vokko.eu / report / mastercard.com

mastercard.com

Origin-owner checklist from missing spec fields. Not a login. Not a grade letter.

presence 2026-09-01T14:17:05.321Z · callability 2026-09-01T15:08:30.070Z · live re-run is €29/mo

6 items an origin owner can fix without completing checkout.

ucp · ucp.missing
No machine UCP profile at /.well-known/ucp.
Publish JSON with a YYYY-MM-DD version, services, capabilities, and payment_handlers.
https://ucp.dev
mpp · mpp.missing
No WWW-Authenticate: Payment challenge on the observed GETs.
If you speak MPP, challenge with WWW-Authenticate: Payment. There is no public /.well-known/mpp.
https://docs.stripe.com
mcp · mcp.missing
No MCP manifest JSON.
Publish /.well-known/mcp.json (or /.well-known/mcp) as JSON naming the server endpoint.
https://modelcontextprotocol.io
a2a · a2a.missing
No A2A agent card.
Publish /.well-known/agent-card.json (preferred) or /.well-known/agent.json with name and skills.
https://a2a-protocol.org
llms · llms.missing
No /llms.txt map.
Publish /llms.txt describing machine-readable entry points.
https://llmstxt.org
openapi · openapi.missing
No OpenAPI document at the usual paths.
Publish /openapi.json (or /.well-known/openapi.json) if you have an HTTP API.
https://www.openapis.org