Core SDK

import { TxBuilder } from "@chipi-stack/core"; // ESM
const { TxBuilder } = require("@chipi-stack/core"); // CommonJS

import { Amount, TxBuilder, Erc20, TokenRegistry, createAccount, DirectSigner } from "@chipi-stack/core";
import { ChipiServerSDK } from "@chipi-stack/backend";

// Create signer + account
const signer = new DirectSigner(process.env.PRIVATE_KEY!, myAddress);
const account = await createAccount({
  signer,
  provider: { nodeUrl: "https://starknet-mainnet.infura.io/v3/..." },
});

// Look up USDC from the built-in token registry
const registry = new TokenRegistry("mainnet");
const usdcInfo = registry.bySymbol("USDC")!;

// Parse a human-readable amount safely (no floating point)
const amount = Amount.parse("10.0", usdcInfo);

// Create a typed ERC20 wrapper
const usdc = new Erc20(usdcInfo, account);

// Check balance
const balance = await usdc.balanceOf(myAddress);
console.log(balance.toFormatted()); // "150.5 USDC"

// Gasless: approve + transfer via Chipi's paymaster
const sdk = new ChipiServerSDK({ apiPublicKey: "pk_...", apiSecretKey: "sk_..." });
const paymaster = sdk.createPaymasterAdapter();

const txHash = await new TxBuilder(account, { paymaster })
  .add(usdc.approveCall(spender, amount))
  .add(usdc.transferCall(recipient, amount))
  .sendSponsored(); // gasless!

// Or direct (user pays gas):
const result = await new TxBuilder(account)
  .add(usdc.approveCall(spender, amount))
  .add(usdc.transferCall(recipient, amount))
  .send();