Scrutiny grows over trading volumes on prediction markets Kalshi and Polymarket

Trading volumes on prediction market platforms Kalshi and Polymarket are drawing increased scrutiny, as experts debate whether the reported figures accurately reflect organic trading activity, according to CNBC.

Both platforms have experienced rapid growth in recent periods, as prediction markets, where users can wager on the outcome of real-world events, have gained mainstream attention. That growth has been accompanied by questions about the nature of some of the trading occurring on certain products.

Questions over unusual patterns

CNBC's report indicated that unusual trading patterns on some products offered by Kalshi and Polymarket have raised questions among market observers about whether the volumes represent genuine investor interest or are influenced by other factors, such as automated trading activity or incentive structures that encourage high-frequency trading regardless of underlying conviction.

Neither Kalshi nor Polymarket was reported to have issued a detailed public response addressing the specific concerns raised about their trading volumes.

Prediction markets have expanded significantly as both platforms have sought to establish themselves as legitimate venues for trading on outcomes ranging from political elections to economic indicators and other events. Kalshi operates as a regulated exchange in the United States, while Polymarket has operated largely outside traditional US regulatory frameworks, drawing additional attention to differences in oversight between the two platforms.

The scrutiny comes as regulators and industry observers continue to examine how prediction markets should be treated under existing financial rules, given their hybrid nature that combines elements of betting markets with financial derivatives trading.

As trading volumes on both platforms have surged, questions about data integrity and market manipulation have become a recurring theme in coverage of the sector, mirroring debates that have previously played out in other fast-growing, lightly regulated corners of financial markets. It was not immediately clear whether any formal regulatory inquiry into the trading patterns described had been opened.