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Withdraw from Earn Vault

Withdraw your vault shares to receive the underlying tokens plus accrued interest.
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Import Dependencies

Import the required packages for Solana RPC communication, Kamino SDK operations, and Kit transaction building.
import {
  createSolanaRpc,
  createSolanaRpcSubscriptions,
  address,
  pipe,
  createTransactionMessage,
  setTransactionMessageFeePayerSigner,
  setTransactionMessageLifetimeUsingBlockhash,
  appendTransactionMessageInstructions,
  signTransactionMessageWithSigners,
  sendAndConfirmTransactionFactory,
  getSignatureFromTransaction,
} from '@solana/kit';
import { KaminoVault } from '@kamino-finance/klend-sdk';
import { parseKeypairFile } from '@kamino-finance/klend-sdk/dist/utils/signer.js';
import { Decimal } from 'decimal.js';
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Load Signer and Initialize Vault

Load your keypair from a file and initialize RPC connections and the vault instance.
const KEYPAIR_FILE = '/path/to/your/keypair.json';
const signer = await parseKeypairFile(KEYPAIR_FILE);

const rpc = createSolanaRpc('https://api.mainnet-beta.solana.com');
const rpcSubscriptions = createSolanaRpcSubscriptions('wss://api.mainnet-beta.solana.com');
const vault = new KaminoVault(
  rpc,
  address('HDsayqAsDWy3QvANGqh2yNraqcD8Fnjgh73Mhb3WRS5E')
);
Replace /path/to/your/keypair.json with the actual path to your keypair file. The rpcSubscriptions enables real-time transaction confirmation.
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Build Withdraw Instructions

Generate withdraw instructions including optional unstaking instructions.
const withdrawAmount = new Decimal(1.0);
const bundle = await vault.withdrawIxs(signer, withdrawAmount);
const instructions = [...(bundle.unstakeFromFarmIfNeededIxs || []), ...(bundle.withdrawIxs || [])];

if (!instructions.length) {
  throw new Error('No instructions returned by Kamino SDK');
}
The withdrawIxs method returns both unstaking and withdraw instructions. The amount represents vault shares to redeem, not the underlying token amount.
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Build and Sign Transaction

Use Kit’s functional pipe pattern to build and sign the transaction with a fresh blockhash.
const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();

const transactionMessage = pipe(
  createTransactionMessage({ version: 0 }),
  (tx) => setTransactionMessageFeePayerSigner(signer, tx),
  (tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
  (tx) => appendTransactionMessageInstructions(instructions, tx)
);

const signedTransaction = await signTransactionMessageWithSigners(transactionMessage);
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Send and Confirm Transaction

Send the withdraw transaction and wait for confirmation.
const signature = getSignatureFromTransaction(signedTransaction);

await sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions })(signedTransaction, {
  commitment: 'confirmed',
  skipPreflight: true,
});

console.log('Withdraw successful! Signature:', signature);
Once the withdraw transaction is confirmed, your vault shares are burned and you receive the underlying tokens plus any accrued interest.