Quickstart

npm install @faremeter/payment-solana @faremeter/fetch @faremeter/info @solana/web3.js

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

// Load keypair from file
const keypairData = JSON.parse(fs.readFileSync("./payer-wallet.json", "utf-8"));
const keypair = Keypair.fromSecretKey(Uint8Array.from(keypairData));

const network = "mainnet-beta";
const connection = new Connection("https://api.mainnet-beta.solana.com");

// Get USDC mint address
const usdcInfo = lookupKnownSPLToken(network, "USDC");
const usdcMint = new PublicKey(usdcInfo.address);

// Create wallet interface
const wallet = {
  network,
  publicKey: keypair.publicKey,
  updateTransaction: async (tx: VersionedTransaction) => {
    tx.sign([keypair]);
    return tx;
  },
};

// Create payment handler and wrap fetch
const handler = createPaymentHandler(wallet, usdcMint, connection);
const fetchWithPayer = wrapFetch(fetch, {
  handlers: [handler],
});

// Make a paid API request
const response = await fetchWithPayer("https://helius.api.corbits.dev", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    jsonrpc: "2.0",
    id: 1,
    method: "getBlockHeight",
  }),
});

const data = await response.json();
console.log(data);