Polymarket$2.36BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$352.10MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$18.72MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.
Updated Today
Winner: Don Tracyon Mar 17, 2026
As of March 17, 2026, the Polymarket odds for Illinois Republican Senate Primary Winner are: Don Tracy: 91%, Jeannie Evans: 6%. These probabilities are derived from real-money trading and update in real time.
Illinois Republican Senate Primary Winner is currently available on Polymarket. It is also available on Kalshi — compare odds across both platforms on our cross-platform comparison page.
Prediction market odds reflect the aggregate opinion of traders who risk real money on outcomes. The price of a share (e.g., 65¢) represents the market's implied probability (65%). Prices move as traders buy and sell based on new information, polls, and analysis.
