https://api.steampowered.com/ISteamDirectory/GetCMList/v1/
NameValueTypeRequiredDescription
uint32 Yes Client's Steam cell ID
uint32 NoMax number of servers to return
https://api.steampowered.com/ISteamDirectory/GetCMListForConnect/v1/
NameValueTypeRequiredDescription
uint32 NoClient's Steam cell ID, uses IP location if blank
string NoOptional CM type filter
string NoOptional Steam Realm filter
uint32 NoMax number of servers to return
uint32 NoDesired connection priority
https://api.steampowered.com/ISteamDirectory/GetSteamPipeDomains/v1/