# Authentication

**Canonical:** https://apis.io/providers/authentication/  
**APIs profiled:** 0

A curated index of services, tooling, and open source solutions for API authentication, authorization, identity management, and secrets management. This collection covers identity providers, SSO platforms, privileged access management, MFA, open source identity servers, and authentication standards including OAuth 2.0, OpenID Connect, SAML 2.0, FIDO2/WebAuthn, and SCIM.

## Kin Score — 2.6 / 100 (minimal)

Scored 2026-10-23 under rubric 0.25.0. Trend: flat (+0.0 from 2.6).

| Facet | Score |
|---|---|
| Discoverability | 48.2 |
| Contract Quality | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 0.0 (matched via fallback).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |

## Use cases (4)

- **Identity Provider Selection** — Compare authentication platforms across self-hosted, cloud, and enterprise tiers to select the right identity provider.
- **SSO Implementation** — Find SSO platforms and libraries for implementing single sign-on across applications and services.
- **API Security Research** — Research authentication standards, security patterns, and best practices for securing REST, GraphQL, and gRPC APIs.
- **Zero Trust Architecture** — Discover identity verification services for zero trust network access and continuous authentication architectures.

## Tags

Authentication, Authorization, Identity, MFA, OpenID Connect, SAML, Security, SSO

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/authentication/). Scores are computed from the provider's own public artifacts under a published rubric.