[Kalshi Contract Trading Open Interest Surpasses $200 Million, Reaching a Record High] Odaily Planet Daily reports that according to DefiLlama data, the open interest (OI) of prediction market platform Kalshi exceeded $200 million in late September, setting a new all-time high. Back in April of this year, the figure was less than $50 million, marking a growth of over 300% in the past six months. During the same period, trading volume also showed an upward trend, with daily transaction amounts in September consistently ranging between $50 million and $100 million.