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 Bitcoin price in March prediction market odds side by side across Polymarket, Kalshi. Platforms show similar odds, with an average spread of just 0.0pp. Close agreement often signals strong market consensus. With $14.73M in combined trading volume across 14 outcomes, this is one of the most actively traded cross-platform prediction markets.
| Outcome | Polymarket | Kalshi | Spread |
|---|---|---|---|
B Before June 2026 | - | 5%±0 | - |
B Before May 2026 | - | 2%-1.0 | - |
B |
| - |
1%±0 |
| - |
B Before February 2026 | - | 1%±0 | - |
B Before September 2025 | - | 1%±0 | - |
B Before December 2025 | - | 1%±0 | - |
B Before April 2025 | - | 1%±0 | - |
B Before July 2025 | - | 1%±0 | - |
B Before February 2025 | - | 1%±0 | - |
B Before November 2025 | - | 1%±0 | - |
B Before January 2026 | - | 1%±0 | - |
B Before March 2026 | - | 1%±0 | - |
B Before October 2025 | - | 1%±0 | - |
 Yes | 0%— | 1%±0 | 0.7pp spread |
