What is UCP? UCP is an open standard that enables AI agents and platforms to complete purchases on any UCP-enabled merchant without custom integrations.
What the demo shows:
Discovery via /.well-known/ucp - how platforms find merchant capabilities Checkout Sessions API - create, update, and complete purchases Toggle "Debug Mode" to see the actual API calls in real-time
What's implemented vs mocked:
- Discovery endpoint with capabilities and payment handlers - Full checkout flow with line items, buyer info, payment selection - Payment processing uses test tokens (no real charges) - In-memory storage (resets on each session)
Links:
Demo: https://ucp-demo.web.app
UCP Spec: https://ucp.dev
Source: https://github.com/hemanth/ucp-demo
Would love feedback on the developer experience. Is the protocol discoverable enough? What's missing?