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 2026 NBA Eastern Conference Championship prediction market odds side by side across Polymarket, Kalshi. Platforms show similar odds, with an average spread of just 1.0pp. Close agreement often signals strong market consensus. With $322.0K in combined trading volume across 15 outcomes, this is one of the notable cross-platform prediction markets.
Boston CelticsPolymarketKalshiCost: 97¢ per pair → pays $1 at resolution. Gross spread 2.9pp before fees.
View all arbs| Outcome | Polymarket | Kalshi | Spread |
|---|---|---|---|
Boston Celtics | 32%±0 | 35%-2.0 | 2.9pp spread |
 Cleveland Cavaliers | 20%+3.0 |
21%-1.0 |
| 1.5pp spread |
 New York Knicks | 17%-1.0 | 17%±0 | 0.5pp spread |
 Detroit Pistons | 14%-2.0 | 17%+3.0 | 2.5pp spread |
 Charlotte Hornets | 3%+0.5 | 4%+1.0 | 0.7pp spread |
 Orlando Magic | 3%+0.9 | 3%±0 | 0.2pp spread |
 Atlanta Hawks | 3%±0 | 3%+1.0 | 0.1pp spread |
 Miami Heat | 3%±0 | 3%±0 | 0.4pp spread |
 Toronto Raptors | 3%-1.4 | 2%±0 | 0.7pp spread |
 Philadelphia 76ers | 2%±0 | 3%+1.0 | 1.4pp spread |
 Milwaukee Bucks | 0%±0 | 1%±0 | 0.8pp spread |
 Chicago Bulls | 0%— | 1%±0 | 0.9pp spread |
 Brooklyn Nets | 0%— | 1%±0 | 1.0pp spread |
 Washington Wizards | 0%— | 1%±0 | 1.0pp spread |
 Indiana Pacers | 0%— | 1%±0 | 1.0pp spread |
