
Maps, Directions, Places and Traffic APIs.
TomTom API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
TomTom Documentation Portal.
Details from developer.tomtom.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
The TomTom API is provided by TomTom Documentation (developer.tomtom.com). TomTom Documentation Portal.
Yes. The TomTom API is listed in the Geocoding 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 TomTom API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The TomTom API supports CORS, so front-end JavaScript can call it directly.
Yes. The TomTom API is served over HTTPS, so it's safe to use in production.