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 OAuth.

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
32.9/100 thin Agent 38/100 agent aware Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyCryptoIdentityAuthenticationOAuthOpenID ConnectProof of HumanityBlockchainSolanaAgents

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 32.9/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 16.1 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 38/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 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 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs

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,...

MCP Servers

alien-mcp.yml

MCP SERVER

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
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Components
Components
 Conventions
Conventions
 Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
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)

apis.yml Raw ↑ 
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
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: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- 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
  - 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: MCPServer
  url: mcp/alien-mcp.yml
- 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