Trading volumes on prediction market platforms Kalshi and Polymarket have come under scrutiny due to unusual activity patterns that have raised concerns about market quality and the potential inflation of reported volumes [1]. On Polymarket's international exchange, which operates outside the oversight of U.S. regulators, observers noted that contracts with lower odds of occurring are seeing greater trading activity compared to those with higher probabilities, particularly in markets related to elections, sports, and central bank decisions [1].
On Kalshi, a user flagged an abnormal pattern on the platform's perpetual futures market for the ether cryptocurrency on September 20. Trades of approximately $5,500 accounted for a significant portion of transactions, with nearly half of the dollar volume in Kalshi's ether perpetuals coming from trades sized between $5,495 and $5,505 within a 24-hour period. This volume was unusually high relative to the actual resting liquidity in the market [1].
These developments have led some industry observers to question whether the companies are reporting inflated trading volumes or, in a worst-case scenario, experiencing wash trading, where traders collude to artificially boost activity. Both Kalshi and Polymarket have denied any wash trading or inorganic activity on their platforms [1]. Legal experts, such as Tamika Bent from K&L Gates, emphasized that designated contract markets are expected to monitor and investigate unusual volume and market disruptions to protect market integrity [1].
The scrutiny comes as Polymarket is reportedly raising funds at a valuation exceeding $20 billion following the launch of its U.S. exchange in May, while Kalshi is said to be in talks for a $40 billion valuation after debuting its perpetual futures product in June. Both companies have highlighted surging trading volumes as evidence of their growing popularity, which supports their high valuations and potential initial public offerings as soon as next year. However, the accuracy of these volume figures is now under increased examination as the companies consider moves to the public markets [1].
CONCLUSION
Unusual trading patterns on Kalshi and Polymarket have raised questions about the integrity of reported trading volumes, especially as both companies seek high valuations and potential IPOs. While both firms deny any wash trading or artificial activity, the accuracy of their volume metrics is under heightened scrutiny as they pursue further growth and public market entry.