Gray Swan website screenshot

Gray Swan

Gray Swan AI is an AI security company that helps enterprises deploy AI with confidence. Its Cygnal product is a real-time, drop-in secure proxy that fronts LLM providers (OpenAI, Anthropic, and Gemini request formats) with input/output filtering and threat monitoring for jailbreaks and prompt injection, governed by versioned enforcement Policies managed over a REST API. Gray Swan also operates Shade (an adversarial red-teaming platform), Arena (a global adversarial red-teaming network), and adversarial model evaluations that frontier AI labs run before shipping. The company is SOC 2 Type 2 and Cyber Essentials certified.

Gray Swan publishes 3 APIs on the APIs.io network: Activity API, Cygnal API, and Policies API. Tagged areas include Company, Ai, AI Security, LLM Security, and Guardrails.

Gray Swan’s developer surface includes documentation, API reference, quickstart, signup flow, engineering blog, authentication, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub
45.8/100 developing ▬ flat Agent 53/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
3 APIs
CompanyAiAI SecurityLLM SecurityGuardrailsRed TeamingAI GovernancePrompt InjectionModel SafetyAPI Security

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 45.8/100 · developing
Contract Quality 12.9 / 25
Developer Ergonomics 10.9 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 2.1 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 53/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
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 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 3 / 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/gray-swan: 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 3

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

Gray Swan Activity API

The Activity API from Gray Swan — 1 operation(s) for activity.

Gray Swan Cygnal API

The Cygnal API from Gray Swan — 7 operation(s) for cygnal.

Gray Swan Policies API

The Policies API from Gray Swan — 8 operation(s) for policies.

Rate Limits 1

Documented rate limits and quota policies.

Gray Swan Rate Limits

0 limits

RATE LIMITS

Security Posture 4

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

Gray Swan Authentication

1 scheme

SECURITY

Gray Swan Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Gray Swan Vulnerability Disclosure

security.txt · contact published

SECURITY

Gray Swan Trust Center

SOC 2 Type 2, Cyber Essentials

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 Quickstart
Quickstart
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill
 WellKnown
WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 DataModel
DataModel
 Lifecycle
Lifecycle
 Conformance
Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 7

Authentication, authorization, and security posture

Authentication
Authentication
 Compliance
Compliance
 SecurityTxt
SecurityTxt
 Security
Security
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 TrustCenter
TrustCenter

Scroll for all 7

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: gray-swan
name: Gray Swan
description: Gray Swan AI is an AI security company that helps enterprises deploy AI with confidence. Its Cygnal product is
  a real-time, drop-in secure proxy that fronts LLM providers (OpenAI, Anthropic, and Gemini request formats) with input/output
  filtering and threat monitoring for jailbreaks and prompt injection, governed by versioned enforcement Policies managed
  over a REST API. Gray Swan also operates Shade (an adversarial red-teaming platform), Arena (a global adversarial red-teaming
  network), and adversarial model evaluations that frontier AI labs run before shipping. The company is SOC 2 Type 2 and Cyber
  Essentials certified.
url: https://raw.githubusercontent.com/api-evangelist/gray-swan/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- wing-venture-capital
x-tier: enriched
x-tier-reason: portfolio-lead
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://cdn.prod.website-files.com/6614467b00e631b0f073e2b7/66886e33ca0b8f284d3b3b40_ca18847e7b3f6e2e7038dac7bd3846ce_Gray%20Swan%3DWhite%20Horizontal.svg
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Ai
- AI Security
- LLM Security
- Guardrails
- Red Teaming
- AI Governance
- Prompt Injection
- Model Safety
- API Security
apis:
- aid: gray-swan:gray-swan-activity-api
  name: Gray Swan Activity API
  description: The Activity API from Gray Swan — 1 operation(s) for activity.
  humanURL: https://docs.grayswan.ai/api-reference
  baseURL: https://api.grayswan.ai
  tags:
  - Activity
  properties:
  - type: OpenAPI
    url: openapi/gray-swan-activity-api-openapi.yml
  - type: Documentation
    url: https://docs.grayswan.ai/
  - type: APIReference
    url: https://docs.grayswan.ai/api-reference
- aid: gray-swan:gray-swan-cygnal-api
  name: Gray Swan Cygnal API
  description: The Cygnal API from Gray Swan — 7 operation(s) for cygnal.
  humanURL: https://docs.grayswan.ai/api-reference
  baseURL: https://api.grayswan.ai
  tags:
  - Cygnal
  properties:
  - type: OpenAPI
    url: openapi/gray-swan-cygnal-api-openapi.yml
  - type: Documentation
    url: https://docs.grayswan.ai/
  - type: APIReference
    url: https://docs.grayswan.ai/api-reference
- aid: gray-swan:gray-swan-policies-api
  name: Gray Swan Policies API
  description: The Policies API from Gray Swan — 8 operation(s) for policies.
  humanURL: https://docs.grayswan.ai/api-reference
  baseURL: https://api.grayswan.ai
  tags:
  - Policies
  properties:
  - type: OpenAPI
    url: openapi/gray-swan-policies-api-openapi.yml
  - type: Documentation
    url: https://docs.grayswan.ai/
  - type: APIReference
    url: https://docs.grayswan.ai/api-reference
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.grayswan.ai/
- type: DeveloperPortal
  url: https://docs.grayswan.ai/
- type: Documentation
  url: https://docs.grayswan.ai/
- type: APIReference
  url: https://docs.grayswan.ai/api-reference
- type: Quickstart
  url: https://docs.grayswan.ai/cygnal/creating-completions
- type: SignUp
  url: https://platform.grayswan.ai
- type: Blog
  url: https://www.grayswan.ai/blog
- type: GitHubOrganization
  url: https://github.com/GraySwanAI
- type: TermsOfService
  url: https://www.grayswan.ai/terms-of-service
- type: PrivacyPolicy
  url: https://www.grayswan.ai/privacy-policy
- type: Authentication
  url: authentication/gray-swan-authentication.yml
- type: ErrorCatalog
  url: errors/gray-swan-problem-types.yml
- type: RateLimits
  url: rate-limits/gray-swan-rate-limits.yml
- type: Conventions
  url: conventions/gray-swan-conventions.yml
- type: DataModel
  url: data-model/gray-swan-data-model.yml
- type: Lifecycle
  url: lifecycle/gray-swan-lifecycle.yml
- type: Conformance
  url: conformance/gray-swan-conformance.yml
- type: Compliance
  url: conformance/gray-swan-conformance.yml
- type: LLMsTxt
  url: llms/gray-swan-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: WellKnown
  url: well-known/gray-swan-well-known.yml
- type: SecurityTxt
  url: well-known/gray-swan-security.txt
- type: Security
  url: https://grayswan.ai/security
- type: VulnerabilityDisclosure
  url: security/gray-swan-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/gray-swan-domain-security.yml
- type: TrustCenter
  url: security/gray-swan-trust-center.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence