Empirical Security

Empirical Security builds data-driven models that predict which vulnerabilities will actually be exploited, so security teams can prioritize remediation by real-world risk instead of raw CVSS severity. It operates the Foundation (global) model, which combines real-time internet exploitation telemetry with EPSS and monitors 18,000+ exploited CVEs; hourly-updated EPSS models (epss_v3, epss_v4, epss_v5); and Radiant, an organization-specific model that layers your local assets, configurations and internal telemetry on top of the Foundation data. The read-only REST API exposes CVE detail, per-model scores and percentiles, malware hashes, critical indicators, score history, change history, full dataset export, search, and saved CVE groups, secured with OAuth 2.0 client credentials (JWT bearer). Empirical Security is backed by Costanoa Ventures.

Empirical Security publishes 3 API contracts indexed on the APIs.io network: CVE Groups API, Search API, and CV Es API. Tagged areas include Company, Security, Cybersecurity, Vulnerability Management, and Vulnerability Prioritization.

The Empirical Security catalog on APIs.io includes 1 Spectral governance ruleset.

Empirical Security’s developer surface includes documentation, API reference, getting-started guide, engineering blog, signup flow, authentication, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.7/100 thin ▬ flat Agent 34/100 agent ready Front door AI 4/6 moderate Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessSelf serve

1 published contract 2 Agent Skills

Company Security Cybersecurity Vulnerability ManagementVulnerability PrioritizationCVEEPSSExploit PredictionThreat Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 33.7/100 · thin

Contract Quality 3.1 / 21

Developer Ergonomics 9.2 / 17

Access Clarity 5.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 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 4 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

5 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 14.5 — up to +21.4 composite points
Access Clarity scores 34.2 — up to +13.2 composite points
Operational Transparency scores 0.0 — up to +13.0 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/empirical-security/apis.yml: open an issue on github.com/api-evangelist/empirical-security 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
ServiceNow Store (partner apps + ServiceNow Certified App)	standard	19.4 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

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)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 3

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

Empirical Security CVE Groups API

Saved CVE queries and their execution.

Empirical Security Search API

Query CVEs using Empirical search syntax.

Empirical Security CV Es API

Retrieve CVE detail, scores, malware hashes and history.

Open Collections 3

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

Empirical Security CVE Groups API

OPEN COLLECTION

Empirical Security CVE Groups CVEs API

OPEN COLLECTION

Empirical Security CVE Groups Search API

OPEN COLLECTION

Agent Skills 2

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

Monitor a saved CVE group

AGENT SKILL

Prioritize CVEs by exploitation probability

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Empirical Security API Rules

60 rules · 58 errors 1 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.

Empirical Security Openapi Overlay

2 actions · update · empirical-security-openapi.yml

DERIVED

Security Posture 2

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

Empirical Security Authentication

oauth2 · 1 scheme

SECURITY

Empirical Security Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Empirical Security Scopes

1 scope · clientCredentials

1 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Empirical Security Agentic Access

9 operations

9 operations · 0 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

X-MCPServerCandidate

AgenticAccess

LLMsTxt

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

Lifecycle

Conformance

DataModel

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: empirical-security
name: Empirical Security
description: Empirical Security builds data-driven models that predict which vulnerabilities will actually be exploited, so
  security teams can prioritize remediation by real-world risk instead of raw CVSS severity. It operates the Foundation (global)
  model, which combines real-time internet exploitation telemetry with EPSS and monitors 18,000+ exploited CVEs; hourly-updated
  EPSS models (epss_v3, epss_v4, epss_v5); and Radiant, an organization-specific model that layers your local assets, configurations
  and internal telemetry on top of the Foundation data. The read-only REST API exposes CVE detail, per-model scores and percentiles,
  malware hashes, critical indicators, score history, change history, full dataset export, search, and saved CVE groups, secured
  with OAuth 2.0 client credentials (JWT bearer). Empirical Security is backed by Costanoa Ventures.
url: https://raw.githubusercontent.com/api-evangelist/empirical-security/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- costanoa-ventures
x-tier: profiled
x-tier-reason: enrichment-pipeline
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: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-02'
  method: derived
image: https://www.empiricalsecurity.com/favicon.ico
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Security
- Cybersecurity
- Vulnerability Management
- Vulnerability Prioritization
- CVE
- EPSS
- Exploit Prediction
- Threat Intelligence
apis:
- aid: empirical-security:empirical-security-cve-groups-api
  name: Empirical Security CVE Groups API
  description: Saved CVE queries and their execution.
  humanURL: https://docs.empiricalsecurity.com/
  baseURL: https://app.empiricalsecurity.com/api
  tags:
  - CVE Groups
  properties:
  - type: OpenAPI
    url: openapi/empirical-security-cve-groups-api-openapi.yml
  - type: Documentation
    url: https://docs.empiricalsecurity.com/
  - type: APIReference
    url: https://docs.empiricalsecurity.com/api_reference/cves
  - type: Authentication
    url: authentication/empirical-security-authentication.yml
  - type: OAuthScopes
    url: scopes/empirical-security-scopes.yml
  - type: ErrorCatalog
    url: errors/empirical-security-problem-types.yml
  - type: Conventions
    url: conventions/empirical-security-conventions.yml
  - type: Lifecycle
    url: lifecycle/empirical-security-lifecycle.yml
  - type: Conformance
    url: conformance/empirical-security-conformance.yml
  - type: DataModel
    url: data-model/empirical-security-data-model.yml
  - type: AgenticAccess
    url: agentic-access/empirical-security-agentic-access.yml
  - type: LLMsTxt
    url: llms/empirical-security-llms.txt
- aid: empirical-security:empirical-security-search-api
  name: Empirical Security Search API
  description: Query CVEs using Empirical search syntax.
  humanURL: https://docs.empiricalsecurity.com/
  baseURL: https://app.empiricalsecurity.com/api
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/empirical-security-search-api-openapi.yml
  - type: Documentation
    url: https://docs.empiricalsecurity.com/
  - type: APIReference
    url: https://docs.empiricalsecurity.com/api_reference/cves
  - type: Authentication
    url: authentication/empirical-security-authentication.yml
  - type: OAuthScopes
    url: scopes/empirical-security-scopes.yml
  - type: ErrorCatalog
    url: errors/empirical-security-problem-types.yml
  - type: Conventions
    url: conventions/empirical-security-conventions.yml
  - type: Lifecycle
    url: lifecycle/empirical-security-lifecycle.yml
  - type: Conformance
    url: conformance/empirical-security-conformance.yml
  - type: DataModel
    url: data-model/empirical-security-data-model.yml
  - type: AgenticAccess
    url: agentic-access/empirical-security-agentic-access.yml
  - type: LLMsTxt
    url: llms/empirical-security-llms.txt
- aid: empirical-security:empirical-security-cves-api
  name: Empirical Security CV Es API
  description: Retrieve CVE detail, scores, malware hashes and history.
  humanURL: https://docs.empiricalsecurity.com/
  baseURL: https://app.empiricalsecurity.com/api
  tags:
  - CVEs
  properties:
  - type: OpenAPI
    url: openapi/empirical-security-cves-api-openapi.yml
  - type: Documentation
    url: https://docs.empiricalsecurity.com/
  - type: APIReference
    url: https://docs.empiricalsecurity.com/api_reference/cves
  - type: Authentication
    url: authentication/empirical-security-authentication.yml
  - type: OAuthScopes
    url: scopes/empirical-security-scopes.yml
  - type: ErrorCatalog
    url: errors/empirical-security-problem-types.yml
  - type: Conventions
    url: conventions/empirical-security-conventions.yml
  - type: Lifecycle
    url: lifecycle/empirical-security-lifecycle.yml
  - type: Conformance
    url: conformance/empirical-security-conformance.yml
  - type: DataModel
    url: data-model/empirical-security-data-model.yml
  - type: AgenticAccess
    url: agentic-access/empirical-security-agentic-access.yml
  - type: LLMsTxt
    url: llms/empirical-security-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://research.empiricalsecurity.com/research?format=rss
  type: BlogRSS
- type: Overlay
  url: overlays/empirical-security-openapi-overlay.yaml
- type: Website
  url: https://www.empiricalsecurity.com
- type: DeveloperPortal
  url: https://docs.empiricalsecurity.com/
- type: Documentation
  url: https://docs.empiricalsecurity.com/
- type: APIReference
  url: https://docs.empiricalsecurity.com/api_reference/cves
- type: GettingStarted
  url: https://docs.empiricalsecurity.com/authentication
- type: Blog
  url: https://research.empiricalsecurity.com/
- type: SignUp
  url: https://www.empiricalsecurity.com/contact
- type: Login
  url: https://app.empiricalsecurity.com/
- type: TermsOfService
  url: https://www.empiricalsecurity.com/terms-conditions
- type: PrivacyPolicy
  url: https://www.empiricalsecurity.com/privacy-policy
- type: Authentication
  url: authentication/empirical-security-authentication.yml
- type: OAuthScopes
  url: scopes/empirical-security-scopes.yml
- type: ErrorCatalog
  url: errors/empirical-security-problem-types.yml
- type: Conventions
  url: conventions/empirical-security-conventions.yml
- type: Lifecycle
  url: lifecycle/empirical-security-lifecycle.yml
- type: Conformance
  url: conformance/empirical-security-conformance.yml
- type: DataModel
  url: data-model/empirical-security-data-model.yml
- type: WellKnown
  url: well-known/empirical-security-well-known.yml
- type: X-MCPServerCandidate
  url: mcp/empirical-security-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: AgenticAccess
  url: agentic-access/empirical-security-agentic-access.yml
- type: LLMsTxt
  url: llms/empirical-security-llms.txt
- type: DomainSecurity
  url: security/empirical-security-domain-security.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

Empirical Security API — frequently asked questions

Does Empirical Security have an API?

Yes. APIs.io lists 3 APIs from Empirical Security, including Empirical Security CVE Groups API, Empirical Security Search API and Empirical Security CV Es API.

Is there an OpenAPI specification for the Empirical Security API?

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

How do I authenticate with the Empirical Security API?

Empirical Security documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Empirical Security Authentication.

Is the Empirical Security API ready for AI agents?

Empirical Security has a Kin Score of 33.7 out of 100 (thin) and an Agent Readiness score of 34.2 (agent-ready), scored by API Evangelist on 2026-11-02.

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