According to @StockMKTNewz, Forbes reports that prediction market platform Kalshi is processing about $1 billion in monthly trading volume as of September 15, 2025 (source: Forbes; source: @StockMKTNewz). The post did not provide additional details on market categories, user metrics, or fee structure beyond the headline volume figure (source: @StockMKTNewz). No crypto-specific markets or impacts were specified in the cited summary (source: @StockMKTNewz).