Most of Dota 2 betting website didn't have fiat currency option for the payout, I mean, they just paid me by Dota 2 item which is not worth it so much as I do not really like using those skin, and I must sell it first to get fiat, which is taking a long time to be sold (usually takes 3-4 days on market, depends on what's the skin is). I knew some Dota 2 market that using auto trade bot to sell instantly my many items but their fees its too damn high. Any suggest?

Try nitrogensports, they usually cover all games (BO1-BO5) including over/under total kills and handicap too. What i like on nitrogensports is i can still make a bet when the draft still on. Sometimes i hate the way they grade the bets, e-sports takes more time to graded. If the match is unpopular it might takes a day.