Auth & Security APIs
Sign-in, user management and breach data. 3 listed: 0 completely free, 0 usable without an API key.
Auth0 Management API
Users, roles, connections and tenant settings for Auth0.
Clerk Backend API
Users, sessions and organizations for apps using Clerk.
Have I Been Pwned API
Check accounts against breaches; the Pwned Passwords range API is free.
Comparing auth & security APIs
| API | Auth | Pricing model | Docs |
|---|---|---|---|
| Auth0 Management API | OAuth | Free tier | auth0.com |
| Clerk Backend API | API key | Free tier | clerk.com |
| Have I Been Pwned API | API key | Paid | haveibeenpwned.com |
Not sure which to pick? Read our 12-point API checklist and guide to API pricing models.