Preflight a UCP profile in your browser.

A fast structural check with no upload, account or data transfer.

[JSON PROFILE]
      |
      +-- ucp.version ............ [check]
      +-- ucp.services ........... [check]
      +-- ucp.capabilities ....... [check]
      +-- payment_handlers ....... [optional]
      |
      +--> official conformance tests

The local check only reviews a few structural elements. It is neither certification nor a conformance test.

Paste the content of a /.well-known/ucp profile. The check runs locally in your browser and verifies readable JSON and a few structural fields. It does not contact the merchant domain.

LOCAL / JSON / NO UPLOAD

Paste a UCP JSON profile

No data is sent: everything stays in your browser.

What this tool does not certify

This preflight is not a UCP certification. It does not validate composed schemas, signatures, endpoints, capability negotiation or checkout behavior. For normative validation, use the official conformance tests and the official schema validator.

Checklist after the preflight

test the profile against its declared UCP release;
check every schema URL and advertised endpoint;
test negotiation with compatible and incompatible platform profiles;
run the conformance scenarios for every exposed capability.