Volume & Market Share Comparison (May–July 2026)
Published 7/7/2026, 3:21:04 PM
As of July 2026, Kalshi has seized total volume dominance over Polymarket, commanding approximately 58% to 69% of the total prediction market share. However, research indicates this dominance is primarily driven by sports betting (80% of Kalshi's volume) rather than crypto or political forecasting.
For crypto-specific forecasting, Polymarket remains the primary signal source, maintaining a 3x higher concentration of crypto-related markets (20% of its volume) compared to Kalshi (7%).
Volume & Market Share Comparison (May–July 2026)
| Metric | Kalshi | Polymarket |
|---|---|---|
| Monthly Volume (May 2026) | $17.91 Billion | $7.08 Billion |
| Market Share (Combined Flow) | ~58% - 69% | ~28% - 31% |
| Open Interest | $474.01 Million | $409.67 Million |
| Crypto Topic Concentration | 7% | 20% |
| Sports Topic Concentration | 80% | 39% |
| Primary Currency | Fiat (USD) | USDC Stablecoin |
| Regulatory Status | CFTC-Regulated (DCM) | Hybrid (Global Unregulated / US Regulated) |
Key Findings on Crypto Forecasting Use Cases
- Volume ≠ Crypto Relevance: Kalshi's massive volume growth is largely attributed to its Robinhood integration (27M+ users) and a pivot toward sports betting. In contrast, Polymarket's volume is more "dense" with crypto-native and geopolitical data, making it a superior tool for forecasting blockchain-specific events.
- Institutional vs. Retail Split: Kalshi's institutional volume grew 800% in the first half of 2026 [Source: https://news.kalshi.com/p/kalshi-raises-1-billion-22-billion-valuation-institutional-demand-surges], but this capital is focused on traditional event contracts like interest rates and economic data. Polymarket remains the preferred venue for institutional crypto hedging due to its USDC settlement and deeper liquidity in crypto-adjacent markets.
- Infrastructure Advantage: Polymarket's acquisition of Dome (YC 2025) has enabled the integration of AI agents for automated crypto prediction strategies [Source: https://x.com/WuBlockchain/status/2024661531666108607] [Source: https://www.tradingview.com/news/invezz:6b1505660094b:0-polymarket-acquires-dome-to-expand-prediction-market-developer-tools/]. This suggests Polymarket is evolving into a high-frequency data layer for crypto-native automated trading, while Kalshi is becoming a regulated retail betting hub.
- Regulatory Legitimacy: Kalshi's CFTC-regulated status provides a "safe harbor" for US institutions, but it faces significant state-level legal challenges. The Arizona AG filed criminal charges in March 2026 alleging an illegal gambling operation [Source: https://fortune.com/2026/03/18/arizona-first-state-kalshi-criminal-charges-illegal-gambling-betting-state-elections/], and the Nevada Gaming Control Board successfully extended bans on certain Kalshi contracts in early 2026 [Source: https://thenevadaindependent.com/article/kalshi-loses-appeal-nevada-judge-keeps-the-company-on-the-sidelines]. Polymarket's global, blockchain-based architecture allows it to bypass many of these localized frictions.
Conclusion
Kalshi's volume dominance signals a shift in the prediction market industry toward traditional sports betting and regulated retail finance, but it does not signal a shift in crypto forecasting use cases. Polymarket continues to lead in crypto-specific liquidity, technical integration, and high-conviction crypto-native signals. Analysts should monitor Kalshi for broad institutional sentiment but rely on Polymarket for blockchain-specific forecasting.