Polymarket$3.40BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$394.55MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$27.79MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.Compare 2023 NBA Finals: Golden State Warriors vs. Boston Celtics 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 $1.08M in combined trading volume across 3 outcomes, this is one of the most actively traded cross-platform prediction markets.
| Outcome | Polymarket | Kalshi | Spread |
|---|---|---|---|
B Boston | - | 85%±0 | - |
 Yes | 52%— | - | - |
G |
| - |
17%+1.0 |
| - |
