Earn Deposit with the API

import {
  createSolanaRpc,
  createSolanaRpcSubscriptions,
  pipe,
  getTransactionDecoder,
  getCompiledTransactionMessageDecoder,
  decompileTransactionMessageFetchingLookupTables,
  setTransactionMessageFeePayerSigner,
  setTransactionMessageLifetimeUsingBlockhash,
  addSignersToTransactionMessage,
  signTransactionMessageWithSigners,
  sendAndConfirmTransactionFactory,
  getSignatureFromTransaction,
} from '@solana/kit';
import { parseKeypairFile } from '@kamino-finance/klend-sdk/dist/utils/signer.js';

const KEYPAIR_FILE = '/path/to/your/keypair.json';
const API_BASE_URL = 'https://api.kamino.finance';

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 response = await fetch(`${API_BASE_URL}/ktx/kvault/deposit`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    wallet: signer.address,
    kvault: 'HDsayqAsDWy3QvANGqh2yNraqcD8Fnjgh73Mhb3WRS5E',
    amount: '1.0',
  }),
});

if (!response.ok) {
  const error = await response.json();
  throw new Error(`API error: ${error.message}`);
}

const { transaction: encodedTransaction } = await response.json();

const txBuffer = Buffer.from(encodedTransaction, 'base64');
const txMessageBytes = getTransactionDecoder().decode(txBuffer).messageBytes;

const compiledMessage = getCompiledTransactionMessageDecoder().decode(txMessageBytes);

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

const signedTransaction = await pipe(
  await decompileTransactionMessageFetchingLookupTables(compiledMessage, rpc),
  (tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
  (tx) => setTransactionMessageFeePayerSigner(signer, tx),
  (tx) => addSignersToTransactionMessage([signer], tx),
  (tx) => signTransactionMessageWithSigners(tx)
);

const signature = getSignatureFromTransaction(signedTransaction);

console.log(`Sending transaction with signature: ${signature}`);

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

console.log('Deposit successful! Signature:', signature);