Building quick backends.
Base API is a free Development API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
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Yes. The Base API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Base API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Base API supports CORS, so front-end JavaScript can call it directly.
Yes. The Base API is served over HTTPS, so it's safe to use in production.