最新报道:Kalshi leads the prediction market sector with 62% of trading volume from Sept. 11-17, totaling over $500 million weekly and $189 million in open interest, while Polymarket held 37% with $430 million volume and $164 million open interest. Kalshi's lower open interest-to-volume ratio of 0.29 versus Polymarket's 0.38 indicates faster turnover. Polymarket is expanding in the U.S. through its acquisition of regulated exchange QCX and partnering with Stocktwits for earnings-based markets.