OpenSSF

The Open Source Security Foundation (OpenSSF) is a collaborative initiative under the Linux Foundation dedicated to improving the security of open source software. It brings together industry leaders, developers, and security experts to address vulnerabilities, enhance supply chain security, and develop security tools and best practices. OpenSSF stewards a number of projects with public REST APIs, including the OSV (Open Source Vulnerabilities) database, the Scorecard automated security health-check service, and Sigstore signing infrastructure.

OpenSSF publishes 5 APIs on the APIs.io network, including Projects API, Query API, Querybatch API, and 2 more. Tagged areas include Linux Foundation, Open Source, Security, Supply Chain, and Vulnerabilities.

The OpenSSF catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

OpenSSF’s developer surface includes documentation, developer portal, engineering blog, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

48.3/100 developing ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemium

7 APIs

Linux FoundationOpen SourceSecuritySupply ChainVulnerabilities

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 48.3/100 · developing

Contract Quality 16.5 / 25

Developer Ergonomics 4.8 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 4.8 / 13

Governance 7.0 / 12

Discoverability 7.4 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

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 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

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/openssf: 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 7

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

GraphQL 1

GraphQL schemas published by this provider.

Rate Limits 1

Documented rate limits and quota policies.

Openssf Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

GitHubRepository

GitHubRepository

GitHubRepository

GitHubRepository

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Community

Community

Slack

Slack

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: openssf
name: OpenSSF
description: The Open Source Security Foundation (OpenSSF) is a collaborative initiative under the Linux Foundation dedicated
  to improving the security of open source software. It brings together industry leaders, developers, and security experts
  to address vulnerabilities, enhance supply chain security, and develop security tools and best practices. OpenSSF stewards
  a number of projects with public REST APIs, including the OSV (Open Source Vulnerabilities) database, the Scorecard automated
  security health-check service, and Sigstore signing infrastructure.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/openssf.png
tags:
- Linux Foundation
- Open Source
- Security
- Supply Chain
- Vulnerabilities
created: '2026-03-16'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: openssf:sigstore-api
  name: Sigstore Public Good APIs
  description: Sigstore is an OpenSSF-hosted standard and service for signing, verifying, and protecting software. The public-good
    Sigstore instance exposes Fulcio (code-signing certificate authority) and Rekor (transparency log) APIs that can be queried
    programmatically to inspect signing certificates and transparency log entries.
  humanURL: https://www.sigstore.dev/
  baseURL: https://rekor.sigstore.dev
  tags:
  - Signing
  - Transparency Log
  - Supply Chain
  properties:
  - type: Documentation
    url: https://docs.sigstore.dev/
  - type: Documentation
    url: https://docs.sigstore.dev/logging/overview/
  - type: GitHubOrganization
    url: https://github.com/sigstore
- aid: openssf:guac-api
  name: GUAC (Graph for Understanding Artifact Composition)
  description: GUAC aggregates software supply-chain security metadata (SBOMs, attestations, vulnerabilities, signatures)
    into a queryable graph. GUAC exposes a GraphQL API for supply-chain queries when self-hosted.
  humanURL: https://guac.sh/
  baseURL: https://guac.sh
  tags:
  - SBOM
  - Supply Chain
  - GraphQL
  properties:
  - type: Documentation
    url: https://docs.guac.sh/
  - type: GitHubRepository
    url: https://github.com/guacsec/guac
  - url: graphql/openssf-graphql.md
    type: GraphQL
- aid: openssf:openssf-projects-api
  name: OpenSSF Projects API
  description: The Projects API from OpenSSF — 1 operation(s) for projects.
  humanURL: https://osv.dev/
  baseURL: https://api.osv.dev
  tags:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/openssf-projects-api-openapi.yml
  - type: Documentation
    url: https://google.github.io/osv.dev/api/
  - type: Documentation
    url: https://osv.dev/
  - type: GitHubRepository
    url: https://github.com/google/osv.dev
  - type: GitHubRepository
    url: https://github.com/ossf/osv-schema
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-schema/openssf-osv-vulnerability-schema.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-ld/openssf-context.jsonld
  - type: Documentation
    url: https://github.com/ossf/scorecard
  - type: Documentation
    url: https://scorecard.dev/
- aid: openssf:openssf-query-api
  name: OpenSSF Query API
  description: The Query API from OpenSSF — 1 operation(s) for query.
  humanURL: https://osv.dev/
  baseURL: https://api.osv.dev
  tags:
  - Query
  properties:
  - type: OpenAPI
    url: openapi/openssf-query-api-openapi.yml
  - type: Documentation
    url: https://google.github.io/osv.dev/api/
  - type: Documentation
    url: https://osv.dev/
  - type: GitHubRepository
    url: https://github.com/google/osv.dev
  - type: GitHubRepository
    url: https://github.com/ossf/osv-schema
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-schema/openssf-osv-vulnerability-schema.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-ld/openssf-context.jsonld
  - type: Documentation
    url: https://github.com/ossf/scorecard
  - type: Documentation
    url: https://scorecard.dev/
- aid: openssf:openssf-querybatch-api
  name: OpenSSF Querybatch API
  description: The Querybatch API from OpenSSF — 1 operation(s) for querybatch.
  humanURL: https://osv.dev/
  baseURL: https://api.osv.dev
  tags:
  - Querybatch
  properties:
  - type: OpenAPI
    url: openapi/openssf-querybatch-api-openapi.yml
  - type: Documentation
    url: https://google.github.io/osv.dev/api/
  - type: Documentation
    url: https://osv.dev/
  - type: GitHubRepository
    url: https://github.com/google/osv.dev
  - type: GitHubRepository
    url: https://github.com/ossf/osv-schema
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-schema/openssf-osv-vulnerability-schema.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-ld/openssf-context.jsonld
  - type: Documentation
    url: https://github.com/ossf/scorecard
  - type: Documentation
    url: https://scorecard.dev/
- aid: openssf:openssf-v1experimental-api
  name: OpenSSF V1experimental API
  description: The V1experimental API from OpenSSF — 2 operation(s) for v1experimental.
  humanURL: https://osv.dev/
  baseURL: https://api.osv.dev
  tags:
  - V1experimental
  properties:
  - type: OpenAPI
    url: openapi/openssf-v1experimental-api-openapi.yml
  - type: Documentation
    url: https://google.github.io/osv.dev/api/
  - type: Documentation
    url: https://osv.dev/
  - type: GitHubRepository
    url: https://github.com/google/osv.dev
  - type: GitHubRepository
    url: https://github.com/ossf/osv-schema
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-schema/openssf-osv-vulnerability-schema.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-ld/openssf-context.jsonld
  - type: Documentation
    url: https://github.com/ossf/scorecard
  - type: Documentation
    url: https://scorecard.dev/
- aid: openssf:openssf-vulns-api
  name: OpenSSF Vulns API
  description: The Vulns API from OpenSSF — 1 operation(s) for vulns.
  humanURL: https://osv.dev/
  baseURL: https://api.osv.dev
  tags:
  - Vulns
  properties:
  - type: OpenAPI
    url: openapi/openssf-vulns-api-openapi.yml
  - type: Documentation
    url: https://google.github.io/osv.dev/api/
  - type: Documentation
    url: https://osv.dev/
  - type: GitHubRepository
    url: https://github.com/google/osv.dev
  - type: GitHubRepository
    url: https://github.com/ossf/osv-schema
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-schema/openssf-osv-vulnerability-schema.json
  - type: JSONLDContext
    url: https://raw.githubusercontent.com/api-evangelist/openssf/refs/heads/main/json-ld/openssf-context.jsonld
  - type: Documentation
    url: https://github.com/ossf/scorecard
  - type: Documentation
    url: https://scorecard.dev/
common:
- type: AgenticAccess
  url: agentic-access/openssf-agentic-access.yml
- type: DomainSecurity
  url: security/openssf-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/openssf
- type: Website
  name: OpenSSF
  url: https://openssf.org/
- type: Documentation
  name: OpenSSF Documentation
  url: https://openssf.org/resources/
- type: Portal
  name: Projects Directory
  url: https://openssf.org/projects/
- type: Blog
  name: OpenSSF Blog
  url: https://openssf.org/blog/
- type: GitHubOrganization
  name: OpenSSF GitHub
  url: https://github.com/ossf
- type: GitHubRepository
  name: OSV Schema
  url: https://github.com/ossf/osv-schema
- type: GitHubRepository
  name: Scorecard
  url: https://github.com/ossf/scorecard
- type: GitHubOrganization
  name: Sigstore GitHub
  url: https://github.com/sigstore
- type: License
  name: Apache 2.0
  url: https://www.apache.org/licenses/LICENSE-2.0
- type: Community
  name: OpenSSF Community
  url: https://openssf.org/community/
- type: Slack
  name: OpenSSF Slack
  url: https://slack.openssf.org/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com