The prediction markets sector continues to demonstrate phenomenal growth. By the end of the second quarter of 2026, total trading volume reached an all-time high of $109 billion. This marks the fourth consecutive quarter of growth, and the segment is firmly establishing itself as one of the fastest-growing categories in the crypto economy.
Analytics show that trading volume increased by 39% compared to the first quarter, and on an annualized basis, growth was 18-fold. The key takeaway I draw from this data is that the market is no longer just a battle for users. We are witnessing a clear vertical specialization of platforms, where each occupies its own niche.
Change in Leadership and Capital Diversification
Total open interest (OI) in prediction markets reached $1.8 billion by the end of June. This metric, reflecting the amount of capital tied up in open positions, grew by 54% over the month. The main catalyst was the start of the 2026 FIFA World Cup in the United States, Canada, and Mexico.
The structure of open interest has become more diversified. For the first time, the Kalshi platform, which had long competed with Polymarket, took the lead in this metric. At the same time, Polymarket maintains a significant lead over other participants, despite a decline in its own OI.
Kalshi Dominates, Polymarket Holds Its Niche
Looking at weekly trading volume excluding sports, the numbers are impressive: $3.1 billion. Of this, Kalshi accounted for $2.6 billion, while Polymarket accounted for only $492 million. Thus, Kalshi controls over 80% of the market by this metric. This indicates faster position rotation and an active speculative flow on the platform. Its leadership is not about displacing Polymarket but capturing the highest-speed segment of the market.
However, in terms of open interest excluding sports, the picture is more balanced. Here, Kalshi and Polymarket share the market almost equally, although the former platform is rapidly increasing its share, adding 8.5% since the start of the quarter.
Politics and Sports: Dividing Spheres of Influence
Political markets remain Polymarket's stronghold. 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 came from Polymarket. However, this is still below the peak of the fourth quarter of 2024.
World Cup markets showed explosive growth and were 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 on prediction markets has increased by approximately 75%.
Investors Vote with Capital
Interest in the segment is also confirmed by capital inflows. 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 the AI sector ($1 billion).
My conclusion: we are witnessing not just hype but the formation of a mature financial infrastructure. Prediction markets have ceased to be a niche pastime. I am confident that in the coming quarters, we will see further consolidation and the emergence of new verticals, especially in the realm of macroeconomic and corporate events.