Antigen

Antigen is an AI-powered continuous offensive security platform for the enterprise. It deploys autonomous AI penetration-testing agents against production systems every night, maps and exploits the full attack surface, and pairs the automated testing with a monthly human red-team assessment. Findings ship with reproduction steps and remediation guidance delivered directly into engineering tools such as GitHub and Linear. Antigen serves financial services, healthcare, retail, and government sectors, and is a Y Combinator (Fall 2025) company backed by Lightspeed, DST Global, and Susa Ventures.

Antigen is profiled on the APIs.io network. Tagged areas include Company, Security, Cybersecurity, Penetration Testing, and Offensive Security.

Antigen’s developer surface includes engineering blog, support, and 3 more developer resources.

🌐 Visit website 📡 Source on GitHub

10.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanySecurityCybersecurityPenetration TestingOffensive SecurityRed TeamArtificial IntelligenceVulnerability Management

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 10.7/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 2.6 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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/antigen: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 1

Portal, sign-up, and the first successful call

Login

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: antigen
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/antigen.png
name: Antigen
description: Antigen is an AI-powered continuous offensive security platform for the enterprise. It deploys autonomous AI
  penetration-testing agents against production systems every night, maps and exploits the full attack surface, and pairs
  the automated testing with a monthly human red-team assessment. Findings ship with reproduction steps and remediation guidance
  delivered directly into engineering tools such as GitHub and Linear. Antigen serves financial services, healthcare, retail,
  and government sectors, and is a Y Combinator (Fall 2025) company backed by Lightspeed, DST Global, and Susa Ventures.
url: https://raw.githubusercontent.com/api-evangelist/antigen/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- Company
- Security
- Cybersecurity
- Penetration Testing
- Offensive Security
- Red Team
- Artificial Intelligence
- Vulnerability Management
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/antigen-domain-security.yml
- type: Website
  url: https://antigen.sh/
- type: Login
  url: https://platform.antigen.sh/
- type: Blog
  url: https://antigen.sh/research
- type: Support
  url: https://antigen.sh/demo
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence