Two thirds of the registry ships only as an installable package. Nothing is installed to check one: the package registry's own document says whether the package exists and whether the exact version an entry declares is published. These are the entries where it does not.
149 records across 119 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.