Burn and Close Solana SPL Tokens SDK

A lightweight Solana SDK to burn SPL tokens and close token accounts with a fixed 5% protocol fee. This library only builds unsigned transactions – you handle signing and sending them, whether in the browser (Wallet Adapter) or server (Keypair).

✨ Features

• 🔥 Burn all tokens in provided ATAs.
• 🧹 Close token accounts, reclaiming rent to the user.
• 💸 Automatic 5% protocol fee (hardcoded in program).
• ⚡ Automatic batching (default 12 ATAs per transaction).
• 🪙 Supports SPL Token and Token-2022.
• 🔐 Supports frontend partial signing and backend full signing workflows.
• 🚀 No hidden config: single function to integrate.

🧩 How It Works

1. The SDK prepares TransactionInstructions for your on-chain burn+close program.
2. Program burns tokens in each ATA, then closes it, sending rent back to the owner.
3. A 5% fee is enforced on-chain and sent to the hardcoded recipient.
4. The SDK never asks for private keys — you sign & send transactions yourself.

📦 Installation

npm i @unclaimedsol/spl-burn-close-sdk

We use @solana/web3.js in peerDependencies to avoid version conflicts, so make sure you already have it installed.

Requires Node 18+.

🔑 Usage

Signing with Keypair

import { Connection, Keypair, PublicKey } from "@solana/web3.js";
import {
  buildBurnAndCloseTransactions,
  PROGRAM_ID,
} from "@unclaimedsol/spl-burn-close-sdk";

const connection = new Connection("https://api.mainnet-beta.solana.com");
const keypair = Keypair.fromSecretKey(/* Uint8Array */);
const user = keypair.publicKey;

// You can get easily obtain pairs using getTokenAccountsByOwner method
const pairs = [{ mint: new PublicKey("MINT_1"), ata: new PublicKey("ATA_1") }];

const txs = await buildBurnAndCloseTransactions(
  connection,
  PROGRAM_ID,
  user,
  pairs
);

for (const tx of txs) {
  tx.partialSign(keypair);
  const sig = await connection.sendRawTransaction(tx.serialize());
  let latestBlockhash = await connection.getLatestBlockhash(
    connection.commitment
  );
  await connection.confirmTransaction({
    signature: sig,
    blockhash: latestBlockhash.blockhash,
    lastValidBlockHeight: latestBlockhash.lastValidBlockHeight,
  });
  console.log("✅ Sent:", sig);
}

Signing with Wallet Adapter

import { Connection, PublicKey } from "@solana/web3.js";
import {
  buildBurnAndCloseTransactions,
  PROGRAM_ID,
  TOKEN_2022_PROGRAM_ID,
} from "@unclaimedsol/spl-burn-close-sdk";

const connection = new Connection("https://api.mainnet-beta.solana.com");
const user = wallet.publicKey; // Wallet Adapter

// You can get easily obtain pairs using getTokenAccountsByOwner method
const pairs = [
  { mint: new PublicKey("MINT_1"), ata: new PublicKey("ATA_1") },
  { mint: new PublicKey("MINT_2"), ata: new PublicKey("ATA_2") },
];

const txs = await buildBurnAndCloseTransactions(
  connection,
  PROGRAM_ID,
  user,
  pairs
);

// For Token-2022 accounts, pass TOKEN_2022_PROGRAM_ID and consider using a smaller chunkSize:
// const txs = await buildBurnAndCloseTransactions(
//   connection,
//   PROGRAM_ID,
//   user,
//   pairs,
//   { chunkSize: 2 },
//   TOKEN_2022_PROGRAM_ID
// );

// Sign
const signed = wallet.signAllTransactions
  ? await wallet.signAllTransactions(txs)
  : await Promise.all(txs.map((t) => wallet.signTransaction!(t)));

// Send
for (const stx of signed) {
  const sig = await connection.sendRawTransaction(stx.serialize());
  let latestBlockhash = await connection.getLatestBlockhash(
    connection.commitment
  );
  await connection.confirmTransaction({
    signature: sig,
    blockhash: latestBlockhash.blockhash,
    lastValidBlockHeight: latestBlockhash.lastValidBlockHeight,
  });
  console.log("✅ Sent:", sig);
}

🌐 Cluster support

This SDK targets the Unclaimed SOL mainnet program (PROGRAM_ID) and fee recipient (FEE_RECIPIENT). Transactions will only succeed on a cluster where that program is deployed.

💻 Demo

There is a nice tutorial guide with a demo repository that shows the usage of the SDK to burn and close all token accounts for the wallet. You can find it here.

📜 Disclaimer

This SDK only builds transactions to burn tokens and close accounts. You are solely responsible for signing and sending them. We are not liable for any loss of funds.

📃 License

MIT © Unclaimed SOL