Prediction markets trading volume had been tracking monthly gains as the sector gains popularity among short-term traders, but competition is also increasing. Monthly trading volume on the Polymarket prediction market fell by about 8.9% in April, the first decline in month-to-month activity since August as rivals like Kalshi increased their market share. Polymarket and its US-based trading application collectively generated more than $10.2 billion in volume in April, compared to more than $11.2 billion in March, according to data from Dune Analytics. However, rival Kalshi’s April trading volume surged by about 13%, climbing to about $14.8 billion, Dune data shows. The total monthly trading volume for prediction markets also increased to about $29.8 billion in April from about $26.5 billion in March, an increase of about 12.4%. Monthly volume figures for prediction markets. Dune Polymarket’s volume drop came as the company attempts to fully integrate US markets again, amid increased legal and regulatory scrutiny of prediction markets by US lawmakers after the sector experienced a meteoric growth during the 2024 elections. To be sure, prediction markets are proving to be attractive to a slew of new competitors.