Public APIs Directory

700+ public APIs, marketplaces, gateways, and developer tools. Discover REST APIs, rate-limit testing utilities, monitoring platforms, and comprehensive documentation resources.

We cover:

Always check API rate limits and quotas before integration
Use API gateways to centralize auth, monitoring, and rate limiting
Test with mock APIs before connecting to production endpoints
Monitor API usage with observability tools to avoid unexpected costs
Read OpenAPI/Swagger specs to understand endpoints and limits
Keep API keys secure; rotate them regularly and use scoped permissions

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API Marketplaces & Hubs

Rapid API Hub — Marketplace with per-API quotas & analytics
APILayer — High-quality commercial APIs with free tiers
Open Source APIs List — Curated list of free public APIs with categories
AnyAPI — Docs aggregator with endpoints & examples
APIList.fun — Fun & useful public APIs index
Free Public APIs (DevRes) — Categorized free API index
GitHub Topic: public-api — Discover repos exposing public APIs
NPM: openapi directories — Packages for API catalogs and schemas
Pipedream Components — Prebuilt actions; surface rate/quotas via UI
SwaggerHub Explore — Search and mock OpenAPI definitions

API Management & Gateways (Cloud)

Amazon API Gateway — Managed gateway; usage plans & throttling
Apigee (Google Cloud) — Full lifecycle management, quotas, monetization
Azure API Management — Policies, rate limits, dev portal
Kong Konnect — Hosted control plane; rate limit plugins
MuleSoft Anypoint Platform — Enterprise API mgmt & rate limiting
WSO2 Choreo / API Manager Cloud — Cloud-native API mgmt & microgateways
Red Hat 3scale — Policies, quotas, analytics
Gravitee.io — Gateway + event-native mgmt; rate limits

API Gateways (Open Source / Self‑Hosted)

Kong Gateway (OSS) — Lua/NGINX-based; plugins for limits
Tyk Gateway (OSS) — Go-based; quotas & analytics
Gravitee Gateway (OSS) — Java gateway with policies
Express Gateway — Node.js gateway; policy-based
Spring Cloud Gateway — JVM gateway; rate-limit filter
Traefik Proxy — Edge router; rate-limit middleware
Zuul (Netflix) — Edge service (archived v1, v2 internal)
Ocelot (.NET) — .NET API gateway; rate limiting
OpenResty — NGINX+Lua; implement custom limits
Kubernetes Gateway API — K8s spec for gateways & traffic

API Monitoring & Observability

Grafana Cloud — Loki, Tempo, Mimir, k6, alerts
Honeycomb — Observability for high-cardinality traces
Sentry Performance — Trace API calls & errors
Elastic Observability — Centralized logs + APM
Checkly — API checks + Playwright synthetics
UptimeRobot — Simple uptime & keyword monitoring
Pingdom — Uptime & RUM for APIs & sites
APImetrics — Third‑party API SLA tracking
Speedscale — Traffic replay & SLAs

Rate‑Limit Testing & Utilities

JSONPlaceholder — Fake REST API for testing
Webhook.site — Inspect webhooks & retries
BadSSL — TLS edge cases for clients
Artillery — Load testing for APIs
k6 — Load testing with thresholds
Locust — Python load testing
Gatling — High-performance load tests

Mock APIs & Sandboxes

Beeceptor — Intercept & mock APIs quickly
Mockoon Cloud — Local/team mock servers
MSW (Mock Service Worker) — Intercept fetch/XHR in browser/node
MockServer — Programmable HTTP/S mocks
SwaggerHub Mocking — Mock from OpenAPI in cloud
Mocki — Define endpoints & schemas
JSON Server — Turn JSON into a REST API
Faker.js (Marak's fork archived) — Generate fake data for mocks
RandomUser.me — Random user API
Fake Store API — Mock e‑commerce catalog

Auth & API Security

Auth0 — OAuth/OIDC with rate-limit guidance
Okta — Identity APIs with quotas
Firebase Auth — Google-backed identity APIs
Clerk — User mgmt & sessions
Stytch — Passwordless; fair-use limits
Ory — Open-source identity stack
Keycloak — OSS IdP for OAuth/OIDC
FusionAuth — Developer-friendly IdP
Descope — Auth flows with quotas
SuperTokens — Session management OSS
Cloudflare Turnstile — Bot mitigation without CAPTCHAs
reCAPTCHA Enterprise — Protect APIs from abuse
AWS WAF (Rate-based) — Rate-based rules for throttling

API Docs, Specs & Portals

Swagger / OpenAPI — Industry spec for REST APIs
OpenAPI Generator — Generate SDKs from OpenAPI
Redocly — Docs & governance platform
ReadMe — Developer hubs with metrics & quotas
Mintlify — Modern docs with API refs
Slate — Clean static API docs
Docusaurus — Static docs with plugins for OpenAPI
GitBook — Docs & changelogs
Swagger Editor — Browser OpenAPI editor
Fern — API SDKs & docs from schemas
Speakeasy — SDK generation + portal

API Dev Tools

Bruno — Git-friendly API client
HTTPie — Human-friendly HTTP client
Paw (RapidAPI) — macOS API client
curl — CLI for HTTP requests
HTTP Toolkit — Intercept & debug traffic
Charles Proxy — Desktop HTTP proxy
Mitmproxy — Interactive HTTPS proxy
WSL & Dev Containers — Reproducible API dev envs

Payments & Communications APIs

Stripe — Payments; per‑endpoint rate limits
PayPal — REST APIs with throttling
Square — Explicit rate limits & retries
Adyen — Payment APIs with quotas
Braintree — Payment gateway APIs
Mollie — Payments; per-token limits
Twilio — SMS/Voice; rate-limits & webhooks
SendGrid — Email API with quotas
Mailgun — Email sending & validations
MessageBird — Omnichannel messaging
Plivo — Voice & SMS API
Vonage APIs — Comms APIs with limits
WhatsApp Cloud API — Rate limits per phone number
Telegram Bot API — Per‑method/overall limits
Slack Web/API — Tiered method rate limits

Maps, Geospatial & Places

Google Maps Platform — Maps/Routes/Places; quotas & billing
Mapbox — Tiles & geocoding usage limits
HERE — REST & JS SDK with quotas
TomTom — Maps & Traffic with rate caps
OpenCage Geocoder — Forward/reverse geocoding limits
OpenStreetMap Nominatim — Strict usage policy per IP
Geoapify — Maps/geocoding with quotas
Positionstack — Geocoding API (APILayer)
Pelias — Open-source geocoder
IP Geolocation (ipapi) — IP to geo with rate tiers
MaxMind GeoIP2 Web Services — Paid geolocation quotas
Geocod.io — US/Canada geocoding API
OpenRouteService — Open routing with quotas

Weather & Environment

OpenWeather — Free tier; per‑minute/day caps
WeatherAPI.com — Requests per key per day
NOAA NWS API — US forecasts; fair use guidance
Meteostat — Historical weather; daily quotas
Open‑Meteo — Free weather forecasts; limits documented
Stormglass — Marine weather; request caps
Visual Crossing — Weather & climate datasets
Tomorrow.io — Micro‑forecasts; quotas
AirNow — Air quality; request limits
OpenAQ — Global air quality API
Windy API — Weather layers; quotas

Finance, Markets & News

Alpha Vantage — 5 req/min free; daily caps
Finnhub — Free tier with per‑minute limits
Polygon.io — WebSocket & REST limits
Yahoo Finance (RapidAPI) — 3rd‑party wrapper; hub limits
NewsAPI — Requests/day per plan
The Guardian Open Platform — Content API; key & quotas
Reddit API — Per‑user & app rate limits
Benzinga API — News & market data

AI & ML APIs

OpenAI — Token‑based limits per org/model
Anthropic — Throughput & RPM limits
Google AI Studio / Vertex AI — Quota & rate configs per model
Cohere — RPM & TPM per plan
Hugging Face Inference — Hosted models; quotas
Replicate — Per‑call pricing & limits
AssemblyAI — Speech APIs; usage limits
ElevenLabs — TTS quotas per plan
Stability AI — Image APIs; rate limits
OpenRouter — Federated LLM gateway with quotas

Commerce, E‑commerce & Transportation

Shopify Admin API — Leaky bucket rate limits
WooCommerce REST — WordPress e‑commerce API
BigCommerce — Requests per hour caps
Amazon Selling Partner API — Role‑based quotas
eBay Developers Program — Per call‑type limits
ShipEngine — Shipping labels & tracking
Amadeus for Developers — Travel APIs; per‑sec & per‑day limits
TransportAPI (UK) — Public transport data
AviationStack — Flight data; per‑minute caps
Amtrak API (Unofficial) — Transit datasets & APIs

Crypto, Sports & Open Government

CoinGecko API — Free tier, per‑minute caps
CoinMarketCap API — Paid tiers; quotas
Etherscan API — Per‑sec limits per key
Alchemy — Web3 infra with rate limits
Infura — Ethereum/IPFS with quotas
API‑FOOTBALL — Football data; per‑minute caps
TheSportsDB — Community sports data
Football‑Data.org — Free & paid tiers
US Govt. Data (Data.gov) — API key with rate limits
UK GOV.UK APIs — Directory of UK public APIs
EU Open Data Portal — APIs & datasets from EU
NASA APIs — Per‑hour/day limits per key
US Census Bureau — Data APIs with quotas

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