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.
BriefTape
Real-time AI-summarized SEC filings, Fed, FDA and BLS data, ticker-tagged
Browshot
Easily make screenshots of web pages in any screen size, as any device
BTCGlobe
Bitcoin height, fees, mempool and peer data served live from two self-hosted nodes
btcnode.uk
Bitcoin blockchain data, fees, mempool, SEC insider trades, Reddit sentiment. x402 micropayments for paid endpoints.
BtcTurk
Real-time cryptocurrency data, graphs and API that allows buy&sell
BTU Graph
Source-reviewed energy company knowledge graph and directory exports
Bucketlist Dream of the Day
Daily travel and life-experience inspiration with canonical links and images
Buddy
The fastest continuous integration and continuous delivery platform
Bugcrowd
Bugcrowd API for interacting and tracking the reported issues programmatically
BuildPDF
Convert HTML, images, and text to PDF
BulkTranscripts
YouTube transcripts for a video, a whole channel or a playlist, plus YouTube search
Bureau of Labor Statistics
US labor statistics: inflation, unemployment, wages and productivity
BuyWhere
Real-time product catalog API for AI agents across merchants in 7 countries (SG, MY, TH, VN, PH, ID, US)
Bybit
Cryptocurrency data feed and algorithmic trading
caldays
Public holidays for 195+ countries
Calendarific
Worldwide Holidays
Call of Duty Mobile
Unofficial API for CODM player data and daily cache claiming
Callook.info
United States ham radio callsigns
CalorieNinjas
Nutrition and calorie data for foods and recipes
Can I enter
Visa and entry requirements for 199 passports, cited to official sources, verified daily
CAPEsandbox
Malware execution and analysis
Carbon Interface
API to calculate carbon (C02) emissions estimates for common C02 emitting activities
CardBinCheck
Card BIN/IIN lookup: network, issuer, country and card type for the first 6-8 digits
Careerjet
Job search engine
Cartes.io
Create maps and markers for anything
CARTO
Location Information Prediction
CartScout
Price, stock, variants and GTIN from Shopify, WooCommerce, Walmart and eBay product pages
CarVector
Vehicle specs, images, recalls, and DTC codes across 1925-2029
Cat Facts
Daily cat facts
Cat Facts
Random cat facts
Catastro GPS
Cadastral parcels in 29 European countries by reference, point or address
Catboy
Neko images, funny GIFs & more
Cats
Pictures of cats from Tumblr
CDNJS
Library info on CDNJS
Census.gov
The US Census Bureau provides various APIs and data sets on demographics and businesses
Censys
Search engine for Internet connected host and devices
Chainlink
Build hybrid smart contracts with Chainlink
Chainpoint
Chainpoint is a global network for anchoring data to the Bitcoin blockchain
Changelogs.md
Structured changelog metadata from open source projects
ChargeAlong
EV charging sites in AU, NZ, US, UK and Canada, with nearby search and trip planning
ChartBytes
Chart image API: turn a URL into a PNG or SVG chart (bar, line, area, scatter, pie, donut, stacked)
CheapShark
Steam/PC Game Prices and Deals
Checkiday - National Holiday
Industry-leading holiday data with over 5,000 holidays and thousands of descriptions
CheetahO
Photo optimization and resize
Chempirical
Chemical compounds with physical data, reactions and substructure search
Chess.com
Chess.com read-only REST API
Chinese Text Project
Online open-access digital library for pre-modern Chinese texts
Chomp
Data about various grocery products and foods
chucknorris.io
JSON API for hand curated Chuck Norris jokes
Ciprand
Secure random string generator
CircleCI
Automate the software development process using continuous integration and continuous delivery
CISA Known Exploited Vulnerabilities
CISA KEV catalog of actively exploited CVEs as JSON, filterable by vendor, with CWE and due dates
Cisco Spark
Team Collaboration Software
Citi
All Citigroup account and statement data APIs
Cito UFC API
UFC and MMA fight data: fighters, cards, round stats, rankings and live state
City Bikes
City Bikes around the world
City, Berlin
Berlin(DE) City Open Data
City, Gdańsk
Gdańsk (PL) City Open Data
City, Helsinki
Helsinki(FI) City Open Data
City, Lviv
Lviv(UA) City Open Data
City, Nantes Open Data
Nantes(FR) City Open Data
City, New York Open Data
New York (US) City Open Data
City, Toronto Open Data
Toronto (CA) City Open Data
CityAlert
Live public-safety incidents: crime, fire, disaster, weather and news from 650+ official feeds
Clair
Live public web data as JSON: Google Search, Maps, News, Amazon, jobs, reviews & more, one API key
Clash of Clans
Clash of Clans Game Information
Clash Royale
Clash Royale Game Information
claudecookie
Convert cookie formats, check Claude sessions and generate Claude Code credentials
Clearbit Logo
Search for company logos and embed them in your projects
ClearTrace
Cross-frontend DEX attribution and execution quality data across Ethereum and L2s
ClickUp
ClickUp is a robust, cloud-based project management tool for boosting productivity
Clico
URL shortener service
Climatiq
Calculate the environmental footprint created by a broad range of emission-generating activities
Clockify
Clockify's REST-based API can be used to push/pull data to/from it & integrate it with other systems
Cloudbet
Official Cloudbet API provides real-time sports odds and betting API to place bets programmatically
CloudConvert
Online file converter for audio, video, document, ebook, archive, image, spreadsheet, presentation
Cloudflare
Manage DNS, CDN, Workers and other services; documented with an official OpenAPI 3.0 spec
Cloudflare Trace
Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More
Cloudmersive
Image captioning, face recognition, NSFW classification
Cloudmersive Document and Data Conversion
HTML/URL to PDF/PNG, Office documents to PDF, image conversion
Cloudmersive Natural Language Processing
Natural language processing and text analysis
Cloudmersive Validate
Validate email addresses, phone numbers, VAT numbers and domain names
Cloudmersive Validate
Validate international phone numbers
CMS.gov
Access to the data from the CMS - medicare.gov
CO2 Offset
API calculates and validates the carbon footprint
Code::Stats
Automatic time tracking for programmers
Codeberg
Git hosting, repos and issues via Gitea API
CodeCogs
Render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options
Codeforces
Get access to Codeforces data
Codeship
Codeship is a Continuous Integration Platform in the cloud
Coffee
Random pictures of coffee
Cohere
NLP API for text generation, embeddings, classification and summarization with a free trial tier
CoinAPI
All Currency Exchanges integrate under a single api
Coinbase
Bitcoin, Bitcoin Cash, Litecoin and Ethereum Prices
Coinbase Pro
Cryptocurrency Trading Platform
CoinCap
Real time Cryptocurrency prices through a RESTful API
CoinDCX
Cryptocurrency Trading Platform
Coinigy
Interacting with Coinigy Accounts and Exchange Directly
Coinlayer
Real-time Crypto Currency Exchange Rates
Coinlib
Crypto Currency Prices