Earn Deposit from Privy Wallet

Deposit to Kamino Earn vaults using Privy embedded wallets. This integration allows users to deposit without managing their own private keys.

Earn Deposit from Privy

Import Dependencies

Import the required packages for Privy client, Solana RPC communication, and Kamino SDK operations.

import { PrivyClient } from '@privy-io/node';
import {
  createSolanaRpc,
  address,
  pipe,
  createTransactionMessage,
  setTransactionMessageFeePayerSigner,
  setTransactionMessageLifetimeUsingBlockhash,
  appendTransactionMessageInstructions,
  createNoopSigner,
  getBase64EncodedWireTransaction,
  compileTransaction,
} from '@solana/kit';
import { KaminoVault } from '@kamino-finance/klend-sdk';
import { Decimal } from 'decimal.js';

Configure Privy and Initialize Client

Set up your Privy credentials and initialize the Privy client and RPC connection.

const PRIVY_APP_ID = 'put-your-privy-app-id-here';
const PRIVY_APP_SECRET = 'put-your-privy-app-secret-here';
const RPC_ENDPOINT = 'https://api.mainnet-beta.solana.com';
const VAULT_ADDRESS = 'HDsayqAsDWy3QvANGqh2yNraqcD8Fnjgh73Mhb3WRS5E'; // Steakhouse USDC Vault
const AUTH_KEY_ID = 'put-your-auth-key-id-here';
const AUTH_KEY_PRIVATE = 'put-your-auth-key-private-here';
const USER_EMAIL = 'put-your-email-here';

const privy = new PrivyClient({
  appId: PRIVY_APP_ID,
  appSecret: PRIVY_APP_SECRET,
});

const rpc = createSolanaRpc(RPC_ENDPOINT);

Update the configuration values with your Privy app credentials and user details. This example uses the Steakhouse USDC Vault.

Create Privy User and Wallet

Create a Privy user account and generate an embedded Solana wallet.

await privy.users().create({
  linked_accounts: [{ type: 'email', address: USER_EMAIL }]
});

const { id: walletId, address: walletAddress } = await privy.wallets().create({
  chain_type: 'solana',
  owner_id: AUTH_KEY_ID
});

Before proceeding, fund the wallet with SOL (for transaction fees) and USDC (for deposit). The wallet cannot submit transactions without sufficient funds.

Build Deposit Instructions

Initialize the vault and generate deposit instructions using a noop signer.

const vault = new KaminoVault(rpc, address(VAULT_ADDRESS));
await vault.getState();

const noopSigner = createNoopSigner(address(walletAddress));
const bundle = await vault.depositIxs(noopSigner, new Decimal(1.0));
const instructions = [
  ...(bundle.depositIxs || []),
];

if (!instructions.length) throw new Error('No instructions returned');

A noop signer is used to build instructions without requiring the actual private key. Privy will handle signing later.

Build Transaction Message

Fetch the latest blockhash and construct the transaction message.

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

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

Sign Transaction with Privy

Compile the transaction, serialize it, and sign using Privy’s wallet API.

const compiledTransaction = compileTransaction(depositTransactionMessage);
const serializedTx = getBase64EncodedWireTransaction(compiledTransaction);

const signResponse = await privy.wallets().solana().signTransaction(walletId, {
  transaction: serializedTx,
  authorization_context: {
    authorization_private_keys: [AUTH_KEY_PRIVATE]
  }
});

Privy handles the signing securely using the embedded wallet. The private key never leaves Privy’s infrastructure.

Send Transaction

Submit the signed transaction to the Solana network.

const signature = await rpc.sendTransaction(signResponse.signed_transaction as any, {
  encoding: 'base64',
  skipPreflight: true,
}).send();

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

Your deposit is complete! The user’s funds are now deposited in the Kamino Earn vault using their Privy embedded wallet.

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