Frankfurter
Free currency exchange rates API.
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About NASA Open APIs
NASA exposes imagery and data — Astronomy Picture of the Day, Mars rover photos, near-Earth objects — through free APIs with generous limits.
Key features
- APOD and Mars rover imagery
- Asteroid and Earth data
- Simple API key signup
Pros
- Iconic data for demo projects
- Generous free limits
Cons
- Schemas vary between APIs
- Some datasets update slowly
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