Broadcast a raw transaction using the request body.

POST

https://btcbook.nownodes.io/api/v2/sendtx

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Broadcasts hex-encoded raw transaction data from the request body. The trailing slash is mandatory in the Blockbook handler. POST bodies are limited to 8 MiB.

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

Body

text/plain

Broadcasts hex-encoded raw transaction data from the request body. The trailing slash is mandatory in the Blockbook handler. POST bodies are limited to 8 MiB.

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

text/plainstring

Alternative schema variant for this parameter or payload.

string

application/jsonobject

Alternative schema variant for this parameter or payload.

object

Response

200OK

Broadcast result.

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

default

Public API error.

Broadcast a raw transaction using the request body.

curl -X POST 'https://btcbook.nownodes.io/api/v2/sendtx/' \
  -H 'Content-Type: text/plain' \
  -d '"0x00"'

const response = await fetch('https://btcbook.nownodes.io/api/v2/sendtx/', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
  },
  body: JSON.stringify("0x00"),
});

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://btcbook.nownodes.io/api/v2/sendtx/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'text/plain'
request.body = '"0x00"'

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

import requests

payload = "0x00"

response = requests.post('https://btcbook.nownodes.io/api/v2/sendtx/', json=payload)
data = response.json()

const response = await fetch('https://btcbook.nownodes.io/api/v2/sendtx/', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
  },
  body: JSON.stringify("0x00"),
});

const data = await response.json();

const endpoint = "https://btcbook.nownodes.io/api/v2/sendtx/";
const apiKey = "YOUR_API_KEY";

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

  return response.json();
}

const result = await nownodesRequest("0x00");
console.log(result);

const response = await fetch('https://btcbook.nownodes.io/api/v2/sendtx/', {
  method: 'POST',
  headers: {
    'Content-Type': 'text/plain',
  },
  body: JSON.stringify("0x00"),
});

const data = await response.json();

import requests

payload = "0x00"

response = requests.post('https://btcbook.nownodes.io/api/v2/sendtx/', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://btcbook.nownodes.io/api/v2/sendtx/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'text/plain'
request.body = '"0x00"'

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

Request Body

0x00

{}

{
  "result": "7c3be24063f268aaa1ed81b64776798f56088757641a34fb156c4f51ed2e9d25"
}

Unknown API_key

Method Not Allowed

Missing API_key

{
  "result": "7c3be24063f268aaa1ed81b64776798f56088757641a34fb156c4f51ed2e9d25"
}

{
  "error": "Invalid transaction hex"
}