Broadcast a raw transaction using the path.

GET

https://kmdbook.nownodes.io/api/v2/sendtx/{hex}

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Modified in 0.6.0: the broadcast payload size is limited, an alternative broadcast provider can be configured server-side, and requests are rate-limited per client. Write operation: the success scenario is not executed intentionally; the invalid-hex validation error is live-verified ("-22: TX decode failed"). 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 (invalid hex): HTTP 400 {"error":"-22: TX decode failed"}. Success scenario not executed intentionally.

Parameters

hexstringrequiredpath

Raw transaction.

Response

200OK

HTTP 200 Komodo 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://kmdbook.nownodes.io/api/v2/sendtx/{hex}'

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

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://kmdbook.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://kmdbook.nownodes.io/api/v2/sendtx/{hex}')
data = response.json()

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

const data = await response.json();

const endpoint = "https://kmdbook.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://kmdbook.nownodes.io/api/v2/sendtx/{hex}', {
  method: 'GET',
});

const data = await response.json();

import requests

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

require 'net/http'
require 'json'

uri = URI('https://kmdbook.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": "c1e5c301b467ba98e0588e376fac027e4f3a6a91e4291f3a9b711a6028312fe8"
}

{
  "error": "-22: TX decode failed"
}

{
  "error": "-22: TX decode failed"
}

Unknown API_key

Method Not Allowed

{
  "error": "Internal server error"
}