key}')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "id": "28",
    "method": "rpcCall",
    "params": {
      "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
      "data": "0x18160ddd"
    }
  }'

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

Request Body

{
  "id": "28",
  "method": "rpcCall",
  "params": {
    "to": "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
    "data": "0x18160ddd"
  }
}

200

{
  "id": "28",
  "data": {
    "data": "0x0000000000000000000000000000000000000000000175d93a1a9ad4a3420284"
  }
}