UCP Checker

The Universal Commerce Protocol (UCP) is an open standard, co-developed by Google, Shopify, Amazon, Walmart, Stripe and others, that lets AI shopping agents discover what a store supports without a custom integration for each agent. A compliant business publishes a JSON manifest at /.well-known/ucp listing its services (how agents connect: REST, MCP or A2A, with an endpoint), the capabilities it exposes (like checkout or catalog search), and any payment_handlers.

This tool fetches that file and checks its shape against the published UCP schema: that it parses as JSON, that ucp.version, ucp.services and ucp.capabilities are present, and that each service and capability entry has the fields UCP requires (version, spec, and endpoint or schema depending on the transport).

• It only validates the manifest's structure, it can't act as an agent and call your checkout or catalog endpoints, since those need an agent's own signed credentials.
• A missing file isn't an error on your part if you haven't adopted UCP yet: it's still an early-stage, opt-in standard.

Use the UCP Profile Generator to build the JSON file, then see its guide for how to host it on Shopify or WooCommerce, since both need a small workaround to serve a file at a /.well-known/ path.