Build with BlockSprint

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

async function sendWithBlockSprintRPC(transaction, wallet, apiKey) {
  // Add tip instruction (at beginning for priority)
  const tipInstruction = SystemProgram.transfer({
    fromPubkey: wallet.publicKey,
    toPubkey: new PublicKey('SpripkmSKaQbSVvhYM9x4dFfXV2ULXucEsgbEjnLTtf'),
    lamports: 100000 // 0.0001 SOL minimum tip
  });
  
  transaction.add(tipInstruction);
  transaction.sign(wallet);
  
  // Submit via BlockSprint RPC Proxy
  const endpoint = 'https://ny.blocksprint.io/'; // Choose closest endpoint
  const response = await fetch(`${endpoint}?api_key=${apiKey}`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      jsonrpc: '2.0',
      method: 'sendTransaction',
      params: [transaction.serialize().toString('base64')],
      id: 1
    })
  });
  
  const result = await response.json();
  console.log('Transaction signature:', result.result);
  return result;
}