Polymarket$3.18BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$401.77MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$25.30MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.
Updated Today
If Samuel Alito retires as Supreme Court Justice before Jan 1, 2027, then the market resolves to Yes.
As of March 18, 2026, the Kalshi odds for Will Samuel Alito retires the Supreme Court in before April? are: Before Jan 1, 2027: 58%, Before Sep 1, 2026: 42%, Before Jul 1, 2026: 9%. These probabilities are derived from real-money trading and update in real time.
Will Samuel Alito retires the Supreme Court in before April? is currently available on Kalshi. Check PredictMarketCap for cross-platform availability as new markets are added regularly.
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.
