VulnCheck

VulnCheck is an exploit and vulnerability intelligence company that supplies machine-readable data on known exploited vulnerabilities, exploit maturity, threat-actor activity, initial-access exploitation, IP and target intelligence, CPE/PURL identity and vendor advisories. Its Exploit & Vulnerability Intelligence platform enriches CVE records ahead of NIST NVD, publishes the VulnCheck KEV catalog, and exposes everything through a 521-operation REST API at api.vulncheck.com/v3 covering 490+ named indices, alongside a Go SDK, Python SDK, a scripting/agent-oriented CLI, an MCP server and a published Claude Code agent skill. A free Community tier provides VulnCheck KEV and NVD++ data.

VulnCheck publishes 2 API contracts indexed on the APIs.io network: Endpoints API and Indices API. Tagged areas include Company, Security, Vulnerability Intelligence, Exploit Intelligence, and Threat Intelligence.

The VulnCheck catalog on APIs.io includes 1 Spectral governance ruleset.

VulnCheck’s developer surface includes documentation, API reference, getting-started guide, signup flow, support, engineering blog, changelog, and 25 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

57.2/100 strong ▬ flat Agent 34/100 agent ready Front door AI 3/6 light Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract 1 MCP Servers 4 Agent Skills

Company Security Vulnerability IntelligenceExploit IntelligenceThreat Intelligence Cybersecurity CVE Vulnerability Management Data

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Cybersecurity Management

BC-620

EndpointsIndices

GET /index/adobe GET /cpe GET /purl GET /search/cve

Kin Score

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

Composite quality — 57.2/100 · strong

Contract Quality 9.0 / 19

Developer Ergonomics 11.8 / 15

Access Clarity 8.3 / 15

Operational Transparency 5.6 / 10

Contract Governance 1.6 / 9

Discoverability 5.4 / 8

Regulatory Posture 4.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 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 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 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):

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)
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 47.8 — up to +13.1 composite points
Contract Governance scores 18.2 — up to +9.8 composite points
Access Clarity scores 55.3 — up to +8.9 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/vulncheck/apis.yml: open an issue on github.com/api-evangelist/vulncheck 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
Agent Skills (SKILL.md packages)	standard	39.2	-	1
Cisco DevNet Ecosystem (builders on Meraki, Catalyst, ISE, ThousandEyes, Splunk)	standard	39.2	-	1
ServiceNow Store (partner apps + ServiceNow Certified App)	standard	39.2	-	1

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 3

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

Agent Skills

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

VulnCheck Endpoints API

The endpoints API from VulnCheck — 13 operation(s) for endpoints.

VulnCheck Indices API

The indices API from VulnCheck — 508 operation(s) for indices.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

VulnCheck MCP Server

MCP server requiring an API key; 24 tools listed.

MCP SERVER

Agent Skills 4

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

vulncheck-c2-blocklist

AGENT SKILL

vulncheck-cli

AGENT SKILL

vulncheck-cve-triage

AGENT SKILL

vulncheck-dependency-vulnerabilities

AGENT SKILL

VulnCheck API pricing

Prices published by VulnCheck. A free plan or tier is listed.

Plan	Price
Community	Free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Vulncheck Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Vulncheck Rate Limits

1 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

VulnCheck

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Vulncheck Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

VulnCheck API Rules

63 rules · 54 errors 8 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.

Vulncheck Api Overlay

7 actions · documentation · vulncheck-api-openapi-original.json

DERIVED

Security Posture 3

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

Vulncheck Authentication

apiKey · 3 schemes

SECURITY

Vulncheck Domain Security

TLSv1.3 · DMARC

SECURITY

Vulncheck Vulnerability Disclosure

security.txt · contact published

SECURITY

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 4

MCP servers, agent skills, and machine-readable catalogs

WellKnown

MCPServer

AgentSkill

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Conformance

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 4

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 3

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: vulncheck
name: VulnCheck
description: VulnCheck is an exploit and vulnerability intelligence company that supplies machine-readable data on known exploited
  vulnerabilities, exploit maturity, threat-actor activity, initial-access exploitation, IP and target intelligence, CPE/PURL
  identity and vendor advisories. Its Exploit & Vulnerability Intelligence platform enriches CVE records ahead of NIST NVD,
  publishes the VulnCheck KEV catalog, and exposes everything through a 521-operation REST API at api.vulncheck.com/v3 covering
  490+ named indices, alongside a Go SDK, Python SDK, a scripting/agent-oriented CLI, an MCP server and a published Claude
  Code agent skill. A free Community tier provides VulnCheck KEV and NVD++ data.
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.vulncheck.com/logo.png
url: https://raw.githubusercontent.com/api-evangelist/vulncheck/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-09-04'
modified: '2026-10-06'
tags:
- Company
- Security
- Vulnerability Intelligence
- Exploit Intelligence
- Threat Intelligence
- Cybersecurity
- CVE
- Vulnerability Management
- Data
apis:
- aid: vulncheck:vulncheck-endpoints-api
  name: VulnCheck Endpoints API
  description: The endpoints API from VulnCheck — 13 operation(s) for endpoints.
  humanURL: https://docs.vulncheck.com/api
  baseURL: https://api.vulncheck.com/v3
  tags: []
  tags_raw:
  - endpoints
  properties:
  - type: OpenAPI
    url: openapi/vulncheck-endpoints-api-openapi.yml
  - type: Documentation
    url: https://docs.vulncheck.com/api
  - type: Authentication
    url: authentication/vulncheck-authentication.yml
  - type: RateLimits
    url: rate-limits/vulncheck-rate-limits.yml
  - type: ErrorCatalog
    url: errors/vulncheck-problem-types.yml
  - type: Conventions
    url: conventions/vulncheck-conventions.yml
  - type: DataModel
    url: data-model/vulncheck-data-model.yml
  - type: ToolCrosswalk
    url: mcp/vulncheck-tool-crosswalk.yml
- aid: vulncheck:vulncheck-indices-api
  name: VulnCheck Indices API
  description: The indices API from VulnCheck — 508 operation(s) for indices.
  humanURL: https://docs.vulncheck.com/api
  baseURL: https://api.vulncheck.com/v3
  tags:
  - Indices
  tags_raw:
  - indices
  properties:
  - type: OpenAPI
    url: openapi/vulncheck-indices-api-openapi.yml
  - type: Documentation
    url: https://docs.vulncheck.com/api
  - type: Authentication
    url: authentication/vulncheck-authentication.yml
  - type: RateLimits
    url: rate-limits/vulncheck-rate-limits.yml
  - type: ErrorCatalog
    url: errors/vulncheck-problem-types.yml
  - type: Conventions
    url: conventions/vulncheck-conventions.yml
  - type: DataModel
    url: data-model/vulncheck-data-model.yml
  - type: ToolCrosswalk
    url: mcp/vulncheck-tool-crosswalk.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.vulncheck.com/feed/blog/atom.xml
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/vulncheck-capability-edges.yml
  name: VulnCheck Business Capability Map
- type: Overlay
  url: overlays/vulncheck-api-overlay.yaml
- type: Website
  url: https://www.vulncheck.com/
- type: DeveloperPortal
  url: https://docs.vulncheck.com/
- type: Documentation
  url: https://docs.vulncheck.com/
- type: APIReference
  url: https://docs.vulncheck.com/api
- type: GettingStarted
  url: https://docs.vulncheck.com/getting-started
- type: SignUp
  url: https://console.vulncheck.com/register
- type: Login
  url: https://console.vulncheck.com/login
- type: Support
  url: https://www.vulncheck.com/contact
- type: Blog
  url: https://www.vulncheck.com/blog
- type: GitHubOrganization
  url: https://github.com/vulncheck-oss
- type: TermsOfService
  url: https://www.vulncheck.com/terms
- type: PrivacyPolicy
  url: https://www.vulncheck.com/privacy
- type: StatusPage
  url: https://status.vulncheck.com/
- type: ChangeLog
  url: https://docs.vulncheck.com/changelog
- type: Security
  url: https://www.vulncheck.com/vulnerability-disclosure-policy
- type: SecurityTxt
  url: well-known/vulncheck-security.txt
- type: WellKnown
  url: well-known/vulncheck-well-known.yml
- type: VulnerabilityDisclosure
  url: security/vulncheck-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/vulncheck-domain-security.yml
- type: Packages
  url: packages/vulncheck-packages.yml
- type: SDKs
  url: packages/vulncheck-packages.yml
- type: CLI
  url: cli/vulncheck-cli.yml
- type: MCPServer
  url: mcp/vulncheck-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/vulncheck-llms.txt
- type: Lifecycle
  url: lifecycle/vulncheck-lifecycle.yml
- type: Conformance
  url: conformance/vulncheck-conformance.yml
- type: Plans
  url: plans/vulncheck-plans-pricing.yml
- type: RateLimits
  url: rate-limits/vulncheck-rate-limits.yml
x-enrichment:
  date: '2026-09-04'
  status: enriched
  artifacts_added: 26
  pass: local-v3

VulnCheck API — frequently asked questions

Does VulnCheck have an API?

Yes. APIs.io lists 2 APIs from VulnCheck, including VulnCheck Endpoints API and VulnCheck Indices API.

Is there an OpenAPI specification for the VulnCheck API?

Yes. APIs.io indexes 2 OpenAPI specifications for VulnCheck, each linked for download from this page.

How do I authenticate with the VulnCheck API?

VulnCheck uses bearer-token authentication (apiKey · 3 schemes). The details are profiled on APIs.io as Vulncheck Authentication.

How much does the VulnCheck API cost?

APIs.io lists 1 pricing plan for VulnCheck, with each plan's price, limits and inclusions under Pricing on this page.

Does VulnCheck have an MCP server?

Yes. APIs.io lists 1 MCP server for VulnCheck: MCP server requiring an API key; 24 tools listed.

Is the VulnCheck API ready for AI agents?

VulnCheck has a Kin Score of 57.2 out of 100 (strong) and an Agent Readiness score of 33.8 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

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Every operation they expose

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How their score was established

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