[Polymarket and Kalshi Combined Historical Trading Volume Surpasses $150 Billion] According to The Block, the combined historical trading volume of prediction market platforms Polymarket and Kalshi surpassed $150 billion in April, but it ended a seven-month streak of monthly trading volume records since September last year. In April, Polymarket's active traders dropped to approximately 643,000, down from over 733,000 in March. Its global platform's USD trading volume and nominal trading volume both declined, but its U.S. subsidiary platform under development and Kalshi's overall growth remain on the rise. After winning a lawsuit against the CFTC in 2024, Kalshi was authorized to offer election contracts and rapidly expanded in the U.S.; Polymarket, by acquiring a licensed derivatives exchange, has re-entered the U.S. market and is seeking to migrate its global market operations entirely into the U.S. market.