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 a representative of the Republican party is sworn in as a Senator of California for the term beginning in 2029, then the market resolves to Yes.
As of March 18, 2026, the Kalshi odds for Will Democratics win the Senate race in California? are: Democratic party: 90%, Republican party: 8%. These probabilities are derived from real-money trading and update in real time.
Will Democratics win the Senate race in California? 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.
