Addresses, amount conversion, allowance/vault calldata, UsdcPass transfer verification, and relayer helpers used by the Autlantic Billing stack. Relayer helpers are for gas sponsorship and transaction submission; they are not used to custody USDC balances.

Install

npm install @autlantic/chain-evm

Most integrators only need @autlantic/payments-recurring. Use this package directly when you need lower-level Base / USDC utilities.

UsdcPass (one-time transfer)

For a single USDC payment (no vault mandate):

import {
  chainConfigFor,
  encodeTransferCalldata,
  usdcToMicro,
  verifyUsdcPassPaymentFromTxHash,
  type UsdcPassPaymentIntent,
} from "@autlantic/chain-evm";

const chainId = 84532; // Base Sepolia
const chain = chainConfigFor(chainId);
const payoutAddress = "0x…";
const amountUsdc = 49;

const intent: UsdcPassPaymentIntent = {
  chainId,
  usdcAddress: chain.usdcAddress,
  payoutAddress,
  expectedAmountUsdc: amountUsdc,
};

const transferCalldata = encodeTransferCalldata(payoutAddress, usdcToMicro(amountUsdc));
// Wallet sends { to: usdcAddress, data: transferCalldata }, then:
const result = await verifyUsdcPassPaymentFromTxHash(intent, txHash);

Hosted Autlantic checkout (POST /v1/payments → /checkout/pay/:id) uses the same verification path. See One-time payments.

Docs

• Product: autlantic.com
• Docs: docs.autlantic.com
• Source: github.com/autlantic/payments-sdk

License

MIT © Autlantic