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.Compare Acquisition of Greenland by the United States prediction market odds side by side across Polymarket, Kalshi. Platforms show similar odds, with an average spread of just 0.5pp. Close agreement often signals strong market consensus. With $30.42M in combined trading volume across 3 outcomes, this is one of the most actively traded cross-platform prediction markets.
| Outcome | Polymarket | Kalshi | Spread |
|---|---|---|---|
B Before January 21, 2029 | - | 39%±0 | - |
 Yes | 10%±0 | 11%-1.0 | 1.4pp spread |
B Before April 2026 | - | 1%±0 | - |
