Category
Authentication & Identity APIs pricing
Authentication & Identity APIs handle the hard, security-critical work of signup, login, sessions, MFA, social/passwordless login, and enterprise SSO/SCIM so product teams don't have to. The category splits into incumbents built for enterprise IAM (Okta, and Auth0 which Okta now owns), B2B-enterprise-readiness specialists (WorkOS, Frontegg, Stytch), developer-experience-first drop-ins (Clerk), and auth bundled inside a broader backend-as-a-service (Firebase, Supabase). Compare on documentation/DX quality and quickstart speed, reliability (published SLA, status-page history, proven scale), breadth and quality of official SDKs and framework support, and how fast a developer or AI agent can self-serve a working key. Free-tier generosity now clusters around 50k MAU for the developer-friendly tools, while enterprise-grade SSO is typically priced per connection or gated behind sales.
| API | Billed by | Free tier | Verified |
|---|---|---|---|
 Auth0 Authentication & Identity APIs | MAU-based | Free tier or trial | Jun 27, 2026 |
 Firebase Authentication Authentication & Identity APIs | MAU-based (+ per-SMS) | Free tier or trial | Jun 27, 2026 |
 WorkOS Authentication & Identity APIs | Per connection / MAU-based | Free tier or trial | Jun 27, 2026 |
 Clerk Authentication & Identity APIs | MAU-based | Free tier or trial | Jun 27, 2026 |
 Stytch Authentication & Identity APIs | Usage-based (MAU + connections) | Free tier or trial | Jun 27, 2026 |
 Supabase Auth Authentication & Identity APIs | MAU-based (+ platform fee) | Free tier or trial | Jun 27, 2026 |
 Okta Customer Identity Authentication & Identity APIs | MAU-based (enterprise minimums) | No free tier | Jun 27, 2026 |
 Frontegg Authentication & Identity APIs | MAU-based (+ feature add-ons) | Free tier or trial | Jun 27, 2026 |