Skip to main content
Using our SWQoS, you can use default priority fees (no need to set them specifically), using tips as the priority option. When constructing transactions, you need to add a tip transfer instruction to the transaction to speed up inclusion in blocks. The base64-encoded tx data generated by the example code can be directly called through SDK methods, for example passed to send_transaction. 
const ixs = {your instructions ixs};
const keypair = {your_actual_keypair};
const TIP_AMOUNT = 1_000_000; // 0.001 SOL;
const BLOCKRUSH_TIP = new PublicKey("AhMVT9KWLGjBbzvdqQkTt4vHwpawnGNoGSqaqXYftNDR");

// Append Tip payment instruction
ixs.push(
    SystemProgram.transfer({
        fromPubkey: keypair.publicKey,
        toPubkey: BLOCKRUSH_TIP,
        lamports: TIP_AMOUNT,
    }),
);

// Compile and sign transaction instructions
const messageV0 = new TransactionMessage({
    payerKey: keypair.publicKey,
    recentBlockhash: latestBlockhash.blockhash,
    instructions: ixs,
}).compileToV0Message();
const transaction = new VersionedTransaction(messageV0);
transaction.sign([keypair]);

// Get Base64 encoded string of fully signed transaction
const transactionRaw = Buffer.from(transaction.serialize()).toString('base64');