[Polymarket and Kalshi Cumulative Trading Volume Surpasses $150 Billion] Odaily Planet Daily News: Prediction market platforms Polymarket and Kalshi saw their cumulative trading volume surpass $150 billion in April, though their seven-month streak of consecutive monthly growth has come to an end. Data shows that Polymarket's active trading user count dropped from 733,000 in March to approximately 643,000, leading to an overall market trading volume decline. However, its U.S. operations continue to grow, and Kalshi's performance remains on an upward trajectory.