Jeevachaithanyan Sivanandan

UCP Ready Ecommerce

In AI · 3 min read

GitHub Repo : https://github.com/jeevanism/ucp-ready-ecom

Well, there is another buzzword coming as ‘UCP’, something resonant with the MCP; it’s not far from the concepts of MCP but integrating the vibe of E-commerce into it.

The Universal Commerce Protocol (UCP) is an open-source standard designed to enable “agentic commerce.” It serves as a universal language that allows AI agents (like Google Gemini or ChatGPT) to interact directly with online stores to discover products, build carts, and complete transactions autonomously. For a better understanding, lets quote google, the official developer of this protocol

The Universal Commerce Protocol (UCP) is an open-source standard designed to power the next generation of agentic commerce. By establishing a common language and functional primitives, UCP enables seamless commerce journeys between consumer surfaces, businesses, and payment providers. It is built to work with existing retail infrastructure, and is compatible with Agent Payments Protocol (AP2) to provide secure agentic payments support. It also provides businesses flexible ways to integrate via APIs, Agent2Agent (A2A), and the Model Context Protocol (MCP).

So, I built the UCP-Ready E-commerce blueprint: a full-stack reference that translates the documentation into runnable code.

TechStack

FastAPI backend

  • /.well-known/ucp exposes the capability contract.
  • /products serves a YAML-backed catalog.
  • Checkout sessions support POST create, PATCH update, POST :quote, and POST :complete, all requiring Idempotency-Key + Agent-Id.
  • Deterministic idempotency registry and per-agent rate limiting mirror the spec’s “agent-safe defaults.”

MCP sidecar

  • Mirrors the REST actions as tools.
  • Typer CLI + examples/mcp_flow.py let agents or developers exercise the flow without writing HTTP clients, keeping schemas aligned between REST/MCP.

React UI

  • TanStack Query keeps catalog, discovery capabilities, and a checkout session control panel in sync with the backend.
  • Humans can create/update/quote/complete sessions and see line items/subtotals, proving the same deterministic API works for both operators and agents.

Demo scripts

  • examples/rest_flow.sh runs discovery → create → update → quote → complete via curl, so you can watch the entire agent flow from a terminal.
  • MCP script does the same via the sidecar.
  • Docs live in docs/overview.md and docs/ucp-implementation-map.md, explaining setup and endpoints.

How can you use it

  • Checkout the FastAPI reference that can clone, run tests (make test), and extend—no guessing about idempotency or rate limits.
  • Agent/tool builders can use the MCP CLI or REST scripts to validate deterministic retries and error schemas.
  • Product & ops teams can run the React UI, monitor sessions, and showcase agent/human parity.

In short, this project turns the UCP spec into a practical, demo-first codebase. Clone it, run the scripts, play with the UI, and use it as a template for your own agent-native storefronts.

Built With

Reference

- https://developers.google.com/merchant/ucp
- https://ucp.dev/latest/
- https://github.com/Universal-Commerce-Protocol/ucp