import { Connection, PublicKey } from '@solana/web3.js';

async function checkMainnet() {
    const connection = new Connection('https://api.mainnet-beta.solana.com', 'confirmed');
    const pubkey = new PublicKey("HvfSWWepPGnb1JSAuqEogq3mTvm9pTXKQZD4WKFCHKYe");
    const bal = await connection.getBalance(pubkey);
    console.log("Mainnet Balance:", bal / 1e9);
}
checkMainnet().catch(console.log);