IPinfo API
IP address geolocation and network intelligence API providing city, country, ASN, carrier, privacy detection, and abuse contact data for any IP address.
Open-Meteo API
Free, open-source weather API with no API key required, providing hourly and daily forecasts, historical data, and marine/air quality data from multiple numerical weather prediction models.
Hacker News API
Free, unauthenticated REST API backed by Firebase providing access to Hacker News stories, comments, jobs, polls, and user profiles in real time.
MaxMind GeoIP2 API
Industry-standard IP geolocation and fraud detection service, available as both downloadable database files (GeoLite2/GeoIP2) and a web API with minFraud risk scoring.
The Guardian API
Free REST API providing access to The Guardian's archive of 2+ million articles, sections, tags, and editorial content with full-text body available on approved plans.
ip-api.com
Free IP geolocation REST API requiring no API key for moderate usage, returning country, region, city, ISP, and coordinates for any IP address.
Reddit API
Reddit's REST API for reading posts, comments, and subreddit data, and for automating Reddit interactions like posting, voting, and moderation.
Twitter/X API v2
Twitter/X API v2 for reading and posting tweets, searching public content, accessing user data, and streaming real-time tweet events.