Solana: Fast Send Transaction v1 & v2 via BlockRazor

import {
  Connection,
  Transaction,
  SystemProgram,
  PublicKey,
  Keypair,
  LAMPORTS_PER_SOL,
} from '@solana/web3.js';

// Connect to the BlockRazor Solana Fast endpoint
const connection = new Connection('https://fast.blockrazor.io/solana', {
  httpHeaders: { Authorization: 'Bearer YOUR_AUTH_TOKEN' },
});

// Build a transaction that includes a tip instruction to BlockRazor's tip address
const tipAddress = new PublicKey('BLOCKRAZOR_TIP_ADDRESS');
const payer = Keypair.fromSecretKey(YOUR_SECRET_KEY);

const transaction = new Transaction().add(
  // Your primary instruction(s) here
  SystemProgram.transfer({
    fromPubkey: payer.publicKey,
    toPubkey: new PublicKey(RECIPIENT_ADDRESS),
    lamports: 0.01 * LAMPORTS_PER_SOL,
  }),
  // Tip instruction — required for Fast mode
  SystemProgram.transfer({
    fromPubkey: payer.publicKey,
    toPubkey: tipAddress,
    lamports: TIP_AMOUNT_LAMPORTS,
  })
);

const { blockhash } = await connection.getLatestBlockhash();
transaction.recentBlockhash = blockhash;
transaction.feePayer = payer.publicKey;
transaction.sign(payer);

// Submit via BlockRazor Fast mode
const signature = await connection.sendRawTransaction(transaction.serialize(), {
  skipPreflight: true,
});

console.log('Transaction signature:', signature);