[Kalshi Prediction Market Monthly Trading Volume Reaches $1 Billion] Kalshi's prediction market monthly trading volume has surpassed $1 billion, accounting for 62% of the global market share, ahead of Polymarket's 37%. Meanwhile, four states, including Massachusetts, have filed lawsuits accusing it of being an unlicensed sports betting platform, with Massachusetts seeking a permanent injunction. Kalshi responded, stating that it is federally regulated by the CFTC, which takes precedence over state gambling law requirements.