Here are 10 APIs you can call right now — no signup, no API key, no payment.
1. Reddit JSON API
Append .json to any URL → structured posts, comments, scores.
Tool
2. YouTube Innertube API
Comments, search, captions — YouTube's internal API. No quotas.
Tool
3. Google News RSS
Real-time news for any query via RSS feed.
Tool
4. Hacker News Firebase + Algolia
Stories, comments, search — two complementary APIs.
Tool
5. Bluesky AT Protocol
Full social media API — profiles, posts, followers.
Tool
6. Wikipedia REST API
Clean JSON summaries, search, media for any topic.
7. Stack Overflow API
Questions, answers, tags, votes — 300 req/day free.
Tool
8. arXiv API
2.5M research papers, searchable by keyword.
9. npm Registry API
Package search, download stats, dependency trees.
Tool
10. DuckDuckGo Instant Answer
Quick factual answers — api.duckduckgo.com/?q=query&format=json
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