A Machine-Readable Index for Your APIs

APIs.json is an open source format that API providers use to describe their API operations — like a sitemap.xml for APIs. It indexes OpenAPI specs, JSON Schema, documentation, pricing, terms of service, and more, making your APIs discoverable by APIs.io and other tools.

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Example APIs.json

name: Acme Developer API
description: The Acme platform API for managing accounts, resources, and integrations.
url: https://api.acme.com/apis.json
created: "2024-01-01"
modified: "2026-05-01"
specificationVersion: "0.23"
tags:
  - acme
  - accounts
  - platform
maintainers:
  - FN: Acme Engineering
    email: [email protected]
    url: https://developers.acme.com
common:
  - type: Authentication
    url: https://developers.acme.com/authentication
  - type: TermsOfService
    url: https://acme.com/terms
  - type: PrivacyPolicy
    url: https://acme.com/privacy
  - type: StatusPage
    url: https://status.acme.com
prompts:
  - type: AgentPrompt
    url: https://developers.acme.com/prompts/getting-started.md
rules:
  - type: SpectralRules
    url: https://developers.acme.com/governance/acme-rules.yaml
workflows:
  - type: Arazzo
    url: https://developers.acme.com/workflows/onboard-and-charge.yaml
apis:
  - name: Accounts API
    description: Create and manage Acme accounts, users, and permissions.
    humanURL: https://developers.acme.com/accounts
    baseURL: https://api.acme.com/v2/accounts
    image: https://acme.com/images/api-icon.png
    tags:
      - accounts
      - users
      - permissions
    properties:
      - type: Documentation
        url: https://developers.acme.com/accounts/docs
      - type: OpenAPI
        url: https://developers.acme.com/specs/accounts-v2.yaml
      - type: GettingStarted
        url: https://developers.acme.com/getting-started
      - type: Pricing
        url: https://acme.com/pricing
      - type: ChangeLog
        url: https://developers.acme.com/changelog
      - type: RoadMap
        url: https://developers.acme.com/roadmap
      - type: Support
        url: https://github.com/acme/api/issues
  - name: Payments API
    description: Process payments, manage subscriptions, and handle refunds.
    humanURL: https://developers.acme.com/payments
    baseURL: https://api.acme.com/v2/payments
    image: https://acme.com/images/api-icon.png
    tags:
      - payments
      - billing
      - subscriptions
    properties:
      - type: Documentation
        url: https://developers.acme.com/payments/docs
      - type: OpenAPI
        url: https://developers.acme.com/specs/payments-v2.yaml
      - type: PostmanCollection
        url: https://www.postman.com/acme/workspace/payments-api
      - type: Webhooks
        url: https://developers.acme.com/payments/webhooks
      - type: SDKs
        url: https://developers.acme.com/sdks
    workflows:
      - type: Arazzo
        url: https://developers.acme.com/workflows/charge-and-refund.yaml
    prompts:
      - type: AgentPrompt
        url: https://developers.acme.com/prompts/take-a-payment.md

Who Is Using APIs.json?

91 providers publish an authoritative APIs.json — an index served on the same domain as the APIs it describes, indexing 197 APIs between them. Every link below was fetched and parsed on 2026-08-26; a 200 alone does not earn a place here.