What should I use for a data API with good docs and sandbox?

If you want a data API with good docs and a sandbox, the best choice depends on the kind of data you need. Here are solid options by use case:

Best general-purpose data APIs

• Google Cloud APIs / BigQuery public datasets

  • Very good docs
  • Strong sandbox/free-tier options
  • Great for structured data and analytics

• AWS Public Datasets + API Gateway/Lambda setups

  • Good if you already use AWS
  • Docs can be good, but sandbox experience varies by provider

• RapidAPI marketplace

  • Huge selection of data APIs
  • Usually has interactive docs and test consoles
  • Good for trying many APIs quickly, though quality varies

Best for business/financial data

• Alpha Vantage
  • Easy to start
  • Decent docs
  • Free tier/sandbox-like usage for testing
• Polygon.io
  • Strong docs and developer experience
  • Good for market data
• IEX Cloud
  • Good docs and fairly friendly onboarding

Best for geospatial / maps / places

• Google Maps Platform
  • Excellent docs
  • Strong testing tools
• Mapbox
  • Good docs and sandbox-friendly developer experience

Best for product/dev data sources

• GitHub API
  • Excellent docs
  • Great sandbox via personal access tokens and test endpoints
• Stripe API if you need transactional data-like patterns
  • Best-in-class docs and sandbox
  • Not a data API per se, but a gold standard for developer experience

If you want the best docs + sandbox experience overall

My top picks are:

1. Stripe — best docs and test mode, though not a pure data API
2. Google APIs — strong docs and reliable tooling
3. RapidAPI — best for exploring multiple data APIs quickly
4. Polygon.io / Alpha Vantage — if your data is financial

If you tell me:

• what kind of data you need,
• whether it’s for prototyping or production,
• and your budget,

I can recommend the best 3 APIs for your exact use case.