WorkOS API
Enterprise authentication infrastructure providing SAML SSO, Directory Sync (SCIM), and Admin Portal for B2B SaaS apps to onboard enterprise customers without building it themselves.
Clerk API
Developer-friendly authentication and user management platform with drop-in UI components, a Backend API for user/org management, and first-class Next.js and React support.
Firebase Authentication API
Google Firebase's authentication service supporting email/password, phone, and social logins (Google, Apple, GitHub, etc.) with a backend Admin SDK for user management and token verification.
Magic.link API
Passwordless authentication platform providing magic link (email) and social login, with optional Web3 wallet integration, offering a developer SDK and Admin REST API for user management.
Okta API
Enterprise-grade identity platform providing SSO, MFA, lifecycle management, and API access management for workforce and customer identity use cases.
Auth0 API
Enterprise identity platform providing authentication, authorization, and user management via OAuth2/OIDC with support for social logins, MFA, SSO, and a management API for user/application administration.
SCIM 2.0 Protocol
Open standard protocol (RFC 7644) for automating user provisioning and deprovisioning between identity providers (IdPs like Okta, Azure AD) and SaaS applications using a standardized REST API.