API Stack website screenshot

API Stack

API Stack is a free directory and discovery platform powered by Apideck that catalogs 213+ third-party API tools and services across 50+ categories including API gateways, management, design, authentication, developer portals, specifications, testing, security, monitoring, and marketplaces, helping developers discover and evaluate the right API tooling for their needs.

API Stack publishes 1 API on the APIs.io network. Tagged areas include API Design, API Directory, API Gateways, API Management, and API Monitoring.

API Stack’s developer surface includes documentation and 10 more developer resources.

20.4/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemium
1 APIs 5 Features 5 Use Cases
API DesignAPI DirectoryAPI GatewaysAPI ManagementAPI MonitoringAPI SecurityAPI TestingAPI ToolsApideckDeveloper ToolsDirectoryDiscovery

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 20.4/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 1.7 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 5.9 / 10
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 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/api-stack: 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 1

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

API Stack Directory

The API Stack Directory is a searchable catalog of 213+ API tools and services organized into 50+ categories. Each listing includes descriptions, features, pricing, screenshots,...

Pricing Plans 1

Published pricing tiers and plan structures.

Rate Limits 1

Documented rate limits and quota policies.

Api Stack Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Features 5

Notable capabilities this provider offers.

213+ Tools Catalog

Comprehensive listing of API tools and services across 50+ categories with descriptions, features, and pricing.

Category Browsing

Organized categories for browsing by API lifecycle stage including design, development, testing, security, and monitoring.

Search and Discovery

Full-text search to find specific API tools matching developer requirements.

Tool Comparison

Detailed listing pages with features, pricing, and screenshots to help compare similar tools.

Powered by Apideck

Built and maintained by Apideck as part of the broader API ecosystem alongside API Tracker and Open Banking Tracker.

Security Posture 1

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

Api Stack Domain Security

TLSv1.3 · HSTS

SECURITY

Use Cases 5

What developers build with this provider.

API Tooling Discovery

Developers and architects find and evaluate API tools across all stages of the API lifecycle.

API Gateway Selection

Compare API gateway options from open source to enterprise to find the right solution for infrastructure needs.

API Security Tool Research

Discover API security testing, authentication, and monitoring tools for securing API programs.

API Design Tool Evaluation

Explore API design tools, editors, and specification validators to improve API development workflows.

Developer Portal Platforms

Research developer portal platforms and documentation tools for publishing API programs.

Resources

Documentation 2

Reference material describing how the API behaves

Build 1

SDKs, sample code, and the tooling you integrate with

Access & Security 2

Authentication, authorization, and security posture

Company 1

The organization behind the API

Other 5

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
aid: api-stack
name: API Stack
description: API Stack is a free directory and discovery platform powered by Apideck that catalogs 213+ third-party API tools
  and services across 50+ categories including API gateways, management, design, authentication, developer portals, specifications,
  testing, security, monitoring, and marketplaces, helping developers discover and evaluate the right API tooling for their
  needs.
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
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/api-stack.png
tags:
- API Design
- API Directory
- API Gateways
- API Management
- API Monitoring
- API Security
- API Testing
- API Tools
- Apideck
- Developer Tools
- Directory
- Discovery
url: https://raw.githubusercontent.com/api-evangelist/api-stack/refs/heads/main/apis.yml
created: '2025-01-08'
modified: '2026-04-19'
specificationVersion: '0.19'
apis:
- aid: api-stack:api-stack-directory
  name: API Stack Directory
  description: The API Stack Directory is a searchable catalog of 213+ API tools and services organized into 50+ categories.
    Each listing includes descriptions, features, pricing, screenshots, and external links to help developers evaluate and
    select the right tools for their API programs.
  humanURL: https://www.apistack.io/
  tags:
  - API Directory
  - API Discovery
  - API Tools
  - Developer Tools
  properties:
  - type: Documentation
    url: https://www.apistack.io/
  - type: Categories
    url: https://www.apistack.io/categories/all
common:
- type: DomainSecurity
  url: security/api-stack-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/api-stack
- type: Website
  url: https://www.apistack.io/
- type: Categories
  url: https://www.apistack.io/categories/all
- type: APIGateways
  url: https://www.apistack.io/category/api-gateways
- type: APIManagement
  url: https://www.apistack.io/category/api-management
- type: APIDesign
  url: https://www.apistack.io/category/api-design
- type: APIAuthentication
  url: https://www.apistack.io/category/api-authentication
- type: Documentation
  url: https://www.apistack.io/category/developer-documentation
- type: APIDirectories
  url: https://www.apistack.io/category/directories
- type: APISpecifications
  url: https://www.apistack.io/category/api-specifications
- type: Features
  data:
  - name: 213+ Tools Catalog
    description: Comprehensive listing of API tools and services across 50+ categories with descriptions, features, and pricing.
  - name: Category Browsing
    description: Organized categories for browsing by API lifecycle stage including design, development, testing, security,
      and monitoring.
  - name: Search and Discovery
    description: Full-text search to find specific API tools matching developer requirements.
  - name: Tool Comparison
    description: Detailed listing pages with features, pricing, and screenshots to help compare similar tools.
  - name: Powered by Apideck
    description: Built and maintained by Apideck as part of the broader API ecosystem alongside API Tracker and Open Banking
      Tracker.
- type: UseCases
  data:
  - name: API Tooling Discovery
    description: Developers and architects find and evaluate API tools across all stages of the API lifecycle.
  - name: API Gateway Selection
    description: Compare API gateway options from open source to enterprise to find the right solution for infrastructure
      needs.
  - name: API Security Tool Research
    description: Discover API security testing, authentication, and monitoring tools for securing API programs.
  - name: API Design Tool Evaluation
    description: Explore API design tools, editors, and specification validators to improve API development workflows.
  - name: Developer Portal Platforms
    description: Research developer portal platforms and documentation tools for publishing API programs.
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com