API Catalog

Telegram Bot API

Messaging & Chat

Turn a Telegram bot into a free text-message channel for your business, alerts, or personal notifications.

Discord Webhooks

Messaging & Chat

Post messages automatically into a Discord channel. The easiest free notification pipe for any project.

Slack Incoming Webhooks

Messaging & Chat

Pipe notifications and alerts from any app straight into a Slack channel, free on every Slack plan.

Textbelt

Messaging & Chat

Send real text messages (SMS) from a simple web request. Free open-source version you can run yourself.

ntfy

Push Notifications

Push notifications to your phone from any script with one simple line. No signup, no cost, no key.

Gotify

Push Notifications

Your own private push-notification server. Free, open source, with Android, web, and CLI apps.

Resend

Email

Send real emails from your app or website. 3,000 free emails a month, no credit card.

SendGrid

Email

The long-running industry standard for sending email from apps. 100 free emails every day.

Brevo (formerly Sendinblue)

Email

300 free emails a day plus unlimited contacts. A generous all-in-one email and SMS platform.

Gmail API

Email

Read, search, and send your own Gmail programmatically. Free with any Google account.

Google Calendar API

Calendars & Scheduling

Create events, check availability, and manage calendars. Free with your Google account.

Cal.com API

Calendars & Scheduling

The free, open-source Calendly alternative. Bookable links and scheduling you can control with an API.

Google Sheets API

Task & Project Tools

Read and write Google Sheets from anything. The free spreadsheet-as-a-database trick.

Notion API

Task & Project Tools

Read and write your Notion pages and databases from any app. Free with a Notion account.

Airtable API

Task & Project Tools

A spreadsheet with superpowers as an API. Free for small bases and perfect for no-code projects.

Trello API

Task & Project Tools

Manage your Trello boards, cards, and lists from anywhere. Free with a Trello account.

Todoist API

Task & Project Tools

Add, complete, and manage your to-do tasks from any app. Free with a Todoist account.

ClickUp API

Task & Project Tools

Control your ClickUp tasks, docs, and projects with code. Free personal token included.

FormSubmit

Forms

Add a working contact form to any website in minutes. No backend, no account, no key.

Cloudflare Turnstile

Forms

A free, privacy-friendly CAPTCHA alternative that stops bots without annoying puzzles.

Webhook.site

Automation

Instantly get a throwaway URL to catch and inspect webhooks. Free, no signup.

n8n

Automation

The free, self-hosted Zapier alternative with 1,500+ integrations and no per-task fees.

Pipedream

Automation

Connect APIs and run code in the cloud. A generous free tier for developers.

Make (formerly Integromat)

Automation

Drag-and-drop automation connecting 3,000+ apps. 1,000 free operations a month.

GitLab REST API

Code & Repos

Manage projects, code, issues, and CI pipelines with GitLab's REST API

Codeberg API (Forgejo)

Code & Repos

Free open-source Git hosting with a GitHub-style API

jsDelivr Data API

Dev Utilities

Free metadata API for npm and GitHub packages

Shields.io

Dev Utilities

Free badges for READMEs, docs, and dashboards

UptimeRobot API

Dev Utilities

Monitor websites and get alerts when they go down

Supabase

Databases

Free Postgres database plus auth, storage, and APIs

Neon Postgres

Databases

Serverless Postgres that scales to zero. Free

Upstash Redis

Databases

Free serverless Redis for caching and queues

Cloudflare D1

Databases

SQLite database at the edge, free on Workers plan

Firebase Firestore

Databases

Google's free NoSQL database with realtime sync

Vercel REST API

Hosting & Cloud

Deploy and manage websites programmatically

Render

Hosting & Cloud

Free hosting for web apps and static sites

Backblaze B2

Hosting & Cloud

10 GB of free cloud file storage with an S3-compatible API

Groq

AI & ML

Blazing-fast free AI chat, reasoning, and transcription

Cohere

AI & ML

Free trial AI for chat, embeddings, and search

Pollinations.AI

AI & ML

Free AI text and image generation, no key needed to start

Puter.js AI

AI & ML

Use AI models from any website with zero API keys

Deepgram

Audio & Speech

$200 free credit for speech-to-text and voice AI

AssemblyAI

Audio & Speech

$50 in free credits for accurate transcription

ElevenLabs

Audio & Speech

Lifelike AI voices. 10,000 free characters a month

Cloudinary

Images & Media

Free image and video hosting with on-the-fly transforms

ImgBB

Images & Media

Dead-simple free image uploads via API

USDA FoodData Central

Nutrition & Food

Free, official U.S. government database of 1M+ foods with full nutrition labels.

Nutritionix

Nutrition & Food

Natural-language nutrition search from menus, barcodes, and everyday speech.

API Ninjas

Fitness

One free key for 90+ bite-size APIs: exercises, nutrition, and calories burned.

Free, open-source exercise library with muscle diagrams and workout plans.

Free Exercise Database

Fitness

317 exercises with 593 demo videos as free, open JSON files.

DailyMed

Medical & Drug Info

Official FDA drug labels: uses, warnings, dosages, and ingredients, free.

RxNorm (RxNav)

Medical & Drug Info

Standardize messy drug names into official clinical drug codes, free.

PubChem PUG REST

Science Data

Everything about any chemical: structure, safety, and properties, free.

ChEMBL

Science Data

Drug-like molecules and their lab-test results, curated for research.

Europe PMC

Scholarly

Search 40M+ biomedical papers: abstracts, citations, and open full text.

bioRxiv / medRxiv API

Scholarly

The newest biology and medicine research, before peer review.

CORE

Scholarly

Full-text search across 290M+ open-access research papers.

DOAJ

Scholarly

The directory of quality open-access journals and articles, free.

OpenCitations

Scholarly

Free citation data: who cited what, and how often.

Who got NIH research money, how much, and for what project.

NCBI Datasets

Science Data

Download genomes, genes, and sequences straight from the NIH.

Google Books

Books & Learning

Search the world's books: covers, previews, and metadata, free.

Search all 70,000+ free Project Gutenberg ebooks by API.

Library of Congress

Books & Learning

America's national library: books, maps, photos, and history as JSON.

Smithsonian Open Access

Science Data

Millions of museum artifacts, specimens, and images, free to reuse.

Zotero

Scholarly

Read and manage research libraries and citations by API.

iNaturalist

Science Data

200M+ wildlife sightings with photos, from citizen scientists worldwide.

eBird

Science Data

Live bird sightings, hotspots, and rare-bird alerts from Cornell Lab.

Encyclopedia of Life

Science Data

Species pages with photos, articles, traits, and conservation status.

OpenTopoData

Science Data

Free elevation for any GPS point on Earth, no key needed.

Wolfram Alpha

Books & Learning

Ask hard math, science, and data questions; get computed answers.

Open-Meteo Air Quality

Science Data

Free air-quality data: AQI, pollen, and pollutants, no key needed.

Alpha Vantage

Stocks

Free API key for stock prices, fundamentals, and technical indicators

Finnhub

Stocks

Generous free stock API with real-time-ish quotes, news, and company data

Twelve Data

Stocks

One free key for stocks, forex, crypto, ETFs, and indicators

Financial Modeling Prep

Stocks

Company financials and market data with a no-code-friendly free tier

Marketstack

Stocks

Simple stock market data API with end-of-day prices

Polygon.io

Stocks

U.S. market data API with a free delayed-data tier

Alpaca Paper Trading API

Stocks

Practice stock and crypto trading with fake money, for free

CoinPaprika

Crypto

Crypto market data with no signup and no API key

CoinCap

Crypto

Clean crypto price API with a free key, no card needed

Binance Public Market Data

Crypto

Free, no-key crypto market data from the biggest exchange

Kraken Public Spot API

Crypto

No-key crypto prices, order books, and OHLC data

DeFiLlama

Crypto

Free DeFi analytics: TVL, yields, stablecoins, and fees

CoinLore

Crypto

Dead-simple free crypto prices with zero setup

Coinbase Exchange Market Data

Crypto

Free, no-key market data from a major U.S. crypto exchange

CurrencyAPI

FX & Currency

Free currency exchange rates with a simple key

FRED API

Economic Data

Free key to the U.S. economy's official statistics

Etherscan API

Blockchain

Ethereum blockchain data with a free API key

Wise Platform Sandbox

Payments Dev

Build and test cross-border payment flows for free

Stripe API Test Mode

Payments Dev

Build and test real payment flows with fake cards, free

Plaid Sandbox

Payments Dev

Free test bank data for fintech apps, no real accounts needed

U.S. Census Data API

US Government Data

Population, income, housing, and business stats straight from the U.S. Census Bureau.

BLS Public Data API

US Government Data

Unemployment rates, job growth, and inflation data from the Bureau of Labor Statistics.

Congress.gov API

US Government Data

Official Library of Congress data on bills, votes, members, and committees.

OpenFEC

US Government Data

Who gave money to whom in federal elections, from the Federal Election Commission.

Regulations.gov API

US Government Data

Search federal rules, dockets, and public comments as they're being made.

SEC EDGAR Data APIs

US Government Data

Every corporate filing from the SEC: annual reports, insider trades, and financial statements.

U.S. energy stats: gas prices, electricity, oil, renewables, and emissions.

GovInfo API

Civic & Legal

Official U.S. laws, bills, the Congressional Record, and Federal Register in one API.

CourtListener API

Civic & Legal

Millions of U.S. court opinions, dockets, judges, and oral arguments.

Open States API v3

Civic & Legal

Every state legislature: bills, votes, and lawmakers in all 50 states.

ProPublica Nonprofit Explorer API v2

Civic & Legal

Search 1.8 million U.S. nonprofits and read their IRS filings.

USAJOBS Search API

Jobs & Careers

Search every federal government job opening with filters and salary data.

O*NET Web Services

Jobs & Careers

The Department of Labor's official occupation database: skills, pay, and career paths.

Remotive Remote Jobs API

Jobs & Careers

Curated remote job listings you can pull with zero signup.

Arbeitnow Job Board API

Jobs & Careers

Free European job listings, including remote and visa-sponsorship roles.

ThreatFox

Threat Intel

Check whether an IP, domain, or URL is a known malware threat.

MalwareBazaar

Threat Intel

Look up malware samples by file hash and see what they do.

GreyNoise Community API

Threat Intel

Is this IP just internet background noise or actually targeting you?

AbuseIPDB

Threat Intel

Community-reported IP abuse scores: is this IP a spammer, scanner, or bot?

urlscan.io

Threat Intel

Scan a suspicious URL in a sandbox and see everything it does.

Cloudflare DNS over HTTPS

Network & IP Intel

Look up any domain's DNS records over encrypted HTTPS, no key needed.

Google Public DNS over HTTPS

Network & IP Intel

Google's free JSON API for DNS lookups with DNSSEC validation.

IPinfo

Network & IP Intel

Turn any IP address into a location, ISP, and company name.

SSL Labs Server Test API

Network & IP Intel

Grade any website's HTTPS security from A to F, free.

NewsAPI.org

News

Headlines and articles from 80,000+ sources in one request

NewsData.io

News

Global news from 90,000+ sources in 89 languages

GNews API

News

Google-News-style headlines, any language, any country

The Guardian Open Platform

News

Search The Guardian's entire archive back to 1999

Hacker News API

News

Tech's front page, live, no signup

Lobsters

News

A quiet, high-signal tech discussion board

Currents API

News

Fresh global headlines with no artificial delay

Reddit Data API

Social & Community

Every public Reddit post and comment, on tap

DEV Community (Forem) API

Social & Community

Millions of programmer articles. Read them, publish with them

Brave Search API

Web Search

Real web results from an independent search index

Exa AI Search

Web Search

Search that understands meaning, built for AI

Tavily

Web Search

Search and page extraction tuned for AI agents

Serper

Web Search

Google results as clean JSON in about a second

Apify

Scraping & Extraction

Run thousands of ready-made scrapers in the cloud

TinyURL

Link Tools

The classic short-link maker, no signup needed

is.gd

Link Tools

Tiny links, custom names, and click stats. No account

Shorten a link with a single POST, nothing to install

goQR (QRServer)

Link Tools

Make QR codes. Or read them. With one URL

eBay Browse API

Ecommerce Dev

Search all of eBay's live listings from your app

Etsy Open API v3

Ecommerce Dev

Run your Etsy shop from code

NOAA National Weather Service API

Weather

America's official weather forecast, straight from the government.

OpenWeather

Weather

Current weather and 5-day forecasts for anywhere on Earth.

WeatherAPI.com

Weather

Weather, alerts, astronomy, and time zones in one simple call.

Minute-by-minute weather built for app developers.

Visual Crossing

Weather

Past, present, and future weather from one timeline endpoint.

World Air Quality Index (WAQI)

Weather

Live air quality from thousands of monitoring stations worldwide.

OpenUV

Weather

Global UV index plus safe sun-exposure guidance.

OpenRouteService

Routing

Turn-by-turn routes for driving, cycling, walking. And wheelchairs.

Photon

Maps & Geocoding

Instant place search powered by OpenStreetMap. No signup.

Geoapify

Maps & Geocoding

Geocoding, routing, places, and map tiles under one generous free plan.

Overpass API

Maps & Geocoding

Ask the world's map any question. Cafes, parks, EV chargers.

GeoNames

Maps & Geocoding

A giant free gazetteer: places, postcodes, elevation, time zones.

Open Topo Data

Maps & Geocoding

Free elevation for any point on Earth. No signup.

MapTiler Cloud

Maps & Geocoding

Beautiful map tiles, geocoding, and elevation. 100k free requests a month.

Stadia Maps

Maps & Geocoding

Map tiles, geocoding, and routing from a privacy-friendly provider.

Transitland

Transit

Bus and train stops, routes, and schedules from around the world.

OpenSky Network

Flights

Live aircraft positions from a volunteer sensor network.

AviationStack

Flights

Real-time flight status, airports, and airlines in plain JSON.

Tourist attractions and points of interest from open data.

TimeZoneDB

Time & Location

What time is it there? Exact answers by place, coordinates, or IP.

IPGeolocation.io

Time & Location

IP location plus currency, languages, and time zone in one call.

TMDB (The Movie Database) API

Movies & TV

The world's most popular community-built database of movies, TV shows, and actors, with a full developer API.

OMDb (Open Movie Database) API

Movies & TV

A simple movie database API that also brings in IMDb, Rotten Tomatoes, and Metacritic ratings in one call.

TVMaze API

Movies & TV

A completely free, no-signup database of TV shows, episodes, schedules, and cast information.

Jikan API

Anime

A free unofficial doorway into MyAnimeList, the biggest anime and manga database on the internet.

AniList API

Anime

The official API of AniList, a modern anime and manga tracking community, covering 500k+ entries.

Kitsu API

Anime

A free API from Kitsu, a social anime discovery platform with anime, manga, characters, and community data.

Spotify Web API

Music

Official access to Spotify's music catalog: search, artist and album details, playlists, and playback control.

Deezer API

Music

A key-free REST API for searching tracks, albums, artists, and playlists from the Deezer music catalog.

Last.fm API

Music

Tap into Last.fm's listening data: top artists, top tracks, similar artists, tags, and user listening histories.

Listen Notes API

Podcasts

Search nearly every podcast in existence by topic, guest, or keyword.

Podcast Index API

Podcasts

A free, community-run catalog of over 4 million podcasts you can search and browse.

IGDB API

Games

The Wikipedia of video games. Details, covers, ratings, and trailers for nearly every game.

RAWG API

Games

A giant searchable library of 500,000+ games with ratings, screenshots, and where to buy them.

CheapShark API

Games

Find the cheapest price for any PC game across 70+ stores. No sign-up, no key, just ask.

Steam Web API

Games

Official Steam data: game news, player stats, owned games, and achievements straight from Valve.

FreeToGame API

Games

A catalog of 400+ free-to-play games. No key, no account, just ask.

API-Football

Sports

Live scores, fixtures, standings, and stats for 1,000+ football leagues worldwide.

MLB Stats API

Sports

Official Major League Baseball stats, schedules, and live scores. Free, no key required.

NHL API

Sports

Official NHL hockey data. Scores, schedules, rosters, and player stats. Free with no key.

OpenLigaDB

Sports

Free community football data focused on German leagues. Scores, tables, and fixtures, no key.

Bored API

Fun & Random

Gives you a random real-world activity suggestion whenever you're bored.

RandomUser.me

Fun & Random

Generates realistic fake user profiles with names, photos, and contact details for testing.

Serves up random cat facts and a catalog of cat breeds.

Dog Facts

Fun & Random

Returns random dog facts on demand with no signup.

Chuck Norris Jokes

Fun & Random

A free library of hand-curated Chuck Norris jokes with search and categories.

Kanye Rest

Fun & Random

Returns a random Kanye West quote every time you ask.

Agify.io

Fun & Random

Guesses a person's age from their first name.

DiceBear Avatars

Avatars & Images

Generates fun cartoon avatars from any word or username. No signup needed.

Makes clean initials-based avatars for any name, instantly.

Free placeholder photos at any size, straight from a URL.

mathjs API

Utilities

Solves math expressions through a simple web request. A free online calculator API.

goQR

Utilities

Creates QR codes from any text or link. No signup, just a URL.

The Color API

Utilities

The Color API identifies any color: give it a hex code, get its name and full color data.

icanhazdadjoke

Fun & Random

An endless supply of groan-worthy dad jokes, one request at a time.

JokeAPI v2

Fun & Random

Hundreds of categorized jokes with a family-friendly filter built in.

Useless Facts

Fun & Random

Random 'did you know?' facts that are useless but fun.

Advice Slip

Fun & Random

Random pieces of life advice, from wise to wonderfully weird.

Yes/No

Fun & Random

Answers yes or no to anything - with a perfectly matched GIF.

Playfully brutal insults for roasting your friends (lovingly).

Bacon Ipsum

Fun & Random

Filler text made of delicious meats instead of boring Latin.

ZenQuotes

Fun & Random

Inspirational quotes from famous thinkers, ready to display.

Random.org

Fun & Random

Truly random numbers, coin flips, and dice rolls from atmospheric noise.

XKCD

Fun & Random

The beloved geek webcomic, fetchable comic by comic.

ColourLovers

Fun & Random

Millions of community-made color palettes, searchable by mood.

Dog CEO

Avatars & Images

Random dog photos by the thousands, organized by breed.

Cataas

Avatars & Images

Cat pictures as a service - with captions, filters, and GIFs.

HTTP Cats

Avatars & Images

A cat photo for every web error code - 404 has never been cuter.

RoboHash

Avatars & Images

Unique robot (or monster, or cat) avatars generated from any text.

Placehold.co

Avatars & Images

Instant placeholder images in any size, color, and format.

Thousands of free trivia questions across every category.

Deck of Cards

Games

A full deck of cards in the cloud - shuffle, draw, and play.

Chess.com

Games

Player profiles, game archives, leaderboards, and the daily puzzle.

Lichess

Games

Free chess puzzles, player data, and game exports from lichess.org.

D&D 5e API

Games

Every D&D monster, spell, class, and magic item - free to query.

Scryfall

Games

The complete Magic: The Gathering card database with prices.

PokeAPI

Games

Every Pokemon, move, item, and game detail - the internet's Pokedex.

Pokemon TCG

Games

Every Pokemon trading card with images, prices, and set info.

MusicBrainz

Music

The Wikipedia of music metadata - artists, albums, and songs.

iTunes Search

Music

Search Apple's catalog: music, podcasts, apps, movies, and more.

Lyrics.ovh

Music

Song lyrics with one simple request - no key, no fuss.

Radio Browser

Music

30,000+ free internet radio stations from around the world.

QuickChart

Utilities

Charts, QR codes, and graphs generated from a simple URL.

ipify

Utilities

Find out your public IP address in one tiny request.

JSONPlaceholder

Utilities

Fake posts, users, and comments for testing your app ideas.

Free Dictionary

Books & Learning

Definitions, pronunciations, and examples for any English word.

Find rhymes, synonyms, and words that fit - a writer's API.

HubSpot CRM

Business Operations

Free CRM with a full developer API

Zoho CRM

Business Operations

Free CRM for three users with REST API access

Attio

Business Operations

Modern CRM with a free plan and REST API

Freshsales

Business Operations

Freshworks CRM with free-trial API access

Zoho Recruit

Business Operations

Recruiting software with free plan and APIs

BambooHR

Business Operations

HR platform with free trial and developer sandbox

Zoho Invoice

Business Operations

Free invoicing app with a current API

Invoice Ninja

Business Operations

Open-source invoicing with a free self-hosted API

FreshBooks

Business Operations

Accounting API on a 30-day no-card trial

Xero

Business Operations

Accounting API with a free developer account

QuickBooks Online

Business Operations

Accounting API with free developer sandboxes

DocuSign

Business Operations

E-signature API with a free developer sandbox

Zoho Sign

Business Operations

E-signature API on a 14-day trial

PandaDoc

Business Operations

Document API with a free sandbox

Crisp

Business Operations

Live chat API with a free forever plan

Freshdesk

Business Operations

Support ticketing API with free trial

Chatwoot

Business Operations

Open-source support platform with free self-hosting

Clockify

Business Operations

Time tracking API free forever

Toggl Track

Business Operations

Simple time tracking API on a free plan

Harvest

Business Operations

Time tracking API with a free solo plan

Deputy

Business Operations

Shift scheduling API on a developer trial

Asana

Business Operations

Project management API on a free Personal plan

Jira Cloud

Business Operations

Issue tracking API on free cloud sites

Coda (Superhuman Docs)

Business Operations

Doc API free in free and paid workspaces

GitBook

Business Operations

Documentation platform API with free signup

Instagram Graph API

Marketing & SEO

Publish posts and read insights from an Instagram business or creator account, right from your code.

Threads API

Marketing & SEO

Post to Threads and read profile stats programmatically through Meta's official API.

Mastodon API

Marketing & SEO

Post, schedule, and read engagement data on any Mastodon server through its open API.

Bluesky (AT Protocol)

Marketing & SEO

Publish posts and read the firehose on Bluesky with a free account and an app password.

Pinterest API v5

Marketing & SEO

Create pins and manage boards programmatically, starting in a free sandbox.

YouTube Data API v3

Marketing & SEO

Search videos, read channel stats, and manage uploads through Google's official YouTube API.

Google Search Console API

Marketing & SEO

Pull your site's Google search clicks, impressions, and rankings into any report.

Google Analytics Data API (GA4)

Marketing & SEO

Query your GA4 reports, realtime data, and funnels from code for custom dashboards.

Microsoft Clarity Data Export API

Marketing & SEO

Export heatmap-style engagement stats (rage clicks, scrolls, referrers) as data, free.

PostHog

Marketing & SEO

Free product analytics, session replays, A/B tests, and surveys in one open platform.

Tally API

Forms

Unlimited free forms and submissions, plus a full API on every plan.

Jotform API

Forms

Read, create, and manage Jotform forms and submissions programmatically.

MailerLite API

Email

Manage subscribers, campaigns, and automations for your newsletter via API.

Kit (ConvertKit) API v4

Email

Creator-focused email API for subscribers, tags, forms, and sequences.

Loops

Email

Marketing, lifecycle, and transactional email from one simple API.

Hunter API

Marketing & SEO

Find and verify professional email addresses behind any company domain.

Botpress

Marketing & SEO

Build AI chatbots and agents with a visual builder, free to start.

Retell AI

Marketing & SEO

Launch AI voice agents that call and answer, with free trial credits.

Vapi

Marketing & SEO

Build and deploy AI phone agents with $10 in free starter credits.

OneSignal

Marketing & SEO

Free push notifications, in-app messages, and email for apps and sites.

Novu

Marketing & SEO

One API for email, SMS, push, and in-app notifications, 10K events free.

GoAffPro

Marketing & SEO

Launch a free affiliate program with unlimited affiliates and tracked sales.

Postiz

Marketing & SEO

Open-source social scheduling with a public API; hosted trial or free self-host.

Unbounce

Marketing & SEO

Build and A/B test landing pages, with an API for pages and leads.

Mailchimp Marketing API

Email

The familiar email platform's full API for audiences, campaigns, and automations.

beehiiv API

Email

Grow a newsletter with a clean API for subscribers, segments, and posts.

Google Ads API

Marketing & SEO

Manage Google Ads campaigns and reports via API, free to learn with test accounts.

Tiingo

Stocks

Generous free tier for EOD prices, crypto, FX, and news

Tradier Developer Sandbox

Stocks

Free sandbox for delayed market data and paper trading

EODHD

Stocks

Free daily global stock data for testing and evaluation

Charles Schwab Trader API (Individual)

Stocks

Official Schwab quotes, options, and trading for individuals

Marketaux

Stocks

Financial news API with ticker, sentiment, and entity filters

OANDA v20 REST API

FX & Currency

FX market data and simulated trading with a free practice account

Frankfurter v2

FX & Currency

Free, keyless daily exchange rates from official sources

Open Exchange Rates

FX & Currency

Hourly FX rates with a forever-free plan

ExchangeRate-API v6

FX & Currency

Simple FX rates with a free 1,500-request monthly plan

CoinGecko Demo API

Crypto

The classic free crypto price and market-data API

CoinMarketCap Pro API

Crypto

Rankings and prices for 10,000+ tokens on a free plan

OKX API V5

Crypto

Free keyless market data from a top global exchange

Bybit V5 API

Crypto

Keyless crypto derivatives market data plus a free testnet

KuCoin API

Crypto

Keyless spot and futures market data via a weighted pool

Hyperliquid Info API

Crypto

Keyless on-chain perps and order-book data from a DEX

Crypto Fear & Greed Index (alternative.me)

Crypto

Daily crypto sentiment score, free and keyless

Alchemy

Blockchain

Free Web3 infrastructure with 30M monthly compute units

Ankr Web3 API

Blockchain

Multi-chain RPC plus indexed token and NFT data on a free plan

U.S. Treasury Fiscal Data API

Economic Data

Official U.S. fiscal data: debt, rates, auctions, spending

World Bank Indicators API v2

Economic Data

1,000+ country development indicators, keyless

OECD Data Explorer API

Economic Data

Keyless OECD stats: labor, taxes, inequality, productivity

PayPal Sandbox

Payments Dev

Full test environment for PayPal payments and payouts

Square Sandbox

Payments Dev

Isolated test sandbox for Square payments and commerce APIs

Braintree Sandbox

Payments Dev

Free test account for card and wallet payment processing

YNAB API

Banking & Budgeting

Official API for budgets, accounts, and transactions

Actual Budget API

Banking & Budgeting

Open-source self-hosted budgeting with a real API

Strava API

Fitness

Workout tracking data from runs, rides, and swims.

Polar AccessLink

Fitness

Heart rate, training, activity, and sleep data from Polar devices.

Withings API

Fitness

Weight, sleep, activity, and heart data from Withings devices.

Oura API v2

Fitness

Sleep, readiness, and recovery data from your Oura ring.

WHOOP API

Fitness

Recovery, sleep, and strain data from WHOOP.

Intervals.icu API

Fitness

Deep training analytics for cyclists, runners, and triathletes.

Open Food Facts

Nutrition & Food

Free, crowdsourced food product database with barcode lookup.

TheMealDB

Nutrition & Food

Free recipe and meal database with simple search.

FatSecret Platform API

Nutrition & Food

Food, recipe, and exercise database for nutrition apps.

Spoonacular

Nutrition & Food

Recipes, nutrition analysis, and meal planning.

Beeminder API

Automation

Commitment contracts that charge you if you miss your goal.

Home Assistant REST API

Smart Home

Control your own smart home server over a local API.

SwitchBot Open API v1.1

Smart Home

Control SwitchBot devices: bots, plugs, curtains, and locks.

Shelly Device APIs

Smart Home

Local control of Shelly smart relays and sensors.

Philips Hue API v2

Smart Home

Control Philips Hue lights, rooms, and scenes.

Hardcover API

Books & Learning

Book tracking, shelves, and reading stats via GraphQL.

Wiktionary API

Books & Learning

Dictionary definitions and language data, for free.

OpenFDA

Medical & Drug Info

FDA data on drugs, devices, recalls, and adverse events.

TheCatAPI

Fun & Random

Cat images, breeds, and facts. Delightfully simple.

Appwrite

Databases

Open-source backend with database, auth, storage, and functions in one.

PocketBase

Databases

One-file backend with database, auth, and file storage built in.

Meilisearch

Databases

Blazing-fast open-source search engine you host yourself for free.

Typesense

Databases

Open-source typo-tolerant search with a one-time free cloud allowance.

Strapi

Databases

Free open-source headless CMS with auto-generated REST and GraphQL APIs.

Contentful

Databases

Hosted headless CMS with a genuinely useful free plan.

Cloudflare R2

Hosting & Cloud

Object storage with 10 GB free monthly and zero egress fees.

Cloudflare Workers

Hosting & Cloud

Serverless functions on Cloudflare's edge, 100,000 requests a day free.

Netlify Functions

Hosting & Cloud

Serverless functions deployed alongside your site, free every month.

Shopify

Ecommerce Dev

Free unlimited development stores for building and testing apps.

Medusa

Ecommerce Dev

Free open-source headless commerce backend with Store and Admin APIs.

Gumroad

Payments Dev

Verify software licenses and sell digital products via a simple API.

Lemon Squeezy

Payments Dev

Test the full payments API free in Test Mode before going live.

Auth0

Auth & Identity

Enterprise-grade login free for up to 25,000 monthly users.

Kinde

Auth & Identity

Modern auth free forever for 10,500 monthly users, no card.

Stytch

Auth & Identity

Passwordless-first auth free for 10,000 active users.

Clerk

Auth & Identity

Drop-in login and user management free for 50,000 returning users.

SuperTokens

Auth & Identity

Open-source auth core free forever; managed cloud free under 5,000 users.

Logto

Auth & Identity

Open-source identity platform free for 50,000 monthly users.

Firebase Authentication

Auth & Identity

Google's login service free for 50,000 monthly users.

Flagsmith

Dev Utilities

Feature flags free for 50,000 requests a month, unlimited self-hosted.

ConfigCat

Dev Utilities

Forever-free feature flags, no credit card, unlimited team seats.

Unleash

Dev Utilities

Most popular open-source feature-flag server, free to self-host.

Svix

Automation

Webhooks-as-a-service so you never build retry logic again.

Axiom

Dev Utilities

Log analytics and monitoring with a generous always-free tier.

Ably

Automation

Realtime messaging API with a free plan, no card, no time limit.

Pusher

Automation

Realtime WebSocket events with a free sandbox for development.

Infisical

Dev Utilities

Open-source secrets manager, free to self-host or use in the cloud.

OpenBao

Dev Utilities

Free open-source Vault-compatible secrets server you run yourself.

ImageKit

Images & Media

Image and video CDN free forever, no card, 20 GB bandwidth monthly.

Uploadcare

Images & Media

File upload widget and CDN free for personal projects.

100ms

Voice & Video

Drop Zoom-quality video calls, livestreams, and webinars straight into your app with a no-card free plan.

Agora Video Calling

Voice & Video

Battle-tested video, voice, and live chat behind apps like Clubhouse. 10,000 free minutes a month.

LiveKit Cloud

Voice & Video

Open-source video/voice rooms with 5,000 free participant-minutes a month and 100 simultaneous users.

Dyte

Voice & Video

10,000 free video minutes a month with a one-line meeting link or full API control.

Daily

Voice & Video

Video calls from a simple link. Free no-card plan with 10,000 participant-minutes a month.

Zoom Video SDK

Voice & Video

Put Zoom's famous call quality inside your own app. Free monthly credits included.

Bandwidth Build Voice API

Voice & Video

A no-card voice trial: a real US phone number, 3,000 credits, and programmable calls.

Twilio Programmable Messaging/Voice

Messaging & Chat

The famous texting-and-calling API. Free trial credit and a trial phone number, no card.

Twilio Verify

Messaging & Chat

Login codes by text, voice, email, or WhatsApp. OTP verification without building the plumbing.

Vonage APIs

Messaging & Chat

€2 of free trial credit for texts, calls, and verification. No credit card needed.

Plivo

Messaging & Chat

Developer-friendly texting, calling, and verification with free trial credits.

Telnyx

Messaging & Chat

High-quality calls, texts, and phone numbers on Telnyx's private network. Trial credit included.

SignalWire

Messaging & Chat

$5 free trial for calls, texts, fax, video, and AI voice agents on one platform.

Bird (MessageBird) SMS API

Messaging & Chat

10 free test texts to try MessageBird's global SMS platform. Verified number only.

Sinch Conversation API

Messaging & Chat

One API for SMS, WhatsApp, RCS, and MMS. No-card trial credit to start.

Meta WhatsApp Business Platform

Messaging & Chat

Message customers on WhatsApp with 1,000 free service messages a month per number.

Sendbird Chat

Messaging & Chat

In-app chat for your product. 100 free monthly users with moderation built in.

CometChat

Messaging & Chat

Chat, voice, and video widgets for your app. Free Build plan for up to 100 users.

PubNub

Messaging & Chat

The realtime delivery network behind live chat, live tracking, and multiplayer. 200 free users.

Stream Chat

Messaging & Chat

Polished in-app messaging with free build access and a Maker program for small teams.

Zulip

Messaging & Chat

Threaded team chat that's actually free. 10,000 searchable messages on the hosted plan.

Firebase Cloud Messaging

Push Notifications

Google's free push notification service. Unlimited notifications on every Firebase plan.

Pusher Beams

Push Notifications

Reliable push notifications for 1,000 subscribers on the free Sandbox plan.

Expo Push Service

Push Notifications

Free push notifications for React Native apps. No Apple or Google server keys needed.

Postmark

Email

Transactional email that lands in inboxes. 100 free emails a month, forever.

Mailjet

Email

6,000 free emails a month (200/day) with a drag-and-drop template builder.

Mailtrap

Email

Test emails safely, then send for real. $0-forever plan with 4,000 emails a month.

Better Stack

Utilities

Uptime monitoring, incident alerts, and a public status page. 10 monitors free.

Atlassian Statuspage

Utilities

The industry-standard status page. Free for 100 subscribers and 25 components.

Cronitor

Utilities

Uptime checks plus cron-job monitoring. 5 monitors free, with a status page.

Hyperping

Utilities

20 free monitors with a public status page. No credit card, no time limit.

OpenStatus

Utilities

A simple, open-source status page and monitor. Free forever, no card.

NASA Open APIs

Science Data

One key unlocks NASA's space and Earth science APIs.

Open Notify

Science Data

Where is the International Space Station right now?

Every rocket launch, past and future, in one feed.

AstronomyAPI

Science Data

Planet positions, moon phases, and star charts by API.

Sunrise-Sunset.org

Time & Location

Exact sunrise, sunset, and golden-hour times for any place.

Open-Meteo Marine

Weather

Waves, tides, and sea conditions for any coastline.

UK Carbon Intensity API

Environment & Climate

How clean is Britain's electricity right now?

Elexon BMRS Insights

Environment & Climate

Britain's live electricity market and grid data.

ENTSO-E Transparency Platform

Environment & Climate

Official electricity data for Europe's power grid.

USGS Earthquake Catalog

Environment & Climate

Every recorded earthquake, searchable worldwide.

EMSC Seismic Portal

Environment & Climate

Europe's real-time earthquake monitoring feed.

Billions of species observations, worldwide.

OBIS

Environment & Climate

Where marine life has been found, mapped.

Xeno-canto

Environment & Climate

Hundreds of thousands of bird songs, searchable.

OpenAQ v3

Environment & Climate

Global air quality measurements, one key away.

Copernicus Climate Data Store

Environment & Climate

The EU's climate archive, from 1940 to today.

ECMWF Open Data

Environment & Climate

Raw global forecast data from Europe's weather supercomputer.

EEA Air Quality Download Service

Environment & Climate

Europe's official air-quality record, 2013 to today.

SoilGrids

Environment & Climate

What's in the ground, anywhere on Earth.

DEFRA UK-AIR

Environment & Climate

Britain's official air-pollution monitoring network.

Eurostat Statistics API

Economic Data

Official statistics for the EU, queryable.

GLEIF LEI API

Economic Data

Verify any company's official global ID.

UK Parliament Members API

Civic & Legal

Every UK MP and Lord, searchable.

UK Police Data API

Civic & Legal

Street-level crime data for England, Wales, and Northern Ireland.

Danish Parliament Open Data

Civic & Legal

Denmark's parliament, as open data.

Companies House Public Data API

Civic & Legal

Every UK company, officer, and filing. Searchable.

Canada's official statistics, downloadable.

data.europa.eu

Civic & Legal

All of Europe's open data, one query language.

Transport for London Unified API

Transit

Live London transport status, arrivals, and journeys.

Intrinio Developer Sandbox / Free Trial

Stocks

Institutional-grade financial data with a startup free trial

IMF Data API

Economic Data

Keyless IMF macro datasets: outlook, rates, financial stats

ECB Data Portal API

Economic Data

Official euro-area monetary and exchange-rate statistics

Habitica API v3

Automation

Gamified habits, dailies, and to-dos with RPG rewards.

Tasks, lists, and reminders synced with your to-do list.

Petfinder API

Fun & Random

Search adoptable pets and shelters near you.

NOAA CO-OPS Tides & Currents

Environment & Climate

Official US tide predictions and water levels.

data.gouv.fr

Civic & Legal

France's public data, one search away.

Mem0

AI & ML

Long-term memory for AI agents and chatbots

Langfuse

AI & ML

Open-source observability for LLM apps

E2B

Dev Utilities

Secure cloud sandboxes for running AI-generated code

Composio

AI & ML

200+ app integrations your agent can call as tools

Helicone

AI & ML

LLM observability plus a gateway to 100+ models

Inngest

Dev Utilities

Durable background jobs and workflows for apps

Jina AI Reader

Web Search

Turn any web page into clean text for your agent

Firecrawl

Web Search

Web scraping built for AI agents, with an MCP server

Daytona

Dev Utilities

Instant dev environments and agent desktops in the cloud

Modal

Hosting & Cloud

Serverless compute with $30 in free credits every month

Fish Audio

Voice & Video

High-quality text-to-speech with a real free tier

Hugging Face Inference

AI & ML

Free serverless inference on thousands of open models

OpenAlex

Scholarly

Free scholarly database: 250M+ works, no key needed

Qdrant

Databases

Rust-fast vector search, free cloud cluster forever

LLM7.io

AI & ML

Free LLM API with no signup, no key, and no card. Just call it.

OpenTyphoon

AI & ML

Free OpenAI-compatible LLM, OCR, and speech API. One key, no card.

Cerebras

AI & ML

The fastest free LLM inference tier. About 1M tokens a day, no card.

NVIDIA NIM

AI & ML

One free key for 120+ open models: chat, embeddings, vision, audio.

Frostbyte Agent Gateway

Dev Utilities

40+ agent-ready services behind one API key. 50 free calls a day.

Context7 MCP

MCP Servers

Pipe fresh, version-specific docs straight into your agent.

Playwright MCP

MCP Servers

Give your agent a real browser it can click and type in.

MCP Reference Servers

MCP Servers

The canonical starter toolkit: filesystem, git, fetch, memory, SQLite.

OpenAI Agents SDK

Agent Templates

Production-ready agent starters you can copy and extend. MIT.

LangGraph Project Template

Agent Templates

The official LangGraph starter with a visual debugger.

Promptfoo

Eval & Testing

Test your agent before it embarrasses you. YAML evals plus red-teaming.

NeMo Guardrails

Guardrails

Programmable safety rails for inputs, outputs, and tool calls.

Claude Skills Pack

Agent Skills

388 drop-in skill packs that give coding agents instant expertise.

Letta

Memory

Give your agent real memory across sessions. MemGPT's successor.

DSPy

Frameworks

Program agents declaratively. Let the optimizer tune the prompts.

Google AI Studio (Gemini API)

AI & ML

Google's flagship AI models, free with a 1,500-request daily quota.

Mistral AI La Plateforme

AI & ML

Hosted Mistral models with native function calling, free with no card.

Ollama Cloud

AI & ML

Hosted open models with tool calling, free with no card or phone.

SambaNova Cloud

AI & ML

Blazing-fast inference on Llama, DeepSeek, and Qwen, free with no card.

OVHcloud AI Endpoints

AI & ML

Call 20+ open models with no signup, no key, and no card.

Alibaba DashScope

AI & ML

A million free Qwen tokens with a mode that cannot bill you by accident.

Zhipu AI BigModel

AI & ML

Frontier-class GLM models priced free, not a trial.

Cloudflare Workers AI

AI & ML

Daily free edge inference for LLMs, embeddings, image, and audio.

DeepEval

Eval & Testing

Open-source LLM eval harness with metrics, datasets, and CI integration.

Inspect AI

Eval & Testing

MIT eval framework with 200+ pre-built tests for agents.

skills.sh

Agent Skills

The registry for agent skills. One command to teach your agent.

open-multi-agent

Agent Frameworks

Multi-agent teams with approval checkpoints and audit trails.

Steel

Browser Automation

Self-hosted browser API for agents. One docker run, zero bills.

Browserbase

Browser Automation

Headless browsers built for agents, with a free Start tier.

Turso

Database & Vector

Edge SQLite with vector search for agent memory. Free, no card.

MyMemory Translation

Utilities

Translate text between 100+ languages, no key needed.

Microlink

Link Tools

Turn any URL into a screenshot, preview card, or PDF.

Nager.Date Public Holidays

Calendars & Scheduling

Public holidays for 100+ countries, keyless.

Open Library

Books & Learning

Look up any book by ISBN, title, or author.

ESPN Scoreboard

Sports

Live sports scores with zero setup.

Aladhan Prayer Times

Calendars & Scheduling

Prayer times by city, keyless.

Pexels API

Images & Media

Free stock photos and videos, key with no card.

ip-api.com

Network & IP Intel

Where an IP address is located, in one call.

NHTSA vPIC

Utilities

Decode any VIN and check recalls, official US data.

Art Institute of Chicago

Images & Media

130,000+ artworks with images, searchable in plain language.

Met Museum Collection

Images & Media

470,000+ art objects, keyless.

UPCitemdb

Utilities

Scan a barcode, get the product.

Abstract Email Validation

Email

Check whether an email address is real.

Turn an address into map coordinates, keyless.

CityBikes

Transit

Bike-share stations and bike counts worldwide, keyless.

Full poem texts by title or author, keyless.

One call, one affirmation.

Today in History (MuffinLabs)

Fun & Random

Births, deaths, and events for any date.

Meme API

Fun & Random

Random fresh memes from Reddit, one call.

EmojiHub

Fun & Random

Random emoji or the full emoji catalog as data.

Agent-Reach

Agent Frameworks

One free interface for agents to read and search the web.

google/ax

Agent Frameworks

Google's declarative runtime for orchestrating agent workloads.

Orca

Agent Frameworks

Run coding agent teams in parallel, merge the winner.

OpenRig

Agent Frameworks

Persistent multi-agent teams declared in YAML.

MiniMax Code CLI

Agent Frameworks

Terminal coding agent with BYOK for free models.

ECC

Agent Frameworks

Portable skills, memory, and security for agent harnesses.

Ponytail

Agent Skills

Skills that make agents code like senior devs.

Caveman

Dev Utilities

Cut agent token bills with terse communication.

AllRatesToday

FX & Currency

Real-time FX rates with a live MCP server for agents.

IPASIS

Threat Intel

Bot detection and fraud screening for agent inputs.

Live Tennis API

Sports

Live tennis scores, matches, and players, free.

JSONing

Dev Utilities

Instant throwaway mock APIs from any JSON.

AgentR Webcmd

Agent Frameworks

Browsers agents learn once and remember.

Docker Sandboxes

Dev Utilities

Isolated microVMs for agents that run code.

Hetzner Inference API

AI & ML

Generous free inference: Qwen 35B, 262k context.

Vercel AI Gateway

AI & ML

One gateway for many models, with free credit.

OpenCode 2.0

Agent Frameworks

A free terminal coding agent that runs on your own model keys.

OpenClaw

Agent Frameworks

A round-the-clock personal assistant that lives in your chat apps.

DeepSeek Harness

Agent Frameworks

An agent runtime where every part is a plug-in you can swap.

Agent-Native

Agent Frameworks

Build apps where the agent and the buttons do the same things.

Harness²

Agent Frameworks

A research harness that rewrites its own scaffolding to get smarter.

Android Skills

Agent Skills

Google's official skill files for Android work your agent can follow.

Cognee

Memory

Self-hosted memory for agents, combining search, graphs, and tables.

OpenSandbox

Dev Utilities

Run agent code, shells, and browsers in isolated sandboxes you host.

Azure MCP Server

MCP Servers

Microsoft's MCP server that connects agents to Azure.

Outcrawl

Scraping & Extraction

Web scraping, search, browsers, and task agents built for AI agents.

Scout

Browser Automation

An open browser agent: describe the task, get structured data back.

REA

Dev Utilities

Let your agent inspect apps it has no source code for.