API registry / Securex
Securex
Securex runs a public Azure API Management developer portal at https://securexacc-portal-api.securex.eu/. Anonymously it lists one API, 'Hello' (a test API for API-management features); the production APIs and their definitions appear only after sign-in with credentials from a Securex contact. No public spec, so none is indexed.
Securex publishes no machine-readable API spec.