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Universal Commerce Protocol: Open standard for agentic commerce interoperability
- czmilo 9mo agoUCP solves the N-to-N integration problem in commerce by providing a single open standard that enables AI platforms, businesses, and payment providers to interoperate without custom integrations. Built on REST, JSON-RPC, MCP, and A2A protocols, UCP standardizes checkout, order management, and payment processing APIs. The protocol uses a capability-based architecture where businesses publish their supported features at `/.well-known/ucp`, and platforms negotiate capabilities automatically during request/response flows. Core capabilities include checkout sessions (`dev.ucp.shopping.checkout`), order lifecycle management (`dev.ucp.shopping.order`), and OAuth 2.0-based identity linking. Co-developed by Google, Shopify, Etsy, Wayfair, Target, and Walmart, with support from 60+ organizations including Stripe, PayPal, and Visa. Transport-agnostic design supports REST APIs, MCP for LLM integration, and A2A for agent-to-agent communication. The article covers architecture, core capabilities, extensions, payment architecture, and integration patterns. Includes code examples and implementation details.
- ChrisArchitect 9mo agoOfficial post: https://blog.google/products/ads-commerce/agentic-commerce-ai-tools-protocol-retailers-platforms/ https://blog.google/products/ads-commerce/agentic-commerce-a... (https://news.ycombinator.com/item?id=46581509 https://news.ycombinator.com/item?id=46581509)
- nolpak14 9mo agoNice to see an open standard for this instead of proprietary integrations. Made a validator at ucptools.dev to help with implementation - checks the full spec compliance and tells you exactly what to fix. The /.well-known/ucp pattern is smart - same discovery mechanism as security.txt, apple-app-site-association, etc.