# Alien SSO

**Canonical:** https://apis.io/apis/alien/alien-sso/  
**Provider:** Alien — https://apis.io/providers/alien/  
**Base URL:** https://sso.alien-api.com  
**Documentation:** https://docs.alien.org/sso-api-reference/api-reference-core

Alien SSO is published by [Alien](https://apis.io/providers/alien/) on the [APIs.io](https://apis.io/) network. Tagged areas include Authentication, OpenID Connect, and Identity. The published artifact set on APIs.io includes API documentation, an API reference, and authentication docs.

OpenID Connect / OAuth 2.0 identity provider for proof-of-humanity sign-in. Authorization code + PKCE (S256), refresh tokens, optional DPoP (RFC 9449) sender-constrained tokens, and Agent ID (Ed25519) verification.

## Machine-readable artifacts (5)

- **Documentation** — https://docs.alien.org/sso-guide/introduction
- **APIReference** — https://docs.alien.org/sso-api-reference/api-reference-core
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/alien/refs/heads/main/authentication/alien-authentication.yml
- **OAuthScopes** — https://raw.githubusercontent.com/api-evangelist/alien/refs/heads/main/scopes/alien-scopes.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/alien/refs/heads/main/apis.yml

## Tags

Authentication, OpenID Connect, Identity

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/alien/alien-sso/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/alien/.