Sending Transactions

Use this endpoint to send a single transaction faster than the p2p network using the BDN.

REQUEST

Method: blxr_tx

Parameters

Parameter	Description	Instructions & Notes
transaction	Raw transactions bytes without 0x prefix.	Mandatory. Learn more about constructing the transaction here.
blockchain_network	Blockchain network name.	Optional. Default: Mainnet Available options are: Mainnet for ETH Mainnet, BSC-Mainnet for BSC Mainnet *Use with Cloud-API when working with BSC.
fall_back	The duration of time (in ms) that your transaction will be delayed before propagation by the BDN as a normal transaction	Available only when using next_validator Default: 0 If the value is 0, the transaction will never be propagated by the BDN as a normal transaction.
node_validation	Transaction is sent to the blockchain node for validation, and the Gateway returns any error message received in response.	Available only with Gateway API Optional Default: False

Cloud-API

• The WebSocket endpoint for sending transactions is wss://api.blxrbdn.com/ws . All users sending transactions via a WebSocket connection should use this endpoint.

• See Cloud-API IPs to work directly with IP ( wss://<IP>/ws)

• The HTTPS POST endpoint is https://api.blxrbdn.com .

Sending transactions via WebSocket instead of HTTPS can lead to a latency improvement of up to 10ms.

Examples

wscat WS

# ETH Example
wscat -c wss://api.blxrbdn.com/ws --header "Authorization: <YOUR-AUTHORIZATION-HEADER>"
> {"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params":
   {"transaction": "f86b0184...e0b58219"}}
< ......

# BSC Example
wscat -c wss://api.blxrbdn.com/ws --header "Authorization: <YOUR-AUTHORIZATION-HEADER>"
> {"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": 
  {"transaction": "f86b0184...e0b58219",
   "blockchain_network": "BSC-Mainnet"}}
< ....

Node.js WS

const WebSocket = require('ws');

const ws = new WebSocket(
  "wss://api.blxrbdn.com/ws", 
  {
    headers: { 
      "Authorization" : <YOUR-AUTHORIZATION-HEADER>  
    },
    rejectUnauthorized: false,
  }
);

function proceed() {
    // ETH Example
    ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219"}}`);
    // BSC Example
    // ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219", "blockchain_network": "BSC-Mainnet"}}`);
    //
    // or use a variable for the transaction string:
    // rawTx = "f86b0184...e0b58219";
    // ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "${rawTx}"}}`);
}


function handle(response) {
    console.log(response.toString()); // or process it generally
}

ws.on('open', proceed);
ws.on('message', handle);

Python WS

# Python 3.7 or higher required due to the use of asyncio.run()
import asyncio, json, ssl
from websocket import create_connection

async def main():
    try:
        ws = create_connection('wss://api.blxrbdn.com/ws',
                               header=["Authorization:{}".format("YOUR_AUTHORIZATION_HEADER")],
                               sslopt={"cert_reqs": ssl.CERT_NONE})
        # ETH Example
        request = json.dumps({"id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219"}})
        
        # BSC Example
        request = json.dumps({"id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219", "blockchain_network": "BSC-Mainnet"}})
        
        ws.send(str(request))
        while True:
            response = json.loads(ws.recv())
            print(response) # or process it generally
    except Exception as e:
        print(f'Connection failed, Reason: {e}')


if __name__ == '__main__':
    asyncio.run(main()

golang WS

package main

import (
	"crypto/tls"
	"fmt"
	"github.com/gorilla/websocket"
	"net/http"
)

func main() {
	tlsConfig := &tls.Config{
		InsecureSkipVerify: true,
	}
	dialer := websocket.DefaultDialer
	dialer.TLSClientConfig = tlsConfig
	wsSubscriber, _, err := dialer.Dial("wss://api.blxrbdn.com/ws", http.Header{"Authorization": []string{<YOUR-AUTHORIZATION-HEADER>}})

	if err != nil {
		fmt.Println(err)
		return
	}

        // ETH Example
	request := `{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219"}}`
        // BSC Example
        // request := `{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219", "blockchain_network": "BSC-Mainnet"}}`
	err = wsSubscriber.WriteMessage(websocket.TextMessage, []byte(request))
	if err != nil {
		fmt.Println(err)
		return
	}

	_, response, err := wsSubscriber.ReadMessage()
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(string(response)) // or process it generally
}

HTTPS POST

# ETH Example
curl https://api.blxrbdn.com \
    -X POST \
    -H "Content-Type: application/json" \
    -H "Authorization: <YOUR-AUTHORIZATION-HEADER>" \
    -d '{"method": "blxr_tx", "id": "1", "params": {"transaction": "f86b0184...e0b58219"}}'

# BSC Example
curl https://api.blxrbdn.com \
    -X POST \
    -H "Content-Type: application/json" \
    -H "Authorization: <YOUR-AUTHORIZATION-HEADER>" \
    -d '{"method": "blxr_tx", "id": "1", "params": {"transaction": "f86b0184...e0b58219", 
         "blockchain_network": "BSC-Mainnet"}}'

Gateway-API:

• Gateway WebSocket endpoint: ws://127.0.0.1:28333/ws

• We assume the WebSocket port 28333.

• Please check Authorization Headers examples to reconstruct the header.

Examples

wscat

# ETH Example
wscat -c ws://127.0.0.1:28333/ws --header "Authorization: <YOUR-AUTHORIZATION-HEADER>"
> {"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params":
   {"transaction": "f86b0184...e0b58219"}}
< ......

# BSC Example
wscat -c ws://127.0.0.1:28333/ws --header "Authorization: <YOUR-AUTHORIZATION-HEADER>"
> {"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": 
  {"transaction": "f86b0184...e0b58219",
   "blockchain_network": "BSC-Mainnet"}}
< ......

Node.js

const WebSocket = require('ws');

const ws = new WebSocket(
  "ws://127.0.0.1:28333/ws", 
  {
    headers: { 
      "Authorization" : <YOUR-AUTHORIZATION-HEADER>
    },
    rejectUnauthorized: false,
  }
);

function proceed() {
    // ETH Example
    ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219"}}`);
    // BSC Example
    // ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219", "blockchain_network": "BSC-Mainnet"}}`);
    //
    // or use a variable for the transaction string:
    // rawTx = "f86b0184...e0b58219";
    // ws.send(`{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "${rawTx}"}}`);
}


function handle(response) {
    console.log(response.toString()); // or process it generally
}

ws.on('open', proceed);
ws.on('message', handle);

Python

# Python 3.7 or higher required due to the use of asyncio.run()
import asyncio, json, ssl
from websocket import create_connection

async def main():
    try:
        ws = create_connection('ws://127.0.0.1:28333/ws',
                               header=["Authorization:{}".format("YOUR_AUTHORIZATION_HEADER")],
                               sslopt={"cert_reqs": ssl.CERT_NONE})
        # ETH Example
        request = json.dumps({"id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219"}})
        
        # BSC Example
        request = json.dumps({"id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219", "blockchain_network": "BSC-Mainnet"}})
        
        ws.send(str(request))
        while True:
            response = json.loads(ws.recv())
            print(response) # or process it generally
    except Exception as e:
        print(f'Connection failed, Reason: {e}')

golang

package main

import (
	"crypto/tls"
	"fmt"
	"github.com/gorilla/websocket"
	"net/http"
)

func main() {
	tlsConfig := &tls.Config{
		InsecureSkipVerify: true,
	}
	dialer := websocket.DefaultDialer
	dialer.TLSClientConfig = tlsConfig
	wsSubscriber, _, err := dialer.Dial("ws://127.0.0.1:28333/ws", http.Header{"Authorization": []string{<YOUR-AUTHORIZATION-HEADER>}})

	if err != nil {
		fmt.Println(err)
		return
	}

  // ETH Example
	request := `{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219"}}`
  // BSC Example
  // request := `{"jsonrpc": "2.0", "id": 1, "method": "blxr_tx", "params": {"transaction": "f86b0184...e0b58219", "blockchain_network": "BSC-Mainnet"}}`
	err = wsSubscriber.WriteMessage(websocket.TextMessage, []byte(request))
	if err != nil {
		fmt.Println(err)
		return
	}

	_, response, err := wsSubscriber.ReadMessage()
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(string(response)) // or process it generally
}

RESPONSE

Result Fields

Result Field	Description
tx_hash	Transaction hash

Examples

Response

{
    "jsonrpc": "2.0", 
    "id": "1", 
    "result": {
        "tx_hash": "ffd59870844e5...bfa54a69"
    }
}    

Example - gRPC

Gateway-API

package main

import (
	"context"
	"fmt"
	"time"
	
	pb "github.com/bloXroute-Labs/bxgateway-private-go/bxgateway/v2/protobuf"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
)

func main() {
	// gRPC server default values
	gatewayHostIP := "127.0.0.1"
	gatewayGRPCPort := 5001
	
	// this will use localhost CA to verify the certificate
	creds := credentials.NewClientTLSFromCert(nil, "")

	// Open gRPC connection to Gateway.
	conn, _ := grpc.Dial(
		fmt.Sprintf("%v:%v", gatewayHostIP, gatewayGRPCPort), 
		grpc.WithTransportCredentials(creds),
	)

	// Use the Gateway client connection interface. 
	client := pb.NewGatewayClient(conn)
	
	// create context and defer cancel of context
	callContext, cancel := context.WithTimeout(context.Background(), 24*time.Hour)
	defer cancel()
	
	// send tx
	reply, err := client.BlxrTx(callContext, &pb.BlxrTxRequest{AuthHeader: "<YOUR-AUTHORIZATION-HEADER>", Transaction: "f86b0184...e0b58219"})
	if err != nil {
		print(err)
		return
	}
	
	txHash := reply.TxHash
	print(txHash) // or process it generally
}

NOTES

All Users

Sending Transactions to the Cloud-API or Gateway-API requires you to register an account on the bloXroute portal. During the registration process, a certificate, private key, and secret hash will be generated for your account. The certificate and key will be used to authenticate your account.

The bloXroute best practice is for users to send transactions to both the Gateway-API and to their blockchain node. You should send transactions in parallel to the Gateway and to your blockchain node as a backup.

Users should not send transactions to the transactions streams WebSocket endpoint wss://<REGION>.<NETWORK>.blxrbdn.com/ws(e.g.wss://virginia.eth.blxrbdn.com/ws) which is for streaming only and doesn't support sending transactions.