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
As of March 18, 2026, the Polymarket odds for Max Arctic sea ice extent this winter? are: 14.2-14.4m sq km: 48%, <14m sq km: 8%, 14-14.2m sq km: 4%, 15m+ sq km: 2%. These probabilities are derived from real-money trading and update in real time.
Max Arctic sea ice extent this winter? is currently available on Polymarket. 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.
