Abstract Transaction Fees

import {
  VersionedTransaction,
  TransactionMessage,
  SystemProgram,
  PublicKey,
  Connection,
  LAMPORTS_PER_SOL,
} from "@solana/web3.js";

const connection = new Connection("https://api.mainnet-beta.solana.com");

// Create transaction instructions (example: SOL transfer)
const transferInstruction = SystemProgram.transfer({
  fromPubkey: senderPublicKey,
  toPubkey: recipientPublicKey,
  lamports: 0.1 * LAMPORTS_PER_SOL,
});

// Get recent blockhash and build transaction message
const { blockhash } = await connection.getLatestBlockhash();
const messageV0 = new TransactionMessage({
  payerKey: senderPublicKey,
  recentBlockhash: blockhash,
  instructions: [transferInstruction],
}).compileToV0Message();

// Create versioned transaction (unsigned)
const transaction = new VersionedTransaction(messageV0);

// Serialize to base64
const serializedTransaction = Buffer.from(
  transaction.serialize()
).toString("base64");

const response = await fetch(
  "https://grid.squads.xyz/api/v0/grid/transactions/eoa/gas-abstraction",
  {
    method: "POST",
    headers: {
      Authorization: "Bearer YOUR_API_KEY",
      "X-Grid-Environment": "production", // or 'sandbox' for devnet
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      transaction: serializedTransaction,
    }),
  }
);

const result = await response.json();

// Review fee information
console.log(`Fee: ${result.fee.amount_decimal} ${result.fee.currency}`);
console.log(
  `SOL equivalent: ${result.fee.sol_equivalent.amount_decimal} SOL`
);

import { VersionedTransaction } from "@solana/web3.js";

// Decode the paymaster-signed transaction
const signedTransactionBuffer = Buffer.from(result.transaction, "base64");
const transaction = VersionedTransaction.deserialize(
  signedTransactionBuffer
);

// Add user's signature
transaction.sign([userKeypair]);

// Submit to blockchain
const signature = await connection.sendTransaction(transaction);
console.log("Transaction signature:", signature);

// Confirm transaction
const confirmation = await connection.confirmTransaction(signature);
console.log(
  "Status:",
  confirmation.value.err ? "Failed" : "Confirmed"
);