@solana/kit

Build the transaction message with kit's functional pipeline, sign and send through Wallet Standard.

@solana/kit is the next-gen modular Solana SDK. butr owns the wallet; kit owns the functional message builder; the wallet's Wallet Standard features own signing.

Get the signer and read state

import { address, createSolanaRpc, type Address } from "@solana/kit";

const rpc = createSolanaRpc("https://api.devnet.solana.com");
const walletStd = (await wallet.connector.getSigner()) as WalletStandardWallet;

const addr: Address = address(wallet.account.walletAddress);
const { value } = await rpc.getBalance(addr).send();
const sol = `${Number(value) / 1_000_000_000} SOL`;

Build and send a transaction

Build the message with kit's pipe(), compile to a wire transaction, and hand the bytes to solana:signAndSendTransaction:

import {
  appendTransactionMessageInstruction,
  compileTransaction,
  createTransactionMessage,
  getBase64EncodedWireTransaction,
  pipe,
  setTransactionMessageFeePayer,
  setTransactionMessageLifetimeUsingBlockhash,
} from "@solana/kit";

const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();

const message = pipe(
  createTransactionMessage({ version: 0 }),
  (m) => setTransactionMessageFeePayer(addr, m),
  (m) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, m),
  (m) => appendTransactionMessageInstruction(transferIx, m),
);

const compiled = compileTransaction(message);
const wire = getBase64EncodedWireTransaction(compiled);
const bytes = base64ToBytes(wire);

const feature = walletStd.features["solana:signAndSendTransaction"];
if (!feature) throw new Error("Wallet does not advertise solana:signAndSendTransaction");
const account = walletStd.accounts[0];
const [output] = await feature.signAndSendTransaction({
  account,
  chain: "solana:devnet",
  transaction: bytes,
});

Message signing uses solana:signMessage exactly as in the @solana/web3.js integration.

The demo hand-rolls the System Program transfer instruction (a 12-byte buffer: u32 variant 2 + u64 lamports) rather than depending on @solana-program/system, whose codec imports drift between @solana/kit versions. Either approach works.

Source: apps/demo-with-solana-kit/src/app.tsx in the butr repository. Targets Solana devnet. Run pnpm dev --filter=demo-with-solana-kit → http://localhost:5179.

Get the signer and read state

Build and send a transaction

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