corbits.ts

import { wrap as wrapFetch } from "@faremeter/fetch";
import { Keypair, PublicKey, Connection } from "@solana/web3.js";
import { createLocalWallet } from "@faremeter/wallet-solana";
import { exact } from "@faremeter/payment-solana";
import * as fs from "fs";

(async function main() {
  const keypair = Keypair.fromSecretKey(
    Uint8Array.from(JSON.parse(fs.readFileSync(process.env.SOL_KEY_PATH!, "utf-8"))),
  );
  const connection = new Connection(process.env.RPC_URL!);

  // Create wallet from keypair
  const wallet = await createLocalWallet("solana", keypair);

  // USDC mint address on Solana mainnet
  const mint = new PublicKey("EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v");

  const fetchWithPayer = wrapFetch(fetch, {
    handlers: [exact.createPaymentHandler(wallet, mint, connection
    )]
  });

  const paywalledRpcUrl = "https://helius.api.corbits.dev";

  const response = await fetchWithPayer(paywalledRpcUrl, {
    method: "POST",
    body: JSON.stringify({ jsonrpc: "2.0", id: 1, method: "getBlockHeight" })
  });
})()