FastAPI website screenshot

FastAPI

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.7+ based on standard Python type hints.

FastAPI publishes 1 API on the APIs.io network. Tagged areas include Async, High Performance, OpenAPI, Pydantic, and Python.

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

FastAPI’s developer surface includes documentation, getting-started guide, changelog, support, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub
33.9/100 thin ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemium
1 APIs
AsyncHigh PerformanceOpenAPIPydanticPythonRESTSwaggerType HintsWeb Framework

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 33.9/100 · thin
Contract Quality 2.4 / 25
Developer Ergonomics 4.8 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 6.8 / 13
Governance 7.0 / 12
Discoverability 5.0 / 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/fastapi: 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.

FastAPI Framework

Modern, fast web framework for building APIs with Python based on standard Python type hints.

Pricing Plans 1

Published pricing tiers and plan structures.

Fastapi Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fastapi Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Fastapi Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

FastAPI API Rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 1

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

FastAPI Application Configuration

2 properties

JSON SCHEMA

Security Posture 1

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

Fastapi Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 3

Status, limits, changes, and where to get help

ChangeLog
ChangeLog
 Support
Support
 Community
Community

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: fastapi
name: FastAPI
description: FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.7+ based on standard
  Python type hints.
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://fastapi.tiangolo.com/img/logo-margin/logo-teal.png
url: https://raw.githubusercontent.com/api-evangelist/fastapi/refs/heads/main/apis.yml
created: '2024-01-01'
modified: '2026-04-28'
specificationVersion: '0.19'
tags:
- Async
- High Performance
- OpenAPI
- Pydantic
- Python
- REST
- Swagger
- Type Hints
- Web Framework
apis:
- aid: fastapi:fastapi
  name: FastAPI Framework
  description: Modern, fast web framework for building APIs with Python based on standard Python type hints.
  image: https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png
  humanURL: https://fastapi.tiangolo.com
  tags:
  - Async
  - OpenAPI
  - Python
  - REST
  - Web Framework
  properties:
  - type: Documentation
    url: https://fastapi.tiangolo.com
  - type: GettingStarted
    url: https://fastapi.tiangolo.com/tutorial/
  - type: ChangeLog
    url: https://fastapi.tiangolo.com/release-notes/
  - type: GitHubOrganization
    url: https://github.com/tiangolo/fastapi
  - type: JSONSchema
    url: json-schema/fastapi-app-config.json
common:
- type: DomainSecurity
  url: security/fastapi-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/fastapi
- type: Website
  url: https://fastapi.tiangolo.com
- type: Documentation
  url: https://fastapi.tiangolo.com
- type: GettingStarted
  url: https://fastapi.tiangolo.com/tutorial/
- type: ChangeLog
  url: https://fastapi.tiangolo.com/release-notes/
- type: Support
  url: https://fastapi.tiangolo.com/help-fastapi/
- type: GitHubOrganization
  url: https://github.com/tiangolo/fastapi
- type: Community
  url: https://discord.gg/VQjSZaeJmf
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com