September 21, 2025

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Kalshi Leads U.S. Prediction Market as Volume Soars Past Polymarket

Kalshi has firmly established itself as a frontrunner in the evolving landscape of prediction markets, demonstrating impressive trading volumes that far surpass its competition, Polymarket. Recent data from Dune Analytics highlights the trajectory of both platforms, signaling a significant uptick in U.S.-based trading activity.

In the week spanning September 11 to 17, Kalshi captured an impressive 62% of the overall trading volume within the on-chain prediction market sector, a clear indication of its growing dominance. During this period, Kalshi reported a staggering trading volume exceeding $500 million along with an average open interest of approximately $189 million. In contrast, Polymarket accounted for 37% of the market volume with a trading volume of $430 million and an average open interest figure of $164 million.

The data illustrates a significant variance in user engagement across both platforms. With a calculated open interest-to-volume ratio of 0.29 for Kalshi compared to Polymarket’s 0.38, it suggests that Kalshi’s clientele is more active in conducting trades, signaling a quicker turnaround of investment positions. Indeed, traders utilizing Polymarket tend to maintain their positions for extended durations, with many of its markets designed to accommodate longer-term predictions that can span weeks or months.

Despite Kalshi’s outstanding performance at present, Polymarket is positioning itself for growth within the U.S. market as well. The platform recently completed its acquisition of QCX, a regulated derivatives exchange, paving its way for a stronger presence in the regulated U.S. environment. This strategic move is reinforced by Polymarket’s recent launch of earnings-based markets in collaboration with the social investing platform Stocktwits. This initiative aims to provide shareholders with tools to hedge against earnings risk while simultaneously allowing analysts to gauge market sentiment instantaneously.

The competitive dynamics between Kalshi and Polymarket exemplify the evolving nature of prediction markets. As both platforms adapt and innovate, they offer unique insights into ongoing trends, serving as engaging platforms for traders interested in forecasting future events. Kalshi’s rise in volume signals a potential shift in user preferences toward quicker, more dynamic trading environments.

Regardless of the current standings, both Kalshi and Polymarket are expected to continue making strategic decisions to capture a larger portion of the market. As more traders explore the benefits and functionalities of each platform, the ongoing developments will play a crucial role in shaping the future of prediction markets in the United States.

With the competition heating up, it remains critical for both platforms to refine their offerings, foster user engagement, and expand their market reach as they operate in a rapidly transforming landscape. The next few months will be pivotal for Kalshi to maintain its momentum, while Polymarket works to solidify its footing in the regulated market space.