Universal Commerce Protocol (UCP) Samples

This directory contains sample implementations and client scripts for the Universal Commerce Protocol (UCP).

Sample Implementations

REST (Python) - Start Here

A reference implementation of a UCP Merchant Server using Python and FastAPI.

👉 Get Started with the REST Tutorial

• Server: Located in rest/server/

  • Demonstrates capability discovery, checkout session management, payment processing, and order lifecycle.
  • Includes simulation endpoints for testing.

• Client: Located in rest/client/

  • Happy Path Script - A script demonstrating a full "happy path" user journey (discovery -> checkout -> payment).

A2A (Coming Soon)

A reference implementation using Agent 2 Agent (A2A) protocol.

• Located in a2a/
• Status: Implementation in progress