Polymarket$2.32BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$350.67MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$18.48MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.
Updated Today
As of March 17, 2026, the Polymarket odds for #1 song on US Spotify this week? (March 20) are: Stateside + Zara Larsson - PinkPantheress, Zara Larsson: 88%, American Girls - Harry Styles: 20%, Babydoll - Dominic Fike: 4%. These probabilities are derived from real-money trading and update in real time.
#1 song on US Spotify this week? (March 20) 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.
