The prediction markets sector continues to show impressive momentum. In the second quarter of 2026, total trading volume reached an all-time high of $109 billion. This marks the fourth consecutive quarterly increase, and the segment is firmly establishing itself as one of the fastest-growing categories in the crypto industry.
Quarterly growth was 39% compared to the first quarter, while on an annualized basis, trading volume surged 18-fold. This growth trajectory points to structural changes: the market has ceased to be merely a niche entertainment and is evolving into a full-fledged financial instrument.
Change of leadership and diversification
By the end of June, total open interest (OI) in prediction markets stood at $1.8 billion, increasing by 54% over the month. The key driver was the start of the 2026 FIFA World Cup in the USA, Canada, and Mexico. However, the structure of OI has become much more diversified.
For the first time in a long while, the Kalshi platform surpassed Polymarket in this metric, although the latter still maintains a significant lead over other participants. Weekly trading volume reached $3.1 billion, of which Kalshi accounted for $2.6 billion and Polymarket only $492 million. Thus, Kalshi controls over 80% of the market by volume.
Excluding sports markets, the picture is more balanced: here, Kalshi and Polymarket share the market almost equally, although the former is rapidly increasing its share, having gained 8.5% since the start of the quarter. This indicates a higher speed of position rotation and an active speculative flow on Kalshi. Its leadership is linked not so much to displacing Polymarket as to capturing the highest-speed part of the market.
Politics and sports: division of spheres of influence
Political markets remain Polymarket's domain — it accounted for about 96% of all trading in this segment for the quarter. Trading volume on political markets reached $5.7 billion, of which $5.5 billion was provided by Polymarket. However, this is still below the peak of the fourth quarter of 2024.
The World Cup markets, on the other hand, showed explosive growth and turned out to be more balanced. Kalshi leads with a volume of $2.8 billion, but Polymarket holds second place with $1.8 billion. Since the start of the tournament, daily volume in prediction markets has increased by approximately 75%.
Investment interest: the segment attracts capital
In the first half of 2026, prediction markets became the most funded crypto category, receiving $1.85 billion and surpassing exchanges ($1.57 billion) and DeFi projects ($1 billion). This confirms that investors are increasingly viewing the segment as major financial infrastructure rather than a niche direction.
My opinion: Prediction markets are going through a bifurcation point. Further growth will be determined not so much by attracting new users as by the depth of liquidity and the ability of platforms to service institutional capital. Kalshi has already shown that it can eat into Polymarket's share through speed, but the question of the sustainability of this trend remains open.