Kalshi and Polymarket Face Scrutiny Over Trading Volumes Amid Rapid Growth
Trading volumes for certain products on prediction market platforms Kalshi and Polymarket have raised concerns among industry observers, who suspect the figures may be inflated. On Polymarket’s international exchange—unregulated in the U.S.—contracts with lower odds of occurring show disproportionately high activity compared to those with higher probabilities. A user also highlighted unusual trading patterns on Kalshi's ether perpetual futures contracts, where a large portion of volume came from trades near $5,500. These anomalies have led some experts and traders to question whether the platforms are experiencing inorganic or potentially manipulative activity like wash trading. Both companies deny any such practices occurring on their platforms and claim these patterns reflect genuine market behavior. Kalshi attributes its high-volume days to a large number of active users, while Polymarket suggests that sharp traders are correcting pricing imbalances across contracts. As both firms pursue higher valuations in private markets—Kalshi at $40 billion and Polymarket above $20 billion—and consider potential IPOs next year, the accuracy of their reported trading volumes is under increased scrutiny. Market integrity experts emphasize the importance of monitoring for abnormal volume patterns to ensure fair market conditions. If these concerns persist or intensify as both companies move toward public listings, it could impact investor confidence and valuation expectations.
Topics: Kalshi Polymarket prediction markets trading volume anomalies wash trading concerns