Polymarket$2.87BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$354.88MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$23.03MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.Compare Precipitation in Seattle 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 $5.8K in combined trading volume across 14 outcomes, this is one of the notable cross-platform prediction markets.
| Outcome | Polymarket | Kalshi | Spread |
|---|---|---|---|
A Above 2 inches | - | 99%±0 | - |
A Above 1 inch | - | 99%±0 | - |
A |
| - |
99%±0 |
| - |
A Above 4 inches | - | 98%+4.0 | - |
A Above 5 inches | - | 96%-1.0 | - |
A Above 6 inches | - | 80%-3.0 | - |
A Above 7 inches | - | 44%+3.0 | - |
 6-7" | 38%— | - | - |
 5-6" | 21%— | - | - |
 7-8" | 16%— | - | - |
 >8" | 6%— | - | - |
 4-5" | 6%— | - | - |
3-4" | 1%— | - | - |
 <3" | 1%— | - | - |
