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 API contracts indexed on the APIs.io network: Activity API, Cygnal API, and Policies API. Tagged areas include Company, Artificial Intelligence, AI Security, LLM Security, and Guardrails.

The Gray Swan catalog on APIs.io includes 1 Spectral governance ruleset.

Gray Swan’s developer surface includes documentation, API reference, quickstart, signup flow, engineering blog, authentication, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

44.8/100 developing ▬ flat Agent 27/100 agent aware Front door AI 6/6 dominant Heartbeat 62/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 2 Agent Skills

Company Artificial Intelligence AI Security LLM Security Guardrails Red Teaming AI Governance Prompt InjectionModel SafetyAPI Security

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 44.8/100 · developing

Contract Quality 10.1 / 19

Developer Ergonomics 8.1 / 15

Access Clarity 5.5 / 15

Operational Transparency 1.3 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 4.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 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 7 / 7

Rate-Limit Signaling 7 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 0 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 36.8 — up to +12.6 composite points
Contract Quality scores 53.8 — up to +11.6 composite points
Operational Transparency scores 13.2 — up to +11.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/gray-swan/apis.yml: open an issue on github.com/api-evangelist/gray-swan to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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.

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Gray Swan AI Activity API

OPEN COLLECTION

Gray Swan AI Activity Cygnal API

OPEN COLLECTION

Gray Swan AI Activity Policies API

OPEN COLLECTION

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

gray-swan-manage-policies

AGENT SKILL

gray-swan-secure-completions

AGENT SKILL

Rate Limits 1

Documented rate limits and quota policies.

Gray Swan Rate Limits

0 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Gray Swan API Rules

46 rules · 35 errors 10 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Gray Swan Cygnal Overlay

3 actions · documentation · gray-swan-cygnal-openapi.json

DERIVED

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 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

LLMsTxt

AgentSkill

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

DataModel

Lifecycle

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 7

Authentication, authorization, and security posture

Authentication

Compliance

SecurityTxt

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

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://cdn.prod.website-files.com/6614467b00e631b0f073e2b7/66886e33ca0b8f284d3b3b40_ca18847e7b3f6e2e7038dac7bd3846ce_Gray%20Swan%3DWhite%20Horizontal.svg
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Artificial Intelligence
- AI Security
- LLM Security
- Guardrails
- Red Teaming
- AI Governance
- Prompt Injection
- Model Safety
- API Security
tags_raw:
- 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: X-MCPServerCandidate
  url: mcp/gray-swan-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: Overlay
  url: overlays/gray-swan-cygnal-overlay.yaml
- 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

Gray Swan API — frequently asked questions

Does Gray Swan have an API?

Yes. APIs.io lists 3 APIs from Gray Swan, including Gray Swan Activity API, Gray Swan Cygnal API and Gray Swan Policies API.

Is there an OpenAPI specification for the Gray Swan API?

Yes. APIs.io indexes 3 OpenAPI specifications for Gray Swan, each linked for download from this page.

How do I authenticate with the Gray Swan API?

Gray Swan uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Gray Swan Authentication.

Is the Gray Swan API ready for AI agents?

Gray Swan has a Kin Score of 44.8 out of 100 (developing) and an Agent Readiness score of 26.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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