September 21, 2025

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Kalshi Dominates Prediction Market Volume as U.S. Trading Activity Intensifies

In a striking development within the prediction market sphere, Kalshi has taken a commanding lead over its primary competitor, Polymarket. Recent data indicates that from September 11 to 17, Kalshi secured an impressive 62% of the total trading volume in on-chain prediction markets. This surge comes amid a broader increase in trading activities across the United States.

According to figures provided by Dune Analytics, Kalshi’s weekly trading volume exceeded $500 million. In contrast, Polymarket recorded a total volume of $430 million within the same timeframe, illustrating the growing preference for Kalshi among traders. Kalshi’s average open interest also showed a robust performance, standing at approximately $189 million, compared to Polymarket’s average of $164 million.

This disparity in trading engagement can be further understood through the average open interest-to-volume ratio. Kalshi reported a ratio of 0.29, indicating a brisk trading environment where users are frequently engaging with the platform. Polymarket, on the other hand, registered a higher ratio of 0.38, a reflection of longer-term market positions that often restrict user capital and prolong trading cycles.

The differences in trading strategies between the two platforms are significant. Kalshi’s mechanisms allow for quicker turnaround of funds, appealing to traders who prefer rapid exchanges. In contrast, Polymarket’s focus on longer-term market predictions can lead to funds being held for extended durations, which, while potentially advantageous for some, may not cater to the demands of all users.

Despite Kalshi’s current dominance, Polymarket is not retreating. The platform is actively enhancing its presence in the U.S. financial landscape. Recently, they successfully completed the acquisition of QCX, a regulated derivatives exchange, to bolster their compliance and operational capabilities in the U.S. market. This strategic move might position Polymarket more favorably against growing competition.

In addition to these developments, Polymarket has rolled out new earnings-based markets in partnership with the social investing platform Stocktwits. This initiative aims to provide stockholders an avenue to hedge against earnings volatility while offering analysts real-time insights into market sentiment, potentially attracting a broader user base.

The competitive landscape of prediction markets continues to evolve, with both Kalshi and Polymarket striving to refine their offerings and capture the interest of traders. As user engagement rises coupled with innovative product launches, the potential for growth in this sector remains substantial. It will be crucial for both platforms to strike a delicate balance between regulatory compliance, user engagement, and trading efficiency to maintain their positions in the rapidly changing market.

As it stands, Kalshi’s robust trading environment has set a high bar for Polymarket, prompting the latter to innovate and expand strategically. The coming weeks will likely provide further insights into how these two platforms continue to navigate the complexities of the U.S. prediction market landscape.