BroadcastTx

POST

https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Broadcasts a Broadcast Tx request to the cosmos.tx.v1beta1.Service gRPC service and returns the method-specific response.

Full method:

Copied!

cosmos.tx.v1beta1.Service/BroadcastTx

Endpoint: band-grpc.nownodes.io (gRPC, TLS). Pass the API key in the api-key metadata header.

Example:

Copied!

grpcurl \
  -insecure \
  -H 'api-key: YOUR_API_KEY' \
  -d '{"txBytes":"BASE64_SIGNED_TX_BYTES","mode":"BROADCAST_MODE_SYNC"}' \
  'band-grpc.nownodes.io' \
  cosmos.tx.v1beta1.Service/BroadcastTx

Body

application/json

object

Response

200OK

A successful response.

BroadcastTx

curl -X POST 'https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx' \
  -H 'Content-Type: application/json' \
  -d '{
    "txBytes": "BASE64_SIGNED_TX_BYTES",
    "mode": "BROADCAST_MODE_SYNC"
  }'

const response = await fetch('https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "txBytes": "BASE64_SIGNED_TX_BYTES",
      "mode": "BROADCAST_MODE_SYNC"
    }),
});

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "txBytes": "BASE64_SIGNED_TX_BYTES",
    "mode": "BROADCAST_MODE_SYNC"
  }'

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

import requests

payload = {
  "txBytes": "BASE64_SIGNED_TX_BYTES",
  "mode": "BROADCAST_MODE_SYNC"
}

response = requests.post('https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx', json=payload)
data = response.json()

const response = await fetch('https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "txBytes": "BASE64_SIGNED_TX_BYTES",
      "mode": "BROADCAST_MODE_SYNC"
    }),
});

const data = await response.json();

const endpoint = "https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx";
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({
    "txBytes": "BASE64_SIGNED_TX_BYTES",
    "mode": "BROADCAST_MODE_SYNC"
  });
console.log(result);

const response = await fetch('https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "txBytes": "BASE64_SIGNED_TX_BYTES",
      "mode": "BROADCAST_MODE_SYNC"
    }),
});

const data = await response.json();

import requests

payload = {
  "txBytes": "BASE64_SIGNED_TX_BYTES",
  "mode": "BROADCAST_MODE_SYNC"
}

response = requests.post('https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://band-grpc.nownodes.io/cosmos.tx.v1beta1.Service/BroadcastTx')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "txBytes": "BASE64_SIGNED_TX_BYTES",
    "mode": "BROADCAST_MODE_SYNC"
  }'

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

Request Body

{
  "txBytes": "BASE64_SIGNED_TX_BYTES",
  "mode": "BROADCAST_MODE_SYNC"
}

200

{
  "txResponse": {
    "height": "12345678",
    "txhash": "0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF",
    "codespace": "",
    "code": 0,
    "data": "",
    "rawLog": "[]",
    "logs": [],
    "info": "",
    "gasWanted": "200000",
    "gasUsed": "75000",
    "timestamp": "2026-01-01T00:00:00Z",
    "events": []
  }
}