Polymarket and Kalshi's combined historical trading volume has surpassed $150 billion.

CoinFeed reported on May 2nd that, according to The Block, the combined historical trading volume of prediction market platforms Polymarket and Kalshi surpassed $150 billion in April, ending a seven-month streak of record-high monthly trading volume since September of last year. Polymarket's active traders fell to approximately 643,000 in April, down from over 733,000 in March. Both USD trading volume and notional trading volume on its global platform declined, but its US subsidiary, currently under development, and Kalshi as a whole continued to grow. Kalshi rapidly expanded in the US after winning its lawsuit against the CFTC in 2024, gaining permission to offer election contracts; Polymarket returned to the US through the acquisition of a warranted derivatives exchange and is seeking to relocate its entire global market to the US.