Need public data API with attribution requirements

If you want a public data API that has clear attribution requirements, here are some good options:

1. OpenStreetMap API / Overpass API

• Data: Maps, places, roads, POIs
• License: Open Database License (ODbL)
• Attribution required: Yes
• Best for: Location, geospatial, mapping apps

2. Wikidata API

• Data: Structured knowledge base
• License: CC0 for data, but attribution is still appreciated in practice
• Attribution required: Not strictly required by CC0, but source credit is recommended
• Best for: Entity enrichment, facts, knowledge graphs

3. Wikipedia API

• Data: Encyclopedic content
• License: CC BY-SA
• Attribution required: Yes
• Best for: Summaries, references, content enrichment

4. NASA Open APIs

• Data: Space images, astronomy, science datasets
• License: Usually public domain, but some endpoints request credit
• Attribution required: Often requested depending on dataset
• Best for: Science and imagery apps

5. OpenWeather API

• Data: Weather forecasts, current conditions
• License: Free tier requires attribution
• Attribution required: Yes, depending on plan
• Best for: Weather apps

6. Flickr API

• Data: Photos and metadata
• License: Depends on photo license; many require attribution
• Attribution required: Often yes
• Best for: Image search and media apps

7. Pexels / Unsplash APIs

• Data: Free stock photos/videos
• License: Attribution rules vary:
  • Unsplash: attribution recommended, some use cases require it
  • Pexels: attribution not required, but appreciated
• Best for: Media and design apps

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If you specifically need:

• Strict attribution required: OpenStreetMap, Wikipedia, many Flickr sources
• Low-friction with optional attribution: Pexels, Wikidata
• Commercial-friendly: NASA datasets, Pexels, Unsplash

If you want, I can also give you:

1. a shortlist by category (maps, weather, images, finance, science), or
2. APIs whose terms explicitly require attribution.