# API Stack

> API Stack (apistack.io) is a free, public directory of third-party API tooling, built and
> operated by Apideck B.V. as a tenant of its own Apideck Ecosystem marketplace platform. It
> catalogs 213 API tools and services across 46 published category pages spanning the API
> lifecycle: gateways, management, design, authentication, developer portals, documentation,
> specifications, testing, mocking, security, monitoring, analytics, billing and directories.
> API Stack is a discovery surface, not an API product: it publishes no developer portal, no
> API reference, no OpenAPI or other machine-readable contract, no SDKs, no pricing and no
> terms of service of its own. This file was generated by API Evangelist from the catalog
> profile and live probes of 2026-09-02; API Stack does not publish an llms.txt itself.

## Site

- [API Stack home](https://www.apistack.io/): Search and discover API tools.
- [All tools](https://www.apistack.io/all): The full 213-listing index.
- [All categories](https://www.apistack.io/categories/all): The 46 category pages.
- [All collections](https://www.apistack.io/collections/all): Curated groupings of listings.
- [New](https://www.apistack.io/collection/new): Recently added API tools.
- [Zaps](https://www.apistack.io/zaps): Zapier templates associated with listed tools.

## Categories (selected)

- [API Gateways](https://www.apistack.io/category/api-gateways)
- [API Management](https://www.apistack.io/category/api-management)
- [API Design](https://www.apistack.io/category/api-design)
- [API Authentication & OAuth](https://www.apistack.io/category/api-authentication)
- [Developer Documentation](https://www.apistack.io/category/developer-documentation)
- [API Directories & Marketplaces](https://www.apistack.io/category/directories)
- [API Specifications](https://www.apistack.io/category/api-specifications)

## Participate

- [Get listed](https://www.apistack.io/partner/request): Request a listing for your tool.
- [Partner login](https://www.apistack.io/partner/login): Sign in to manage a listing.
- [Request an app](https://www.apistack.io/request): Ask for a tool to be added.

## Legal

- [Privacy policy](https://compliance.apideck.com/privacy-policy): Served from the Apideck
  Compliance Center and linked from the API Stack site chrome. API Stack publishes no terms
  of service page of its own.

## What API Stack does not publish

- No OpenAPI, Swagger, AsyncAPI, GraphQL SDL, WSDL or Protobuf contract of its own.
- No developer portal, API reference, getting started guide or changelog.
- No MCP server and no A2A agent card (/.well-known/agent-card.json and
  /.well-known/agent.json both 404).
- No /.well-known/ discovery documents of any kind.
- No first-party SDK in npm, PyPI, RubyGems or crates.io.
- No pricing page, plans or published rate limits.
- Note: an unauthenticated GraphQL endpoint answers at
  https://www.apistack.io/api/graphql, but its schema is the Apideck Ecosystem / Unify
  platform backend that apistack.io runs on, not an API Stack product API, and it is
  disallowed in robots.txt. It is catalogued under Apideck, not here.

## Related surfaces by the same operator

- [Apideck](https://www.apideck.com/): the operator of API Stack.
- [API Tracker](https://apitracker.io/)
- [Open Banking Tracker](https://www.openbankingtracker.com/)
- [SaaS Blocks](https://saasblocks.io/)

## Machine-readable profile

- [apis.yml](https://raw.githubusercontent.com/api-evangelist/api-stack/refs/heads/main/apis.yml): The API Evangelist APIs.json profile for API Stack.
- [Well-known probe record](https://raw.githubusercontent.com/api-evangelist/api-stack/refs/heads/main/well-known/api-stack-well-known.yml)
- [Conformance + contract discovery](https://raw.githubusercontent.com/api-evangelist/api-stack/refs/heads/main/conformance/api-stack-conformance.yml)
- [Packages](https://raw.githubusercontent.com/api-evangelist/api-stack/refs/heads/main/packages/api-stack-packages.yml)
- [Domain security](https://raw.githubusercontent.com/api-evangelist/api-stack/refs/heads/main/security/api-stack-domain-security.yml)