Find the right API
Use search when the broad directory stops being enough. Filter by category, auth, CORS, signup friction, and result freshness until the shortlist becomes obvious.
Start with category and auth when you know the integration shape. Use free, signup, and CORS flags when you are trying to remove setup friction.
Sort by verification or response time when the final call is about reliability, not just category fit.
3 results after 1 active filters. Remove any one below without losing the rest of the cut.
Amazon Cognito Identity
AWS Cognito Identity Pools API issues temporary AWS credentials to frontend apps — identity federation, guest users, direct AWS resource access.
Amazon Cognito Identity Provider
Amazon Cognito User Pools deliver managed user signup, login, password reset, and MFA for applications.
Clerk API
Clerk API is a modern user authentication service — sign up / sign in, organizations, multi-factor, SSO; optimized for React / Next.js / Remix.