Pre-trained computer vision models.
Roboflow Universe API is a free Machine Learning 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.
Yes. The Roboflow Universe API is listed in the Machine Learning 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 Roboflow Universe API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Roboflow Universe API supports CORS, so front-end JavaScript can call it directly.
Yes. The Roboflow Universe API is served over HTTPS, so it's safe to use in production.