Broadcast a raw transaction using the path.

GET

https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Modified between 0.5.0 and 0.6.0: request-size hardening limits the broadcast body size (PR #1434); the backend can relay broadcasts through an alternative (e.g. private/MEV) provider (PR #1264); per-client REST rate limiting (PRs #1563/#1590). Documented as it exists in 0.6.0.

Broadcasts hex-encoded raw transaction data. Prefer POST for large payloads.

Load estimate: High; validates and forwards to the backend, with cost growing with transaction size and backend mempool policy checks.

live-verified behavior:

Write operation. Live-validated scenario (payload without 0x prefix): HTTP 400 EVM-flavored error (hexutil.Bytes). Success scenario not executed intentionally.

Parameters

hexstringrequiredpath

Raw transaction.

Response

200OK

HTTP 200 EthereumPoW Blockbook response for sendTransactionByGet.

400Bad Request

Domain or validation error. live-verified: JSON body {"error": "..."} (unknown block/transaction, invalid address, malformed broadcast hex, missing filter parameters).

401Unauthorized

Unauthorized: missing or invalid api-key header. The NOWNodes gateway returns the plain-text body "Unknown API_key".

405Method Not Allowed

Method Not Allowed: gateway-level response for unknown routes (and for the v1 GET broadcast route on this instance).

500Internal Server Error

Internal Server Error. live-verified on the deployed instance: JSON body {"error":"Internal server error"} (observed on /api/rawtx and invalid XPUB lookups).

Broadcast a raw transaction using the path.

curl -X GET 'https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}'

const response = await fetch('https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}', {
  method: 'GET',
});

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}')
request = Net::HTTP::Get.new(uri)

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

import requests

response = requests.get('https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}')
data = response.json()

const response = await fetch('https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}', {
  method: 'GET',
});

const data = await response.json();

const endpoint = "https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}";
const apiKey = "YOUR_API_KEY";

async function nownodesRequest(payload) {
  const response = await fetch(endpoint, {
    method: "GET",
    headers: {
      "Content-Type": "application/json",
      "api-key": apiKey,
    },
    body: JSON.stringify(payload),
  });

  return response.json();
}

const result = await nownodesRequest({});
console.log(result);

const response = await fetch('https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}', {
  method: 'GET',
});

const data = await response.json();

import requests

response = requests.get('https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}')
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://ethw-blockbook.nownodes.io/api/v2/sendtx/{hex}')
request = Net::HTTP::Get.new(uri)

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

{
  "result": "0x50d3707505359f058224bc76e998e8f98abba12b4618441adf0a0f06997b267e"
}

{
  "error": "invalid argument 0: json: cannot unmarshal hex string without 0x prefix into Go value of type hexutil.Bytes"
}

{
  "error": "invalid argument 0: json: cannot unmarshal hex string without 0x prefix into Go value of type hexutil.Bytes"
}

Unknown API_key

Method Not Allowed

{
  "error": "Internal server error"
}