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2,166 APIs · page 7 of 46

chucknorris.io

JSON API for hand curated Chuck Norris jokes

No authHTTPSCORS ?

Entertainment

C

Church Calendar

Catholic liturgical calendar

No authNo HTTPSCORS ?

Calendar

Ciprand

Secure random string generator

No authHTTPSNo CORS

Development

CircleCI

Automate the software development process using continuous integration and continuous delivery

apiKeyHTTPSCORS ?

Continuous Integration

CISA Known Exploited Vulnerabilities

CISA KEV catalog of actively exploited CVEs as JSON, filterable by vendor, with CWE and due dates

apiKeyHTTPSCORS ?

Security

Cisco Spark

Team Collaboration Software

OAuthHTTPSCORS ?

Social

Citi

All Citigroup account and statement data APIs

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Finance

Cito UFC API

UFC and MMA fight data: fighters, cards, round stats, rankings and live state

apiKeyHTTPSNo CORS

Sports & Fitness

C

City Bikes

City Bikes around the world

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Sports & Fitness

City, Berlin

Berlin(DE) City Open Data

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Government

City, Gdańsk

Gdańsk (PL) City Open Data

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Government

City, Gdynia

Gdynia (PL) City Open Data

No authNo HTTPSCORS ?

Government

City, Helsinki

Helsinki(FI) City Open Data

No authHTTPSCORS ?

Government

C

City, Lviv

Lviv(UA) City Open Data

No authHTTPSCORS ?

Government

City, Nantes Open Data

Nantes(FR) City Open Data

apiKeyHTTPSCORS ?

Government

City, New York Open Data

New York (US) City Open Data

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Government

City, Prague Open Data

Prague(CZ) City Open Data

No authNo HTTPSCORS ?

Government

City, Toronto Open Data

Toronto (CA) City Open Data

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Government

CityAlert

Live public-safety incidents: crime, fire, disaster, weather and news from 650+ official feeds

No authHTTPSNo CORS

Open Data

CitySDK

Open APIs for select European cities

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Geocoding

Clair

Live public web data as JSON: Google Search, Maps, News, Amazon, jobs, reviews & more, one API key

apiKeyHTTPSNo CORS

Development

C

Clarifai

Computer Vision

OAuthHTTPSCORS ?

Machine Learning

Clash of Clans

Clash of Clans Game Information

apiKeyHTTPSCORS ?

Games & Comics

Clash Royale

Clash Royale Game Information

apiKeyHTTPSCORS ?

Games & Comics

C

Classify

Encrypting & decrypting text messages

No authHTTPSCORS

Security

claudecookie

Convert cookie formats, check Claude sessions and generate Claude Code credentials

No authHTTPSCORS

Development

C

CleanURI

URL shortener service

No authHTTPSCORS

URL Shorteners

Clearbit Logo

Search for company logos and embed them in your projects

apiKeyHTTPSCORS ?

Business

ClearTrace

Cross-frontend DEX attribution and execution quality data across Ethereum and L2s

No authHTTPSCORS

Blockchain

C

ClickMeter

Monitor, compare and optimize your marketing links

apiKeyHTTPSCORS ?

URL Shorteners

ClickUp

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

OAuthHTTPSCORS ?

Documents & Productivity

Clico

URL shortener service

apiKeyHTTPSCORS ?

URL Shorteners

Climatiq

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

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Environment

Cloudbet

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

apiKeyHTTPSCORS

Sports & Fitness

CloudConvert

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

apiKeyHTTPSCORS ?

Documents & Productivity

Cloudflare

Manage DNS, CDN, Workers and other services; documented with an official OpenAPI 3.0 spec

apiKeyHTTPSNo CORS

Development

Cloudflare Trace

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

No authHTTPSCORS

Development

Cloudmersive

Image captioning, face recognition, NSFW classification

apiKeyHTTPSCORS

Machine Learning

Cloudmersive Document and Data Conversion

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

apiKeyHTTPSCORS

Documents & Productivity

Cloudmersive Natural Language Processing

Natural language processing and text analysis

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Text Analysis

Cloudmersive Validate

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

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Email

Cloudmersive Validate

Validate international phone numbers

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Phone

Cloverly

API calculates the impact of common carbon-intensive activities in real time

apiKeyHTTPSCORS ?

Environment

CMS.gov

Access to the data from the CMS - medicare.gov

apiKeyHTTPSCORS ?

Health

CO2 Offset

API calculates and validates the carbon footprint

No authHTTPSCORS ?

Environment

Code Detection

Detect, label, format and enrich the code in your app or in your data pipeline

OAuthHTTPSCORS ?

Text Analysis

Code.gov

The primary platform for Open Source and code sharing for the U.S. Federal Government

apiKeyHTTPSCORS ?

Government

Code::Stats

Automatic time tracking for programmers

apiKeyHTTPSNo CORS

Documents & Productivity

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