transfer.js

import {
    Connection,
    Transaction,
    SystemProgram,
    sendAndConfirmTransaction,
    PublicKey,
    clusterApiUrl,
} from '@solana/web3.js';
import 'dotenv/config';
import { getKeypairFromEnvironment } from '@solana-developers/helpers';

const suppliedToPubkey = process.argv[2] || null;

if (!suppliedToPubkey) {
    console.log(`Please provide a public key to send to`);
    process.exit(1);
}

const senderKeypair = getKeypairFromEnvironment('SECRET_KEY');
console.log('Send from :' + senderKeypair.publicKey);
console.log(`suppliedToPubkey: ${suppliedToPubkey}`);

const toPubkey = new PublicKey(suppliedToPubkey);

const connection = new Connection(clusterApiUrl('devnet'), 'confirmed');

console.log(`✅ Loaded our own keypair, the destination public key, and connected to Solana`);

const transaction = new Transaction();

const LAMPORTS_TO_SEND = 5000;

const sendSolInstruction = SystemProgram.transfer({
    fromPubkey: senderKeypair.publicKey,
    toPubkey,
    lamports: LAMPORTS_TO_SEND,
});

transaction.add(sendSolInstruction);

const signature = await sendAndConfirmTransaction(connection, transaction, [senderKeypair]);

console.log(`💸 Finished! Sent ${LAMPORTS_TO_SEND} to the address ${toPubkey}. `);
console.log(`Transaction signature is ${signature}!`);