I have been searching for a while now on how to access user data from XBOX live.
Unfortunately, all I found was this which only allows 2 API calls per minute.
Is there an offcial XBOX API that I can access for user information ?
As for the official API, at GDC we just announced the Xbox Live Creators Program, which will soon be open to all developers via the Xbox Live Creators Program – no concept approval required! You will be able to rapidly publish your game to Xbox One or Windows 10 through a short and simplified certification process.
To get started, go here: https://developer.microsoft.com/en-us/games/xbox/xboxlive/creator and follow the 4 steps and it'll guide you through the process.
There's more information here about all our GDC announcements at https://majornelson.com/2017/03/01/new-investments-for-xbox-developers-and-gamers-kick-off-gdc-2017/