Build the USDT Checkout Widget

Ship a plug-and-play checkout widget that lets stores accept USDT on Tron and Base. Customer pays in USDT, we auto-convert to local currency and ping our backend via webhook. Stripe, but for USDT. Objective: Build a frontend widget + backend that enables USDT payments with real-time conversion to local currency Requirements: *Frontend:* Embeddable via `<script>` or React. Takes local currency amount, converts to USDT live, supports Tron + Base USDT, generates QR code + wallet address, shows status: pending/confirmed/failed. Backend/Webhook: Listens for on-chain USDT confirmation on Tron and Base, converts to local currency using a live rate API, fires webhook with tx hash, amount paid, local amount, status, order ID. Retries on failure. Dev Experience: Clear README with setup and embed steps, demo page, works on desktop + mobile. *Tech stack:* Open. http://Ethers.js, TronWeb, Node, http://Next.js, Python, etc.