Build upload API not yet available?

Dear community,

in order to modernize our build pipelines, I wanted to try out the new App Store Connect build upload API that was introduced in the WWDC video "Automate your development process with the App Store Connect API". However, when POSTing to https://api.appstoreconnect.apple.com/v1/buildUploads, I receive the following error message:

{
    "errors": [
        {
            "id": "9fb916ea-4d26-4712-8c55-d1d4b5320bf2",
            "status": "404",
            "code": "PATH_ERROR",
            "title": "The URL path is not valid",
            "detail": "The resource 'v1/buildUploads' does not exist"
        }
    ]
}

Is this API not yet available or am I doing something wrong? If it is not yet available, is there an ETA?

Thanks in advance & best regards,

Yannik