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WeCanTrack API is a free Tracking API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
A magical documentation generator.
Details from docs.wecantrack.com.

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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.
An API to query Brazilian ZIP codes and orders easily, quickly and free
The WeCanTrack API is provided by We Can Track Documentation (docs.wecantrack.com). A magical documentation generator.
Yes. The WeCanTrack API is listed in the Tracking 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 WeCanTrack API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The WeCanTrack API supports CORS, so front-end JavaScript can call it directly.
Yes. The WeCanTrack API is served over HTTPS, so it's safe to use in production.