GZW Data
Gray Zone Warfare weapons, missions, loot, armor and game data
Halo 5 and Halo Wars 2 Information.
Halo API is a free Games & Comics API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Discover APIs, learn how to use them, try them out interactively, and sign up to acquire keys.
Details from developer.haloapi.com.

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Gray Zone Warfare weapons, missions, loot, armor and game data
The Halo API is provided by Microsoft Azure API Management - developer portal (developer.haloapi.com). Discover APIs, learn how to use them, try them out interactively, and sign up to acquire keys.
Yes. The Halo API is listed in the Games & Comics 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 Halo API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Halo API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Halo API is served over HTTPS, so it's safe to use in production.