Alien

Alien is a proof-of-humanity protocol with its own Layer 1 blockchain that verifies users are real, unique humans without storing biometrics, documents, or personal data — retaining only cryptographic proofs, hashes, and Merkle roots via its Continuous Human Verification Protocol (CHVP). For developers, Alien ships Alien SSO: a standard OpenID Connect / OAuth 2.0 identity provider (authorization code + PKCE, DPoP-bound tokens) that lets apps offer "Sign in with Alien ID" so users prove personhood without sharing name or email. It also provides Alien Agent ID (Ed25519 cryptographic identity linking AI agents to a verified human owner), a Mini Apps SDK, Solana wallet-linking attestations, and first-party JavaScript/React/Python SDKs plus a CLI. Backed by Initialized Capital.

Alien publishes 1 API on the APIs.io network. Tagged areas include Company, Crypto, Identity, Authentication, and OpenID Connect.

Alien’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, signup flow, CLI, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.6/100 thin ▬ flat Agent 15/100 agent aware Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-09-21 · rubric v0.22.0

AccessSelf serve

1 APIs

Company Crypto Identity Authentication OpenID ConnectProof of HumanityBlockchain Solana Agents

Kin Score

Kin Score How this is scored →
scored 2026-09-21 · rubric v0.22.0

Composite quality — 31.6/100 · thin

Contract Quality 0.0 / 25

Developer Ergonomics 14.6 / 20

Access Clarity 6.8 / 20

Operational Transparency 0.3 / 13

Contract Governance 2.2 / 12

Discoverability 7.6 / 10

Agent readiness — 15/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/alien: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Alien SSO

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,...

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Alien Authentication

oauth2/openIdConnect · 2 schemes

SECURITY

Alien Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Alien Scopes

1 scope · authorizationCode

1 scopes

SCOPES

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Components

Conventions

Conformance

ErrorCatalog

Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

Twitter

Twitter

Source (apis.yml)

aid: alien
name: Alien
description: 'Alien is a proof-of-humanity protocol with its own Layer 1 blockchain that verifies users are real, unique humans
  without storing biometrics, documents, or personal data — retaining only cryptographic proofs, hashes, and Merkle roots
  via its Continuous Human Verification Protocol (CHVP). For developers, Alien ships Alien SSO: a standard OpenID Connect
  / OAuth 2.0 identity provider (authorization code + PKCE, DPoP-bound tokens) that lets apps offer "Sign in with Alien ID"
  so users prove personhood without sharing name or email. It also provides Alien Agent ID (Ed25519 cryptographic identity
  linking AI agents to a verified human owner), a Mini Apps SDK, Solana wallet-linking attestations, and first-party JavaScript/React/Python
  SDKs plus a CLI. Backed by Initialized Capital.'
url: https://raw.githubusercontent.com/api-evangelist/alien/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://alien.org/favicon.ico
x-type: company
x-source: vc-portfolio
x-backed-by:
- initialized-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-17'
x-docs-platform: nextra
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-17
tags:
- Company
- Crypto
- Identity
- Authentication
- OpenID Connect
- Proof of Humanity
- Blockchain
- Solana
- Agents
tags_raw:
- Company
- Crypto
- Identity
- Authentication
- OAuth
- OpenID Connect
- Proof of Humanity
- Blockchain
- Solana
- Agents
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Alien SSO
  description: 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.
  humanURL: https://docs.alien.org/sso-api-reference/api-reference-core
  baseURL: https://sso.alien-api.com
  tags:
  - Authentication
  - OpenID Connect
  - Identity
  tags_raw:
  - Authentication
  - OAuth
  - OpenID Connect
  - Identity
  properties:
  - type: Documentation
    url: https://docs.alien.org/sso-guide/introduction
  - type: APIReference
    url: https://docs.alien.org/sso-api-reference/api-reference-core
  - type: Authentication
    url: authentication/alien-authentication.yml
  - type: OAuthScopes
    url: scopes/alien-scopes.yml
common:
- type: DomainSecurity
  url: security/alien-domain-security.yml
- type: Website
  url: https://alien.org/
- type: DeveloperPortal
  url: https://docs.alien.org
- type: Documentation
  url: https://docs.alien.org
- type: APIReference
  url: https://docs.alien.org/sso-api-reference/api-reference-core
- type: GettingStarted
  url: https://docs.alien.org/sso-guide/introduction
- type: GitHubOrganization
  url: https://github.com/alien-id
- type: Blog
  url: https://alien.org/blog
- type: Support
  url: https://discord.gg/alien
- type: SignUp
  url: https://app.alien.org
- type: TermsOfService
  url: https://alien.org/legal/terms
- type: PrivacyPolicy
  url: https://alien.org/legal/privacy
- type: Twitter
  url: https://x.com/alienorg
- type: Packages
  url: packages/alien-packages.yml
- type: SDKs
  url: packages/alien-packages.yml
- type: CLI
  url: cli/alien-cli.yml
- type: Components
  url: components/alien-components.yml
- type: WellKnown
  url: well-known/alien-well-known.yml
- type: LLMsTxt
  url: llms/alien-llms.txt
- type: Authentication
  url: authentication/alien-authentication.yml
- type: OAuthScopes
  url: scopes/alien-scopes.yml
- type: Conventions
  url: conventions/alien-conventions.yml
- type: Conformance
  url: conformance/alien-conformance.yml
- type: ErrorCatalog
  url: errors/alien-problem-types.yml
- type: X-MCPServerCandidate
  url: mcp/alien-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Lifecycle
  url: lifecycle/alien-lifecycle.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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