JS
This page describes how to build and send Solana transactions using JS
HTTP
const axios = require('axios');
const web3 = require('@solana/web3.js');
const bs58 = require('bs58');
// ------------------ Configuration Constants ------------------
// BlockRazor relay endpoint address
const httpEndpoint = "http://frankfurt.solana.blockrazor.xyz:443/sendTransaction";
const healthEndpoint = "http://frankfurt.solana.blockrazor.xyz:443/health";
// Replace with your Solana RPC endpoint
const mainNetRPC = "";
// Replace with your authKey
const authKey = "";
// Replace with your private key (base58)
const privateKey = "";
// Replace with your target public key
const publicKey = "";
// Send mode
const mode = "fast";
// Transaction amount
const amount = 200_000;
// Tip amount
const tipAmount = 1000000;
const tipAccounts = [
"Gywj98ophM7GmkDdaWs4isqZnDdFCW7B46TXmKfvyqSm",
"FjmZZrFvhnqqb9ThCuMVnENaM3JGVuGWNyCAxRJcFpg9",
"6No2i3aawzHsjtThw81iq1EXPJN6rh8eSJCLaYZfKDTG",
"A9cWowVAiHe9pJfKAj3TJiN9VpbzMUq6E4kEvf5mUT22",
"68Pwb4jS7eZATjDfhmTXgRJjCiZmw1L7Huy4HNpnxJ3o",
"4ABhJh5rZPjv63RBJBuyWzBK3g9gWMUQdTZP2kiW31V9",
"B2M4NG5eyZp5SBQrSdtemzk5TqVuaWGQnowGaCBt8GyM",
"5jA59cXMKQqZAVdtopv8q3yyw9SYfiE3vUCbt7p8MfVf",
"5YktoWygr1Bp9wiS1xtMtUki1PeYuuzuCF98tqwYxf61",
"295Avbam4qGShBYK7E9H5Ldew4B3WyJGmgmXfiWdeeyV",
"EDi4rSy2LZgKJX74mbLTFk4mxoTgT6F7HxxzG2HBAFyK",
"BnGKHAC386n4Qmv9xtpBVbRaUTKixjBe3oagkPFKtoy6",
"Dd7K2Fp7AtoN8xCghKDRmyqr5U169t48Tw5fEd3wT9mq",
"AP6qExwrbRgBAVaehg4b5xHENX815sMabtBzUzVB4v8S",
];
// ------------------ Axios HTTP Client (Connection Reuse Enabled) ------------------
const httpClient = axios.create({
timeout: 10000,
headers: {
'Content-Type': 'application/json',
'apikey': authKey,
},
httpAgent: new (require('http').Agent)({ keepAlive: true }),
httpsAgent: new (require('https').Agent)({ keepAlive: true }),
});
// ------------------ Periodic Health Ping to Keep Connection Alive ------------------
async function pingHealth() {
try {
const res = await httpClient.get(healthEndpoint);
console.log(`Health result:`, res.data);
} catch (err) {
console.error('Health check failed:', err.message);
}
}
// ------------------ Build and Send Transaction ------------------
async function sendTx() {
const senderPrivateKey = new Uint8Array(bs58.decode(privateKey));
const senderKeypair = web3.Keypair.fromSecretKey(senderPrivateKey);
const receiver = new web3.PublicKey(publicKey);
const tipAccount = new web3.PublicKey(tipAccounts[Math.floor(Math.random() * tipAccounts.length)]);
const connection = new web3.Connection(mainNetRPC);
const { blockhash } = await connection.getLatestBlockhash('finalized');
const tx = new web3.Transaction()
.add(web3.SystemProgram.transfer({
fromPubkey: senderKeypair.publicKey,
toPubkey: tipAccount,
lamports: tipAmount,
}))
.add(web3.SystemProgram.transfer({
fromPubkey: senderKeypair.publicKey,
toPubkey: receiver,
lamports: amount,
}));
tx.recentBlockhash = blockhash;
tx.feePayer = senderKeypair.publicKey;
tx.sign(senderKeypair);
const serialized = tx.serialize();
const base64Tx = serialized.toString('base64');
const payload = {
transaction: base64Tx,
mode: mode,
};
try {
const res = await httpClient.post(httpEndpoint, payload);
console.log('[send tx] response:', res.data);
} catch (err) {
console.error('SendTx failed:', err.response?.data || err.message);
}
}
// ------------------ Main Entry ------------------
(async () => {
// Initial health check (establish connection)
await pingHealth();
// Periodically send /health to keep connection alive
setInterval(pingHealth, 30 * 1000);
sendTx().catch(console.error);
})();Response Example
Success
{"signature":"2DkHpsZxwbGDHkCujRMqd1jXMPaXfzn2JpwxZ43PoTk6Cj7hpxDp8VHESNCeuh95nVMmsWV4RGGWCkmGERZCTWHL","error":""}Error
{"signature":"","error":"error: Authentication information is missing. Please provide a valid auth token"}gRPC
const web3 = require("@solana/web3.js");
const bs58 = require("bs58");
const grpc = require('@grpc/grpc-js');
const protoLoader = require('@grpc/proto-loader');
const PROTO_PATH = __dirname + '/server.proto';
const packageDefinition = protoLoader.loadSync(
PROTO_PATH,
{
keepCase: true,
longs: String,
enums: String,
defaults: true,
oneofs: true
}
);
const serverProto = grpc.loadPackageDefinition(packageDefinition).serverpb;
// BlockRazor relay endpoint address
const blzRelayEndpoint = "frankfurt.solana-grpc.blockrazor.xyz:80";
// replace your solana rpc endpoint
const mainNetRPC = "";
// replace your authKey
const authKey = "";
// relace your private key(base58)
const privateKey = "";
// send mode
const mode = "fast"; // set to "sandwichMitigation" to mitigate sandwich attacks on tx
// safeWindow
const safeWindow = 3; // only take effect in sandwichMitigation mode
// tip amount
const tipAmount = 1000000;
const tipAccounts = [
"FjmZZrFvhnqqb9ThCuMVnENaM3JGVuGWNyCAxRJcFpg9",
"6No2i3aawzHsjtThw81iq1EXPJN6rh8eSJCLaYZfKDTG",
"A9cWowVAiHe9pJfKAj3TJiN9VpbzMUq6E4kEvf5mUT22",
"Gywj98ophM7GmkDdaWs4isqZnDdFCW7B46TXmKfvyqSm",
"68Pwb4jS7eZATjDfhmTXgRJjCiZmw1L7Huy4HNpnxJ3o",
"4ABhJh5rZPjv63RBJBuyWzBK3g9gWMUQdTZP2kiW31V9",
"B2M4NG5eyZp5SBQrSdtemzk5TqVuaWGQnowGaCBt8GyM",
"5jA59cXMKQqZAVdtopv8q3yyw9SYfiE3vUCbt7p8MfVf",
"5YktoWygr1Bp9wiS1xtMtUki1PeYuuzuCF98tqwYxf61",
"295Avbam4qGShBYK7E9H5Ldew4B3WyJGmgmXfiWdeeyV",
"EDi4rSy2LZgKJX74mbLTFk4mxoTgT6F7HxxzG2HBAFyK",
"BnGKHAC386n4Qmv9xtpBVbRaUTKixjBe3oagkPFKtoy6",
"Dd7K2Fp7AtoN8xCghKDRmyqr5U169t48Tw5fEd3wT9mq",
"AP6qExwrbRgBAVaehg4b5xHENX815sMabtBzUzVB4v8S",
];
function getRandomAccount() {
const randomIndex = Math.floor(Math.random() * tipAccounts.length);
return tipAccounts[randomIndex];
}
(async () => {
const client = new serverProto.Server(
blzRelayEndpoint,
grpc.credentials.createInsecure()
);
var meta = new grpc.Metadata();
meta.add('apikey', authKey);
client.getHealth({}, meta, (err, response) => {
if (err) {
console.error('[get health] error:', err);
return;
}
console.log('[get health] response:', response);
});
const senderPrivateKey = new Uint8Array(bs58.decode(privateKey));
const senderKeypair = web3.Keypair.fromSecretKey(senderPrivateKey);
const tipAccount = getRandomAccount();
const recipientPublicKey = new web3.PublicKey(tipAccount);
const transaction = new web3.Transaction().add(
web3.SystemProgram.transfer({
fromPubkey: senderKeypair.publicKey,
toPubkey: recipientPublicKey,
lamports: tipAmount,
})
);
const connection = new web3.Connection(mainNetRPC);
transaction.recentBlockhash = (await connection.getLatestBlockhash()).blockhash;
transaction.feePayer = senderKeypair.publicKey;
transaction.sign(senderKeypair);
const serializedTransaction = transaction.serialize();
const base64Tx = serializedTransaction.toString('base64');
client.SendTransaction({transaction: base64Tx, mode:mode, safeWindow:safeWindow}, meta, (err, response) => {
if (err) {
console.error('[send tx] error:', err);
return;
}
console.log('[send tx] response:', response);
});
})();Proto
syntax = "proto3";
package serverpb;
option go_package = "./pb/serverpb";
service Server {
rpc SendTransaction(SendRequest) returns(SendResponse) {};
rpc GetHealth(HealthRequest) returns(HealthResponse) {};
}
message SendRequest {
string transaction = 1;
string mode = 2;
int32 safeWindow = 3; // only take effect in sandwichMitigation mode
bool revertProtection = 4;
}
message SendResponse {
string signature = 1;
}
message HealthRequest {
}
message HealthResponse {
string status = 1;
}Response Example
Success
[send tx] response: {signature: '3WbpmLkpgKC13XTFZDUCvjvC3uo5KincG3DTEgjWerQi1B1Frf4zwkDsEtnxBVqW3EgD1b38YWsTKAyFonRR6xSM'}Error
[send tx] error: Error: 2 UNKNOWN: Insufficient tip, please increase the tip amount and try again, at least 1000000 lamportsLast updated