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
If Jimmy Lee Tillman wins the nomination for the Republican Party to contest the 2026 Senate Illinois Senate seat, then the market resolves to Yes.
As of March 17, 2026, the Kalshi odds for Wil John Goodman be the Republican nominee for the Senate in Illinois? are: Don Tracy: 93%, Jeannie Evans: 6%, Doug Bennett: 2%, Casey Chlebek: 2%. These probabilities are derived from real-money trading and update in real time.
Wil John Goodman be the Republican nominee for the Senate in Illinois? is currently available on Kalshi. It is also available on Polymarket — 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.
