Auth & API Security – Public APIs Directory

About Auth & API Security

Identity providers and security platforms with clear rate-limit and quota policies for tokens/requests.

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Auth & API Security

Auth0 — OAuth/OIDC with rate-limit guidance
Okta — Identity APIs with quotas
Firebase Auth — Google-backed identity APIs
Clerk — User mgmt & sessions
Stytch — Passwordless; fair-use limits
Ory — Open-source identity stack
Keycloak — OSS IdP for OAuth/OIDC
FusionAuth — Developer-friendly IdP
Descope — Auth flows with quotas
SuperTokens — Session management OSS
Cloudflare Turnstile — Bot mitigation without CAPTCHAs
reCAPTCHA Enterprise — Protect APIs from abuse
AWS WAF (Rate-based) — Rate-based rules for throttling