BigDataCloud
Provides fast and accurate IP geolocation APIs along with security checks and confidence area
Create/customize digital maps based on Bing Maps data.
Bing Maps API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Azure Maps provides location intelligence, traffic, mobility, and geospatial mapping APIs for IoT and enterprise systems to enhance mobile and web-based apps.
Details from microsoft.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.
Provides fast and accurate IP geolocation APIs along with security checks and confidence area
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The Bing Maps API is provided by Microsoft Azure (microsoft.com). Azure Maps provides location intelligence, traffic, mobility, and geospatial mapping APIs for IoT and enterprise systems to enhance mobile and web-based apps.
Yes. The Bing Maps 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 Bing Maps API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Bing Maps API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Bing Maps API is served over HTTPS, so it's safe to use in production.