UCP Checker
Check a store

Custom & Headless UCP adoption

Stores built on bespoke stacks, headless frontends, or Rails/Django/Node backends.

142Custom & Headless stores publish a valid UCP profile
84 · Baverage UCP Score
2.0capabilities declared per store
486 msaverage profile response

What Custom & Headless stores declare

share of its verified stores
Capabilities
Catalog Search64.8%
Catalog Lookup46.5%
Checkout43.7%
Order Management28.9%
Fulfillment25.4%
Cart25.4%
Discount14.8%
Identity Linking13.4%
Buyer Consent5.6%
Com Ucpchecker Domain Check3.5%
Com Ucpchecker Bulk Check3.5%
Com Ucpchecker Router3.5%
Transports
REST78.9%
MCP47.9%
A2A0.7%
REDIRECT0.7%

Examples

12 of 142, highest UCP Score first
devucp.netsgroup.com UCP Score 100 ticketfairy.com UCP Score 100 assistant-experiments.vercel.app UCP Score 100 c73071f29621970e.finqustore.dev UCP Score 99 acs-exploration.vercel.app UCP Score 99 book.hugocatarino.com UCP Score 99 vtex-ucp-adapter.vercel.app UCP Score 99 jrqxx1a5.finqustore.dev UCP Score 96 food.ucpsandbox.com UCP Score 96 eshop.andyhoang.me UCP Score 96 scvd.store UCP Score 96 protherapysupplies.com UCP Score 96

The leaderboard ranks every Custom & Headless store; each has its own status page.

About Custom & Headless

Custom stores have the most flexibility in UCP implementation — they typically publish profiles directly from their API gateway and often expose the deepest capability surface.

Check a Custom & Headless store
See what a UCP agent finds there. It gets its own status page.
Check a store

Questions

How many Custom & Headless stores support UCP?
142 Custom & Headless stores we check publish a valid UCP profile. The examples above are the ones with the highest UCP Score; the leaderboard ranks them all.
How do I publish a UCP profile on Custom & Headless?
Serve a valid JSON document at /.well-known/ucp on your store's own domain. Depending on your stack that is a custom app, a platform feature where one exists, or the endpoint proxied through your CDN. Then check the store: its status page shows what an agent finds.
Can I add my Custom & Headless store to UCP Checker?
Yes. Check your domain. A store with a valid UCP profile at /.well-known/ucp is counted on this page. No signup, no fee.

Explore protocol data