Free Public APIs for Developers and Agents
Free public web APIs that developers and AI agents can call. Entries come from the open public-apis list; each link was checked automatically (HTTP status) on the date shown, which says the site responded, not that the API is good.
CoinLobster
Live executed whale trades across 15 exchanges and on-chain DEX with an unusualness radar
Coinlore
Cryptocurrencies prices, volume and more
CoinMarketCap
Cryptocurrencies Prices
Coinmico
Crypto prices, volume and liquidity measured from real trades on 50+ exchanges and DEXs
CoinNudge
Current crypto market breadth, funding and open-interest research datasets
Coinpaprika
Cryptocurrencies prices, volume and more
CoinRanking
Live Cryptocurrency data
Coinremitter
Cryptocurrencies Payment & Prices
CoinStats
Crypto Tracker
CollegeCalcAI
US college admission chance estimates and admissions data for 1,100+ colleges
CollegeFootballData.com
Unofficial detailed American college football statistics, records, and results API
CollegeScoreCard.ed.gov
Data on higher education institutions in the United States
Collins
Bilingual Dictionary and Thesaurus Data
Colorado Information Marketplace
Colorado State Government Open Data
ColorfulClouds
Weather
Comic Vine
Comics
Community Transit
Transitland API
Compabase
Polish company data: 3M+ KRS and CEIDG entities with financial statements, people and rankings
Compare Flight Prices
API for comparing flight prices across platforms
Complete Criminal Checks
Provides data of offenders from all U.S. States and Pureto Rico
CompliAPI
Screen crypto addresses, emails, websites, IDs and countries against OFAC, EU, UK sanctions lists
CompressGIF
Compress GIF files or HTTPS URLs with asynchronous jobs and target-size controls
Compresso
Visually lossless image compression for PNG, JPEG and WebP
CongressInvests
Real-time U.S. congressional stock trade disclosures from Senate EFD and House Clerk
ConnectMeGuru
Search and purchase prepaid travel eSIM data plans across 190+ countries
ContaCLT
Brazilian payroll and labor calculations: net salary, INSS, IRRF, unemployment insurance
Contentful Images
Used to retrieve and apply transformations to images
contix
Spain: IBAN validation with bank and BIC, EU VAT number check (VIES), Modelo 303 VAT sums
Conversor IAE CNAE
Spanish IAE/CNAE tax activity codes, 2009→2025 crosswalk and AEAT obligations
Convert Online
Online file converter for image, video, audio, document, ebook, font, archive and CAD formats
CookbookSocial Nutrition
Nutrition data for 4,631 ingredients with food names in 19 languages
Cooper Hewitt
Smithsonian Design Museum
CORE
Access the world's Open Access research papers
Coronavirus
HTTP API for Latest Covid-19 Data
Coronavirus in the UK
UK Government coronavirus data, including deaths and cases by region
Corporate Buzz Words
REST API for Corporate Buzz Words
CorpStacking
Corporate, government and ETF Bitcoin, Ethereum and Solana treasury disclosures
corpusAI Cloud Pricing
Cloud, GPU and LLM token prices for agents, free discovery tools and paid per-call data
Correios
Integration to provide information and prepare shipments using Correio's services
CORS Proxy
Get around the dreaded CORS error by using this proxy as a middle man
CosmyDay Astrology
Natal charts and sky events computed from Swiss Ephemeris
Council of AI
Read a signed AI measurement board and verify its signed records and Merkle proofs
Countly
Countly web analytics
CountryStateCity
World countries, states, regions, provinces, cities & towns in JSON, SQL, XML, YAML, & CSV format
Covalent
Multi-blockchain data aggregator platform
Covid Tracking Project
Covid-19 data for the US
Covid-19
Covid 19 cases, deaths and recovery per country
Covid-19 Datenhub
Maps, datasets, applications and more in the context of COVID-19
Covid-19 Government Response
Government measures tracker to fight against the Covid-19 pandemic
Covid-19 India
Covid 19 statistics state and district wise about cases, vaccinations, recovery within India
Covid-19 JHU CSSE
Open-source API for exploring Covid19 cases based on JHU CSSE
Covid-19 Live Data
Global and countrywise data of Covid 19 daily Summary, confirmed cases, recovered and deaths
Covid-19 Philippines
Unofficial Covid-19 Web API for Philippines from data collected by DOH
COVID-19 Tracker Canada
Details on Covid-19 cases across Canada
CoworkingView
Coworking spaces and offices in 63 European and Gulf cities with operator-published prices
CPFHub
Brazilian CPF lookup — returns full name, birth date, and gender for any CPF
Crafatar
API for Minecraft skins and faces
CraftMyPDF
Generate PDF documents from templates with a drop-and-drop editor and a simple API
Crawl Readiness
Check if AI crawlers (ChatGPT, Claude, Perplexity, 30+ others) can access any website
Creative Commons Catalog
Search among openly licensed and public domain works
Cross Universe
Cross Universe Card Data
Crossref Metadata Search
Books & Articles Metadata
Cruise Itinerary
Cruise sailings, day-by-day itineraries, weekly fare history, port traffic and a cruise price index
CruiseFeed
Normalized cruise line inventory: ships, sailings, itineraries, ports and lead-in fares
Crustdata
People and company data covering profiles, headcount, funding and contacts
CryptAPI
Cryptocurrency Payment Processor
CryptingUp
Cryptocurrency data
Crypto Vision
Free crypto news aggregator with market context, JSON REST and RSS
CryptoCompare
Cryptocurrencies Comparison
CSR.plus
Generate certificate signing requests and private keys without OpenSSL
CTS
CTS Realtime API
CuratorSearch
Museum and gallery jobs from 400+ institutions' own careers pages, with advertised salaries
Cure Cancer With AI
Oncology research, clinical trials, FDA approvals, news, and MAMMAL predictions
CurlShot
Screenshots, PDFs and scrolling videos of any URL, HTML or Markdown; free tier
Currency-api
Free Currency Exchange Rates API with 150+ Currencies & No Rate Limits
CurrencyBeacon
Real-time and historical currency exchange rates with free tier
CurrencyFreaks
Provides current and historical currency exchange rates with free plan 1K requests/month
Currencylayer
Exchange rates and currency conversion
CurrencyScoop
Real-time and historical currency rates JSON API
Currents
Real-time and historical global news with multilingual support
Cutt.ly
URL shortener service
CuttingToolsAI
Cross-brand carbide insert grade equivalents by ISO application class
CycleCalcs
Interpreted astronomy: sun and moon times, moon phases, planets, eclipses, seasons
Czech National Bank
A collection of exchange rates
Dabloons
Bounty board where AI agents post and work tasks like PR reviews, bug repros and install checks
Daily Food Recalls
U.S. FDA and USDA food recalls, merged and normalized, updated daily
daily.dev
Developer news feeds, posts, bookmarks, tags and search from daily.dev
DailyMed
FDA drug labeling and package insert information
Dailymotion
Dailymotion Developer API
Daleelak
Egyptian bank and dealer exchange rates, gold and silver prices
Danbooru Anime
Thousands of anime artist database to find good anime art
Danish data service Energi
Open energy data from Energinet to society
Data USA
US Public Data
Data.gov
US Government Data
Data.parliament.uk
Contains live datasets including information about petitions, bills, MP votes, attendance and more
Databricks
Service to manage your databricks account,clusters, notebooks, jobs and workspaces
DataCite
Search and retrieve DOI metadata for research datasets and publications
DataCube AI
Daily curated AI industry news, funding rounds and trends in 8 languages
Dataflow Kit COVID-19
COVID-19 live statistics into sites per hour
Datamuse
Word-finding query engine