Last verified 2026-10-15
Free APIs for AI agents
Free, no-key APIs you can hand to Claude, ChatGPT, Cursor or any agent that can make HTTP requests. Each page has verified limits with sources, a tested curl request, an agent tool snippet, and when not to use it.
Openverse API
WordPress / Openverse
Search 5.2M+ openly licensed audio tracks and millions of images, with license data on every result. No key required.
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Open-Meteo API
Open-Meteo
Forecasts and current conditions for any latitude/longitude. No key for non-commercial use.
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Wikipedia REST API
Wikimedia Foundation
Article summaries and content from Wikipedia as JSON. No key; set a User-Agent.
View guide