Polymarket$3.29BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$404.59MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$27.64MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.
Updated Today
If the atmospheric concentration of CO2 is at least 460 before Jan 2030, then the market resolves to Yes.
As of March 18, 2026, the Kalshi odds for How bad will CO2 atmospheric concentration get before 2030? are: At least 440: 85%, At least 445: 44%, At least 450: 22%, At least 455: 12%, At least 460: 6%. These probabilities are derived from real-money trading and update in real time.
How bad will CO2 atmospheric concentration get before 2030? 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.
