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.
UNDOCUMENTEDGetArcanaVotes
https://api.steampowered.com/IDOTA2Events_570/GetArcanaVotes/v1/
UNDOCUMENTEDGetCurrentTriviaQuestions
https://api.steampowered.com/IDOTA2Events_570/GetCurrentTriviaQuestions/v1/
UNDOCUMENTEDGetDraftTriviaMatchInfo
https://api.steampowered.com/IDOTA2Events_570/GetDraftTriviaMatchInfo/v1/
UNDOCUMENTEDGetDraftTriviaVoteCount
https://api.steampowered.com/IDOTA2Events_570/GetDraftTriviaVoteCount/v1/
UNDOCUMENTEDGetMutations
https://api.steampowered.com/IDOTA2Events_570/GetMutations/v1/
UNDOCUMENTEDGetTriviaQuestionAnswersSummary
https://api.steampowered.com/IDOTA2Events_570/GetTriviaQuestionAnswersSummary/v1/