Curated public APIs with 100% free tiers, zero paywalls, and high uptime reliability.
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| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| GroqCloud Free Tier | 🔑 Free Key | 30 req/min |
Ultra-low latency open-source LLM inference API (Llama 3.3, DeepSeek, Qwen) with a generous free developer tier. |
| Hugging Face Serverless Inference | 🔑 Free Key | Free monthly tier |
Instant serverless API access to 100,000+ open-source AI models across NLP, vision, and speech with free monthly quota. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| Cat Facts | 🟢 No Key | Unlimited |
Public REST API providing random cat facts, breeds, and trivia with zero authentication required. |
| Dog API | 🟢 No Key | Unlimited |
Free public REST API providing over 20,000 dog breed photos and random images with zero authentication required. |
| Chuck Norris Jokes API | 🟢 No Key | Unlimited |
Curated JSON API providing satirical pop-culture developer jokes and trivia with search and category filters. |
| Bored API | 🟢 No Key | Unlimited |
REST API that returns curated activity recommendations when you are bored, filterable by price and participants. |
| Advice Slip API | 🟢 No Key | Unlimited |
Simple API providing random pieces of advice and motivational suggestions with zero auth. |
| Cataas (Cat as a service) | 🟢 No Key | Unlimited |
REST API to fetch random cat pictures and GIFs, with custom text and filter overlays. |
| RandomFox API | 🟢 No Key | Unlimited |
Simple JSON API returning adorable random fox photographs and image links. |
| Shibe.Online | 🟢 No Key | Unlimited |
Public REST API providing curated photos of Shiba Inu dogs, birds, and cats. |
| JokeAPI | 🟢 No Key | 120 req/min |
Clean REST API providing programming, dark, and pun jokes with customizable category filters. |
| Bored API Mirror | 🟢 No Key | Unlimited |
Random activity generator for boredom relief with accessibility, participants, and cost filters. |
| Corporate Bullshit Generator | 🟢 No Key | Unlimited |
Random buzzword and corporate jargon phrase generator for humorous placeholders. |
| Evil Insult Generator | 🟢 No Key | Unlimited |
Humorous and sharp insults generation API for games and bot development. |
| Geek Jokes API | 🟢 No Key | Unlimited |
Curated tech jokes, programming puns, and geek culture humor returned as clean JSON. |
| Kanye Rest | 🟢 No Key | Unlimited |
Free REST API delivering memorable quotes from Kanye West as JSON with zero setup. |
| Tronald Dump API | 🟢 No Key | Unlimited |
Smart archive and quote retriever with meme tags and original source links. |
| FoxPics | 🟢 No Key | Unlimited |
Curated collection of high-resolution wild fox photos with zero rate limit. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| Open Library | 🟢 No Key | Unlimited |
Millions of book records, author bios, covers, and ISBN lookups from the Internet Archive. |
| Gutendex | 🟢 No Key | Unlimited |
Fast web API for Project Gutenberg's catalog of 70,000+ free public domain electronic books. |
| Dictionary API | 🟢 No Key | Unlimited |
Free open-source English dictionary definitions, parts of speech, phonetics, and audio pronunciations. |
| Wikipedia REST API | 🟢 No Key | 200 req/sec |
Wikimedia official REST API providing page summaries, mobile views, image transforms, and search endpoints. |
| Archive.org API | 🟢 No Key | Unlimited |
Search and retrieve millions of digitized books, movies, software, and audio files from the Internet Archive. |
| PoetryDB | 🟢 No Key | Unlimited |
An internet database of public domain poetry accessible via clean REST endpoints. |
| Quotable API | 🟢 No Key | Unlimited |
Open-source REST API for famous historical and literary quotes filterable by author and tag. |
| Open Library Covers API | 🟢 No Key | Unlimited |
Retrieve book cover images and author portraits using ISBN, OCLC, LCCN, or OLID identifiers. |
| Free Dictionary | 🟢 No Key | Unlimited |
Free developer-friendly English vocabulary API providing word origins, examples, and synonyms. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| JSONPlaceholder | 🟢 No Key | Unlimited |
Free fake REST API for prototyping, mock posts, comments, todos, and users with zero configuration. |
| ReqRes | 🟢 No Key | Unlimited |
A hosted REST-API ready to respond to your AJAX requests with simulated realistic user and auth data. |
| DummyJSON | 🟢 No Key | Unlimited |
Free dummy REST API with products, carts, users, posts, comments, auth, and image placeholder endpoints. |
| Universities List API | 🟢 No Key | Unlimited |
Public directory and queryable dataset of over 9,000 accredited universities and domains worldwide. |
| CountAPI | 🟢 No Key | Unlimited |
Free, persistent key-value counter API to track page views, hits, and downloads without creating a database. |
| Agify.io | 🟢 No Key | 1,000 req/day |
Predict someone's age from their first name based on international census records and demographic modeling. |
| Genderize.io | 🟢 No Key | 1,000 req/day |
Predict gender from first name with international probability scores and database of over 100M profiles. |
| Nationalize.io | 🟢 No Key | 1,000 req/day |
Estimate nationality and origin country probabilities from given names using statistical country data. |
| RandomUser.me | 🟢 No Key | Unlimited |
Free API for generating realistic placeholder user data with photos, names, emails, and address models. |
| Httpbin.org | 🟢 No Key | Unlimited |
HTTP client testing service with endpoints for inspecting headers, status codes, methods, and payloads. |
| RequestBin | 🟢 No Key | Unlimited |
Inspect HTTP requests and webhooks with real-time payload logging and debugging. |
| Postman Echo | 🟢 No Key | Unlimited |
Echo service to test REST clients, authorization headers, digest auth, and query parameters. |
| JSONBin.io | 🔑 Free Key | 10,000 req/mo |
Free cloud storage for JSON data, ideal for prototyping frontend applications with mock backends. |
| Mocky.io | 🟢 No Key | Unlimited |
Generate custom HTTP responses with custom bodies, headers, and status codes with zero backend setup. |
| Beeceptor | 🟢 No Key | 50 req/day |
Create mock API endpoints in 5 seconds to test incoming webhooks, payloads, and simulated responses. |
| Wikidata SPARQL API | 🟢 No Key | Unlimited |
Query Wikidata's linked open database using SPARQL queries to extract structured facts and entities. |
| QR Code Generator API | 🟢 No Key | Unlimited |
Free HTTP microservice to generate customizable high-resolution QR codes on the fly in PNG and SVG. |
| URLhaus Malware API | 🟢 No Key | Unlimited |
Malicious URL feed and threat intelligence database for automated cybersecurity scanning. |
| Have I Been Pwned Pwned Passwords | 🟢 No Key | Unlimited |
K-anonymity search API checking password hashes against billions of compromised breach credentials securely. |
| Open Source Licenses API | 🟢 No Key | 60 req/hr |
GitHub API endpoint returning metadata, permissions, and conditions for popular open source licenses. |
| Genderize API | 🟢 No Key | 1,000 req/day |
Predict gender from first name with probability scores and count statistics. |
| Agify API | 🟢 No Key | 1,000 req/day |
Predict age from first names based on statistical demographic modeling. |
| Nationalize API | 🟢 No Key | 1,000 req/day |
Predict nationality from names returning top country codes and confidence scores. |
| Public APIs Index | 🟢 No Key | Unlimited |
Queryable directory of hundreds of free public APIs categorized by topic and authentication requirements. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| CoinGecko Free API | 🔑 Free Key | 30 req/min |
Live cryptocurrency prices, market cap, historical volume, exchange stats, and ticker data. |
| ExchangeRate-API | 🔑 Free Key | 1,500 req/month |
Reliable currency conversion and forex exchange rates for 160+ currencies with a permanent free tier. |
| Frankfurter | 🟢 No Key | Unlimited |
Free and open-source foreign exchange rates and currency conversion API tracked by the European Central Bank. |
| Binlist | 🟢 No Key | 10 req/min |
Public lookup service for bank identification numbers (BIN/IIN) returning card brand, scheme, and country. |
| Coinpaprika API | 🟢 No Key | Unlimited |
Cryptocurrency market data API delivering real-time quotes, global volume, and token metadata without keys. |
| CryptoCompare API | 🔑 Free Key | 100,000 req/mo |
Enterprise-grade digital asset prices and OHLCV historical charting data with free developer tier. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| Open Food Facts | 🟢 No Key | 100 req/min |
Collaborative, open food database with over 3 million products containing barcodes, ingredients, allergens, and nutrition facts. |
| Open Brewery DB | 🟢 No Key | Unlimited |
Free public dataset and REST API for breweries, cideries, and brewpubs across the United States and globally. |
| FishWatch API | 🟢 No Key | Unlimited |
NOAA FishWatch database providing nutritional facts and sustainability data for seafood species. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| PokeAPI | 🟢 No Key | 100 req/min |
All the Pokémon data you'll ever need in one place, easily accessible through a modern RESTful API. |
| Rick and Morty API | 🟢 No Key | 10,000 req/day |
Free REST and GraphQL API providing hundreds of characters, episode guides, and location details from Rick and Morty. |
| TVMaze API | 🟢 No Key | 20 req/10sec |
TV show, episode guide, cast, and streaming schedule database accessible with zero authentication. |
| The Movie Database (TMDB) API | 🔑 Free Key | 50 req/sec |
Community-built movie and TV database with metadata, posters, trailers, and cast biographies. |
| AniList GraphQL API | 🟢 No Key | 90 req/min |
Comprehensive GraphQL API for discovering and tracking anime and manga with rich media relations. |
| Jikan API | 🟢 No Key | 60 req/min |
Open-source REST API for MyAnimeList with caching, schedule endpoints, and character detail lookups. |
| Open Trivia DB | 🟢 No Key | 1 req/5sec |
Community-driven database of multiple choice trivia questions across 24 categories and difficulty levels. |
| xkcd JSON API | 🟢 No Key | Unlimited |
Direct JSON endpoint to fetch xkcd comics, titles, transcripts, and image URLs. |
| Deck of Cards API | 🟢 No Key | Unlimited |
Simulate shuffling, dealing, and playing cards from standard 52-card decks with persistent sessions. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| ipapi.co | 🟢 No Key | 1,000 req/day |
Real-time IP geolocation and network threat intelligence API returning JSON country, city, timezone, and ASN data. |
| Rest Countries | 🟢 No Key | Unlimited |
Get detailed information about world countries (flags, borders, capitals, currencies, languages) via REST. |
| ipify | 🟢 No Key | Unlimited |
A simple public IP address API with guaranteed 99.99% uptime and zero setup. |
| Nominatim OpenStreetMap | 🟢 No Key | 1 req/sec |
Open-source search engine for OpenStreetMap data, providing forward and reverse geocoding. |
| IP-API | 🟢 No Key | 45 req/min |
Real-time IP geolocation API returning country, city, ISP, coordinates, and timezone in fast JSON format. |
| Zippopotam.us | 🟢 No Key | Unlimited |
Free postal code and zip code geographic lookup API for 60+ countries worldwide with zero authentication. |
| Geocode.xyz | 🟢 No Key | 1 req/sec |
Free batch forward and reverse geocoding API converting addresses to latitude/longitude coordinates. |
| REST Countries v3 | 🟢 No Key | Unlimited |
Detailed world geographic facts, borders, regional groupings, currencies, and languages in JSON. |
| ipinfo.io Lite | 🔑 Free Key | 50,000 req/mo |
Fast IP address geolocation, ASN company lookup, and hostname resolution with generous free tier. |
| Big Data Cloud Free IP | 🟢 No Key | Unlimited |
Reverse geocoding and IP client info API without usage limits for client-side web apps. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| RoboHash | 🟢 No Key | Unlimited |
Generate unique robot, alien, and monster avatar images for any hash, IP address, username, or text string. |
| DiceBear | 🟢 No Key | Unlimited |
Open-source avatar library and microservice for generating unique user profile avatars with 20+ design styles. |
| Meme Generator API | 🟢 No Key | Unlimited |
Returns top 100 popular meme image templates with dimensions and blank background assets. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| Hacker News Firebase API | 🟢 No Key | Unlimited |
Official Hacker News REST API powered by Firebase with real-time top stories, comments, and user profiles. |
| Dev.to API | 🔑 Free Key | 30 req/30sec |
REST API for DEV Community (Forem) accessing articles, tag listings, user feeds, and comments. |
| Reddit JSON API | 🟢 No Key | 60 req/min |
Append .json to almost any public Reddit URL to get structured JSON post data and subreddit feeds. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| NASA Open APIs | 🔑 Free Key | 1,000 req/hr |
Access imagery, mars rover photos, near earth asteroids, and astronomical telemetry data directly from NASA. |
| USGS Earthquake API | 🟢 No Key | Unlimited |
Real-time global seismic and earthquake event data from the United States Geological Survey in GeoJSON format. |
| SpaceX REST API | 🟢 No Key | Unlimited |
Open-source REST and GraphQL API for historical rocket launches, Starlink satellites, and capsule telemetry. |
| Launch Library 2 | 🟢 No Key | 15 req/hr |
Comprehensive rocket launch calendar tracking orbital missions and astronauts worldwide. |
| Solar System OpenData API | 🟢 No Key | Unlimited |
Structured database of physical and orbital characteristics for all planets, moons, and asteroids in our solar system. |
| Carbon Interface API | 🔑 Free Key | 200 req/mo |
Estimates carbon emissions from flights, electricity consumption, and shipping logistics with free tier. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| OpenSky Network API | 🟢 No Key | 100 req/day |
Live air traffic surveillance data derived from global ADS-B receiver networks tracking flights in real time. |
| API & URL | Auth | Rate Limit | Description |
|---|---|---|---|
| Open-Meteo | 🟢 No Key | 10,000 req/day |
Free weather forecast API for commercial and non-commercial use with hourly forecasts and historical weather data. |
| 7Timer! | 🟢 No Key | Unlimited |
Completely free meteorological forecasting web service based on NOAA GFS numerical models with zero auth. |
| Sunrise-Sunset.org API | 🟢 No Key | Unlimited |
Free REST API providing sunrise, sunset, day length, and solar noon times for any coordinate. |
| Open-Meteo Air Quality | 🟢 No Key | 10,000 req/day |
Hourly particulate matter (PM2.5, PM10), ozone, and European Air Quality Index forecasts with zero auth. |