security
CISA Known Exploited Vulnerabilities
CISA KEV catalog of actively exploited CVEs as JSON, filterable by vendor, with CWE and due dates
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
PUBLICAPI / API directory
Find your next API.
Know the limits. Build further.
A practical starting point for public APIs. Compare access, pricing and limitations — with direct links to the original sources.
Categories (61)
2277 APIs found
security
CISA Known Exploited Vulnerabilities
A machine-readable catalog of exploited vulnerabilities listed by CISA.
HTTPS: unknown · CORS: unknown
profiles
Source research
social
Cisco Spark
Team Collaboration Software
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
finance
Citi
All Citigroup account and statement data APIs
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
sports-and-fitness
Cito UFC API
UFC and MMA fight data: fighters, cards, round stats, rankings and live state
HTTPS: yes · CORS: no
github-public-apis
Source listing · not independently checked
sports-and-fitness
City Bikes
City Bikes around the world
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Berlin
Berlin(DE) City Open Data
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Gdańsk
Gdańsk (PL) City Open Data
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Gdynia
Gdynia (PL) City Open Data
HTTPS: no · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Helsinki
Helsinki(FI) City Open Data
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Lviv
Lviv(UA) City Open Data
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Nantes Open Data
Nantes(FR) City Open Data
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, New York Open Data
New York (US) City Open Data
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Prague Open Data
Prague(CZ) City Open Data
HTTPS: no · CORS: unknown
github-public-apis
Source listing · not independently checked
government
City, Toronto Open Data
Toronto (CA) City Open Data
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
open-data
CityAlert
Live public-safety incidents: crime, fire, disaster, weather and news from 650+ official feeds
HTTPS: yes · CORS: no
github-public-apis
Source listing · not independently checked
geocoding
CitySDK
Open APIs for select European cities
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
development
Clair
Live public web data as JSON: Google Search, Maps, News, Amazon, jobs, reviews & more, one API key
HTTPS: yes · CORS: no
github-public-apis
Source listing · not independently checked
machine-learning
Clarifai
Computer Vision
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
games-and-comics
Clash of Clans
Clash of Clans Game Information
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
games-and-comics
Clash Royale
Clash Royale Game Information
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
security
Classify
Encrypting & decrypting text messages
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
development
claudecookie
Convert cookie formats, check Claude sessions and generate Claude Code credentials
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
url-shorteners
CleanURI
URL shortener service
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
business
Clearbit Logo
Search for company logos and embed them in your projects
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
blockchain
ClearTrace
Cross-frontend DEX attribution and execution quality data across Ethereum and L2s
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
url-shorteners
ClickMeter
Monitor, compare and optimize your marketing links
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
documents-and-productivity
ClickUp
ClickUp is a robust, cloud-based project management tool for boosting productivity
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
url-shorteners
Clico
URL shortener service
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
environment
Climatiq
Calculate the environmental footprint created by a broad range of emission-generating activities
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
documents-and-productivity
Clockify
Clockify's REST-based API can be used to push/pull data to/from it & integrate it with other systems
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
sports-and-fitness
Cloudbet
Official Cloudbet API provides real-time sports odds and betting API to place bets programmatically
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
documents-and-productivity
CloudConvert
Online file converter for audio, video, document, ebook, archive, image, spreadsheet, presentation
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
development
Cloudflare
Manage DNS, CDN, Workers and other services; documented with an official OpenAPI 3.0 spec
HTTPS: yes · CORS: no
github-public-apis
Source listing · not independently checked
development
Cloudflare Trace
Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
machine-learning
Cloudmersive
Image captioning, face recognition, NSFW classification
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
documents-and-productivity
Cloudmersive Document and Data Conversion
HTML/URL to PDF/PNG, Office documents to PDF, image conversion
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
text-analysis
Cloudmersive Natural Language Processing
Natural language processing and text analysis
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
Cloudmersive Validate
Validate email addresses, phone numbers, VAT numbers and domain names
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
phone
Cloudmersive Validate
Validate international phone numbers
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
environment
Cloverly
API calculates the impact of common carbon-intensive activities in real time
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
health
CMS.gov
Access to the data from the CMS - medicare.gov
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
environment
CO2 Offset
API calculates and validates the carbon footprint
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
text-analysis
Code Detection
Detect, label, format and enrich the code in your app or in your data pipeline
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
documents-and-productivity
Code::Stats
Automatic time tracking for programmers
HTTPS: yes · CORS: no
github-public-apis
Source listing · not independently checked
government
Code.gov
The primary platform for Open Source and code sharing for the U.S. Federal Government
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
development
Codeberg
Git hosting, repos and issues via Gitea API
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
science-and-math
CodeCogs
Render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
programming
Codeforces
Get access to Codeforces data
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
continuous-integration
Codeship
Codeship is a Continuous Integration Platform in the cloud
HTTPS: yes · CORS: unknown
github-public-apis
Source listing · not independently checked
cryptocurrency
0x
API for querying token and pool stats across various liquidity pools
HTTPS: yes · CORS: yes
github-public-apis
Source listing · not independently checked
No results. Clear a filter or try another search term.
From discovery to implementation
Build with understanding.
Practical API integration guides, separate from catalog listings.
All guides →- GeoJSON to a map: valid numbers do not prove coordinate order →
- Read a damaged JSON sequence without pretending it is complete →
- JSON intake: reject ambiguous bytes before checking the resource schema →
- Read Problem Details without turning an error message into a decision rule →
- A relative API link is not text to append to a domain →
A guide for your situation
Your answers stay in this page until you explicitly submit them. Unsaved answers disappear on reload.
Saving is not configured. No answers or contact details are submitted or saved.
Which integration step helps you move forward?
30 short questions about APIs and connecting data. Selecting an answer moves to the next question. You can go back, change answers, or skip. This is a practical reading route, not a scientific test.
JavaScript is required for this guide.
Contact & corrections
Send a question or report a correction using this form.
Only after Send are your name, email, subject and message sent to the contact service to handle your message. This is not a newsletter signup. Unsent text disappears on reload. Privacy information
Preview: sending is not configured. This form does not send or save anything.