
The Azure DevOps basic components of a REST API request/response pair.
Azure DevOps API is a free Development API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Learn the basic patterns for using the REST APIs for Azure DevOps Services and Azure DevOps Server.
Details from docs.microsoft.com.

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The Azure DevOps API is provided by Microsoft Learn (docs.microsoft.com). Learn the basic patterns for using the REST APIs for Azure DevOps Services and Azure DevOps Server.
Yes. The Azure DevOps API is listed in the Development 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 Azure DevOps API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Azure DevOps API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Azure DevOps API is served over HTTPS, so it's safe to use in production.