const { sol } = await getBalance('YOUR_WALLET_ADDRESS');
console.log(`Balance: ${sol} SOL`);

{
  address: string;   // The wallet address
  lamports: number;  // Balance in lamports (1 SOL = 1B lamports)
  sol: number;       // Balance in SOL
}

const { blockhash } = await getBlockhash();
// Use this blockhash when building your transaction

{
  blockhash: string;           // Current blockhash
  lastValidBlockHeight: number; // Block height until this hash is valid
}

const info = await getAccountInfo('YOUR_WALLET_ADDRESS');
if (info.exists) {
  console.log(`Owner: ${info.owner}`);
}

{
  address: string;      // The account address
  exists: boolean;      // Does the account exist?
  owner?: string;       // Program that owns this account
  lamports?: number;    // Balance in lamports
  executable?: boolean; // Is this a program account?
  dataLength?: number;  // Size of account data in bytes
}