This page is just a reference of all the known Steam APIs, I do not know how they work. Please do not email me with questions.
UNDOCUMENTEDGetFanContentStatus
https://api.steampowered.com/IDOTA2Teams_570/GetFanContentStatus/v1/
UNDOCUMENTEDGetPlayerInfo
https://api.steampowered.com/IDOTA2Teams_570/GetPlayerInfo/v1/
UNDOCUMENTEDGetSingleTeamInfo
https://api.steampowered.com/IDOTA2Teams_570/GetSingleTeamInfo/v1/
UNDOCUMENTEDGetTeamInfos
https://api.steampowered.com/IDOTA2Teams_570/GetTeamInfos/v1/