The combined trading volume of prediction market platforms Polymarket and Kalshi exceeded $150 billion in April, according to a BlockBeats report. This marks the end of a seven-month streak of monthly growth. Polymarket experienced a decline in active trading users, dropping from 733,000 in March to around 643,000, which contributed to the overall decrease in market volume. Despite this, Polymarket's U.S. business continues to expand, while Kalshi's performance remains on an upward trajectory.