Public APIs

Chainpoint is a global network for anchoring data to the Bitcoin blockchain

Blockchain HTTPS

Changelogs.md

Structured changelog metadata from open source projects

Development HTTPS

Charity Search

Non-profit charity data

Business

CheapShark

Games & Comics HTTPS CORS

Steam/PC Game Prices and Deals

Checkiday - National Holiday API

Industry-leading Holiday API. Over 5,000 holidays and thousands of descriptions. Trusted by the World’s leading companies

Calendar HTTPS

CheetahO

Photo optimization and resize

Photography HTTPS

Chess.com

Chess.com read-only REST API

Games & Comics HTTPS

Chinese Character Web

Chinese character definitions and pronunciations

Dictionaries

Chinese Text Project

Online open-access digital library for pre-modern Chinese texts

Dictionaries HTTPS

Chomp

Data about various grocery products and foods

Food & Drink HTTPS

Chronicling America

Provides access to millions of pages of historic US newspapers from the Library of Congress

News

Chuck Norris Database

Jokes

Games & Comics

chucknorris.io

JSON API for hand curated Chuck Norris jokes

Entertainment HTTPS

Church Calendar

Catholic liturgical calendar

Calendar

Ciprand

Secure random string generator

Development HTTPS

CircleCI

Continuous Integration HTTPS

Automate the software development process using continuous integration and continuous delivery

Cisco Spark

OAuth

Team Collaboration Software

Social HTTPS

OAuth Docs

Citi

All Citigroup account and statement data APIs

Finance HTTPS

City Bikes

City Bikes around the world

Sports & Fitness HTTPS

City, Berlin

Berlin(DE) City Open Data

City, Gdańsk

Gdańsk (PL) City Open Data

City, Gdynia

Gdynia (PL) City Open Data

Government

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, Prague Open Data

Prague(CZ) City Open Data

Government

City, Toronto Open Data

Toronto (CA) City Open Data

Government HTTPS CORS

CitySDK

Open APIs for select European cities

Geocoding HTTPS

Clarifai

OAuth

Computer Vision

Machine Learning HTTPS

OAuth Docs

Clash of Clans

Clash of Clans Game Information

Games & Comics HTTPS

Clash Royale

Clash Royale Game Information

Games & Comics HTTPS

Classify

Encrypting & decrypting text messages

Security HTTPS CORS

CleanURI

URL Shorteners HTTPS CORS

URL shortener service

Clearbit Logo

Search for company logos and embed them in your projects

Business HTTPS

ClickMeter

Monitor, compare and optimize your marketing links

URL Shorteners HTTPS

Documents & Productivity HTTPS

ClickUp

OAuth

ClickUp is a robust, cloud-based project management tool for boosting productivity

OAuth Docs

Clico

URL shortener service

URL Shorteners HTTPS

Climatiq

Calculate the environmental footprint created by a broad range of emission-generating activities

Environment HTTPS CORS

Clockify

Documents & Productivity HTTPS

Clockify's REST-based API can be used to push/pull data to/from it & integrate it with other systems

Cloudbet

Sports & Fitness HTTPS CORS

Official Cloudbet API provides real-time sports odds and betting API to place bets programmatically

CloudConvert

Documents & Productivity HTTPS

Online file converter for audio, video, document, ebook, archive, image, spreadsheet, presentation

Cloudflare Trace

Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More

Development HTTPS CORS

Cloudmersive

Machine Learning HTTPS CORS

Image captioning, face recognition, NSFW classification

Cloudmersive Document and Data Conversion

Documents & Productivity HTTPS CORS

HTML/URL to PDF/PNG, Office documents to PDF, image conversion

Cloudmersive Natural Language Processing

Natural language processing and text analysis

Text Analysis HTTPS CORS

Cloudmersive Validate

Validate international phone numbers

Phone HTTPS CORS

Cloudmersive Validate

Validate email addresses, phone numbers, VAT numbers and domain names

Email HTTPS CORS