Send a signed transaction

POST

https://vinu.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Submits a signed, RLP-encoded transaction to the network and returns its hash.

The only write path on this endpoint. Our nodes hold no keys, so eth_sendTransaction and eth_signTransaction cannot be used - sign on your side and submit the raw bytes here.

Only replay-protected (EIP-155) transactions are accepted. Malformed input is rejected by the RLP decoder before it reaches the pool, e.g. -32000 rlp: value size exceeds available input length.

Changed in the 29 August 2026 network upgrade.

Submission no longer fails after the transaction has been accepted. Previously, if sender recovery failed - which can happen at a fork activation boundary - the call returned an error even though the transaction was already in the pool, inviting a duplicate resend. It now returns the hash.
Pre-EIP-155 (unprotected) transactions remain rejected with only replay-protected (EIP-155) transactions allowed over RPC, with one hard-coded carve-out on mainnet: the canonical Arachnid deterministic-deployer transaction, pinned by exact hash.
EIP-7702 set-code transactions (type 0x4) are accepted. EIP-4844 blob transactions (type 0x3) are still NOT supported and will be rejected.

Body

application/json

jsonrpcstringrequired

JSON-RPC version

methodstringrequired

Method name

paramsArray<string>required

Array containing a single signed transaction data (hex string)

idintegerrequired

Request ID

Response

200OK

Transaction successfully sent

405Method Not Allowed

Method not served by this endpoint. The body is the plain-text string Method Not Allowed, not JSON.

422Unprocessable Entity

Missing API key - the api-key header was absent. The body is the plain-text string Missing API_key, not JSON.

Send a signed transaction

curl -X POST 'https://vinu.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -H 'api-key: YOUR_API_KEY' \
  -d '{"jsonrpc": "2.0", "method": "eth_sendRawTransaction", "params": ["0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"], "id": 1}'

import { FetchRequest, JsonRpcProvider } from "ethers";

const request = new FetchRequest("https://vinu.nownodes.io/");
request.setHeader("api-key", "YOUR_API_KEY");

const provider = new JsonRpcProvider(request);
const result = await provider.send("eth_sendRawTransaction", ["0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"]);
console.log(result);

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

uri = URI('https://vinu.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['api-key'] = 'YOUR_API_KEY'
request.body = '{"jsonrpc": "2.0", "method": "eth_sendRawTransaction", "params": ["0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"], "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://vinu.nownodes.io/",
    request_kwargs={"headers": {"api-key": "YOUR_API_KEY"}},
))

response = w3.provider.make_request("eth_sendRawTransaction", [
    "0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0",
])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://vinu.nownodes.io/", {
    fetchOptions: { headers: { "api-key": "YOUR_API_KEY" } },
  }),
});

const result = await client.request({
  method: "eth_sendRawTransaction",
  params: ["0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"],
});

console.log(result);

const endpoint = "https://vinu.nownodes.io/";
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_sendRawTransaction", params: [
  "0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"
], id: 1 });
console.log(result);

const response = await fetch('https://vinu.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'api-key': 'YOUR_API_KEY',
  },
  body: JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_sendRawTransaction",
    "params": [
      "0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"
    ],
    "id": 1
  }),
});

const data = await response.json();

import requests

payload = {
    "jsonrpc": "2.0",
    "method": "eth_sendRawTransaction",
    "params": [
        "0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0",
    ],
    "id": 1,
}

response = requests.post(
    "https://vinu.nownodes.io/",
    json=payload,
    headers={"api-key": "YOUR_API_KEY"},
)

print(response.json())

require 'net/http'
require 'json'

uri = URI('https://vinu.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['api-key'] = 'YOUR_API_KEY'
request.body = '{"jsonrpc": "2.0", "method": "eth_sendRawTransaction", "params": ["0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"], "id": 1}'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts JSON.parse(response.body)

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_sendRawTransaction",
  "params": [
    "0x02f8730181d2843bbbbf80850a804fa44082520894d008ffcd4b0cd8cafc7a04819fee3dd21e284cdb87b8bdb97852000080c0"
  ],
  "id": 1
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x7f8a08576b8474e17e8311c2732029232892d450bfdc30816ffb133c2f8e3f1a"
}

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

Method Not Allowed

Missing API_key