Dota 2 esports volume hit $204M on prediction markets, but few profited
Esports prediction markets generated $204 million in volume during the Dota 2 championship, with Polymarket capturing roughly 90% of that total. Research firm Predictbook found that only 5,004 Polymarket accounts turned a profit trading contracts on The International 2026 by buying and selling positions. The top 10% of traders captured outsized returns. Kalshi recorded nearly the same number of trades as Polymarket at 586,845, suggesting much smaller average trade sizes on the CFTC-regulated platform.
The 5,004 profitable accounts out of Polymarket's much larger user base show that event-contract trading rewards market timing over directional accuracy. This structure favors sophisticated traders who scalp volatility, while casual users who hold correct predictions still lose money to fees and spreads. Kalshi, the similar trade count with far smaller implied volume suggests its user base is retail-heavy and price-sensitive, a different liquidity profile than Polymarket's whale-driven depth.
The split creates two acquisition targets: Kalshi can market itself as the accessible regulated venue, while Polymarket attracts active traders seeking edge. Both models face the same risk. If retail users learn that being right pays less than trading the odds, event contracts lose their core promise of pure predictions. Platforms must then compete on derivatives features, not forecasting accuracy, blurring the line from prediction markets to binary options.