The only information I can give you is that we pull information directly from Xbox LIVE.
To get official Xbox API access, you used to be able to apply through the XCDP (Xbox Community Developer Program), but I think that has been closed now. There is the ID@Xbox program at the moment, but I don't think that is for getting API access but rather for game developers to access tools to create Xbox games.
I'm a new member,I've used several sites over the years for Gaming news/Reviews/Guides/Forums etc.So can you kind of summarise what services & features MYGAMERPROFILE offers? What would you say is the sites best 'selling point' as it were?