UWAPI

It is a Web3 checkout and invoicing interface that enables users to pay merchants using any supported crypto asset, while merchants receive stablecoin settlements (in USDC). Users are divided into merchants and consumers; the merchants can generate invoices and subscriptions, and users can pay using the most cost-efficient token automatically, without manual swaps or pricing calculations. The result is a single unified crypto payment surface compatible with real-world pricing systems.

UWAPI was built as a unified multi-chain checkout stack using Uniswap, Flare, WalletConnect, and ENS. The backend orchestrates payments, fetching swap quotes via Uniswap and verifying real-time USD pricing with Flare FTSO and FSD. Merchants always receive USDC settlements, while invoices and subscriptions are stored immutably on Flare Coston2 using Solidity smart contracts. WalletConnect enables wallet-agnostic checkout, and ENS links readable merchant identities. A lightweight subscription executor automates recurring payments by regenerating invoices and committing them on-chain. These components form a seamless Web3 payment surface combining speed, stability, and multi-chain liquidity.