API Question

so ive been seeing this menu going around on BO3 think its called T7 or something its very private (WOULD LOVE TO GET MY HANDS ON IT )

but my question is im sure ranks and other things like cryptokeys etc are server sided so im thinking they somehow got through with an API to the server stats am i right and would it be that difficult?

Stats are stored client-side but treyarch games use a custom anti-cheat called TreyarchAntiCheat that usually bans for modified stats. Even in bo2 that came out forever ago just changing your xp/prestige by a little would get you banned/prevent you from joining games but some experienced people can get around it unless the game is new since manual bans will be high when you get flagged. Divinium/Crytokeys are probably server-sided but with the API you can probably find a way to change it but not something people will likely share publicly since they make $$ off it and you would need to figure it out on your own