API DIRECTORY · BUILD AND SHIP

Authentication & Identity

23 companies and tools in this category. Each listing links to the provider’s own website. Search the full directory

Auth0Hosted APIFree option
Identity platform
Set up API access Docs Pricing Status Details
Official source checked · checked 2026-10-23
AuthentikSelf-hosted
Self-hosted identity
Open documentation Pricing Status Details
Official source checked · checked 2026-10-23Install and run this software to expose its API.
CheckrHosted API
Background checks
Open documentation Pricing Status — No status page listedDetails
Official source checked · checked 2026-10-27
ClerkHosted APIFree option
Application identity
Get an API key Docs Pricing Status Details
Official source checked · checked 2026-10-23
Cloudflare TurnstileHosted API
Bot protection without puzzles
Open documentation Pricing Status — No status page listedDetails
Official source checked · checked 2026-10-27
DescopeHosted API
Authentication workflows
Open documentation Pricing Status — No status page listedDetails
Official source checked · checked 2026-10-23
DuoHosted API
Multi-factor authentication
Open documentation Pricing Status Details
Official source checked · checked 2026-10-27
Firebase AuthHosted API
App auth
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official source checked · checked 2026-10-23
FusionAuthHosted API
Identity platform
Set up API access Docs Pricing Status Details
Official source checked · checked 2026-10-23
Google reCAPTCHAHosted API
Bot and abuse protection for forms
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official source checked · checked 2026-10-27
hCaptchaHosted API
Privacy-focused bot protection
Open documentation Pricing Status — No status page listedDetails
Official source checked · checked 2026-10-27
JumioPartner access
Identity verification (KYC)
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official source checked · checked 2026-10-23Provider approval or a commercial agreement may be required.
KeycloakSelf-hosted
Self-hosted identity
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official source checked · checked 2026-10-23Install and run this software to expose its API.
Microsoft Entra IDHosted API
Identity (Graph API)
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official source checked · checked 2026-10-23
OktaHosted API
Identity management
Open documentation Pricing Status Details
Official source checked · checked 2026-10-23
OneLoginHosted API
Identity services
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official documentation checked · checked 2026-10-23
OnfidoPartner access
Identity verification (KYC)
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official source checked · checked 2026-10-23Provider approval or a commercial agreement may be required.
Ory KratosSelf-hostedOpen source · Apache-2.0
Headless cloud-native authentication and identity management written in Go.
Open documentation Pricing — No pricing page listedStatus — No status page listedSource code Details
Official source checked · checked 2026-11-10
PersonaHosted API
Identity verification (KYC)
Open documentation Pricing — No pricing page listedStatus — No status page listedDetails
Official source checked · checked 2026-10-23
StytchHosted API
Authentication services
Open documentation Pricing Status Details
Official source checked · checked 2026-10-23
Supabase AuthHosted API
App auth
Open documentation Pricing Status Details
Official source checked · checked 2026-10-23
SuperTokensSelf-hostedOpen source · Apache-2.0
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
Open documentation Pricing — No pricing page listedStatus — No status page listedSource code Details
Official source checked · checked 2026-11-10The repository README applies Apache-2.0 outside the ee/ directory; ee/ has its own license.
WorkOSHosted API
Enterprise identity
Set up API access Docs Pricing Status Details
Official source checked · checked 2026-10-23