Machine-readable authentication API discovery

Find authentication APIs.

Discover APIs for user sign-in, sessions, tokens, MFA, SSO, passkeys, enterprise identity and machine-to-machine authentication.

Open structured catalog ARD manifest llms.txt

For agents

ARD: https://authenticationapis.com/.well-known/ard.json
Catalog: https://authenticationapis.com/api/catalog.json
LLM overview: https://authenticationapis.com/llms.txt

Tasks this gateway can help discover

Find authentication APIs for user sign-in and session management

Find API-first authentication providers with OAuth, OIDC, MFA or passkeys

Find authentication APIs for B2B SSO and enterprise user management

Find authentication APIs for machine-to-machine services or AI agents

Authentication API directory

A curated semantic index of public authentication APIs and developer documentation. Verify implementation details against each provider's official documentation. Curated: 2026-09-17.

Curated

Amazon Cognito User Pools API

AWS · Authentication

API for configuring user pools and authenticating users, with support for server-side and client-side authentication and federated identity flows.

User poolsUser authenticationFederationOIDC

OpenAPI: Unknown · Agent actionable: Yes

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Curated

Auth0 Authentication APIs

Auth0 · Authentication

Authentication and authorization APIs for login flows, token issuance, API access and identity workflows.

OAuth 2.0OpenID ConnectTokensMFA

OpenAPI: Unknown · Agent actionable: Yes

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Curated

Clerk Backend API

Clerk · Authentication

REST backend API for users, organizations, sessions, invitations, API keys, M2M tokens and authentication-related resources.

UsersSessionsOrganizationsAPI keys

OpenAPI: Yes · Agent actionable: Yes

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Curated

Descope REST API

Descope · Authentication

REST API covering authentication methods, sessions and identity management including OTP, magic links, OAuth, SAML, WebAuthn and TOTP.

OTPMagic LinkOAuthSAML

OpenAPI: Yes · Agent actionable: Yes

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Curated

Firebase Auth REST API

Google Firebase · Authentication

REST API for creating users, signing users in, exchanging custom tokens and managing Firebase Authentication identities.

User signupSign-inCustom tokensToken refresh

OpenAPI: Unknown · Agent actionable: Yes

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Curated

FusionAuth APIs

FusionAuth · Authentication

REST APIs for login, registration, users and authentication workflows with API key, JWT, client-credentials and other supported authentication modes.

LoginRegistrationUsersOAuth/OIDC

OpenAPI: Unknown · Agent actionable: Yes

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Curated

Okta Authentication API

Okta · Authentication

API for primary authentication, multifactor enrollment and verification, password recovery and account unlock flows.

User authenticationMFAPassword recoveryAccount recovery

OpenAPI: Unknown · Agent actionable: Yes

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Curated

Stytch Authentication APIs

Stytch · Authentication

Developer authentication platform with APIs for consumer and B2B auth, SSO, MFA, sessions and machine-to-machine authentication.

B2B authenticationConsumer authenticationSSOMFA

OpenAPI: Unknown · Agent actionable: Yes

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Curated

Supabase Auth

Supabase · Authentication

Authentication service with APIs and SDKs for password, magic-link, OTP, social login, SSO and JWT-based sessions.

PasswordsMagic LinkOTPSocial login

OpenAPI: Unknown · Agent actionable: Yes

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Curated

WorkOS AuthKit API

WorkOS · Authentication

Authentication and user-management APIs supporting passwords, SSO, social login, MFA, Magic Auth and organization-aware flows.

AuthenticationSSOMFAUser management

OpenAPI: Unknown · Agent actionable: Yes

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