The host an operation's own document declares as its server, checked by DNS and a TLS handshake on 2026-09-10 - no HTTP request, no path touched. This is the failure that looks like nothing until the call.
370 records across 200 subjects, observed 2026-09-10. Every one carries a check you can run in a single request.
All subjects ยท the whole registry, machine-readable
This is not a list of good APIs or bad ones. It is a list of observations, each dated and each disprovable in one request. Absence from it means an operation was not examined, not that it is fine.