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 NCAA Men's Basketball Tournament Winner 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 $4.29M in combined trading volume across 76 outcomes, this is one of the most actively traded cross-platform prediction markets.
| Outcome | Polymarket | Kalshi | Spread |
|---|---|---|---|
# #1 seed | - | 68%+3.0 | - |
 Duke | 20%-1.0 | - | - |
|
19%— |
| - |
| - |
Arizona | 18%+2.3 | - | - |
# #2 seed | - | 17%-2.0 | - |
Florida | 10%±0 | - | - |
Houston | 9%— | - | - |
# #3 seed | - | 8%-2.0 | - |
# #5 through #8 seed | - | 6%+1.0 | - |
Iowa State | 4%±0 | - | - |
Purdue | 4%±0 | - | - |
# #4 seed | - | 4%-1.0 | - |
Illinois | 4%±0 | - | - |
Connecticut | 3%±0 | - | - |
# #9 through #16 seed | - | 2%±0 | - |
Michigan State | 1%±0 | - | - |
Gonzaga | 1%±0 | - | - |
Arkansas | 1%±0 | - | - |
Kansas | 1%-1.1 | - | - |
Virginia | 1%±0 | - | - |
St John's | 1%— | - | - |
Vanderbilt | 1%±0 | - | - |
Wisconsin | 1%— | - | - |
Tennessee | 1%±0 | - | - |
Alabama | 1%±0 | - | - |
Louisville | 1%±0 | - | - |
Nebraska | 0%±0 | - | - |
UCLA | 0%±0 | - | - |
Texas Tech | 0%— | - | - |
BYU | 0%±0 | - | - |
Kentucky | 0%±0 | - | - |
South Florida | 0%— | - | - |
Georgia | 0%— | - | - |
Ohio State | 0%— | - | - |
Villanova | 0%— | - | - |
Miami (FL) | 0%— | - | - |
Texas A&M | 0%— | - | - |
TCU | 0%— | - | - |
St. Mary's | 0%— | - | - |
Iowa | 0%— | - | - |
Missouri | 0%— | - | - |
North Carolina | 0%±0 | - | - |
NC State | 0%±0 | - | - |
Santa Clara | 0%— | - | - |
Auburn | 0%±0 | - | - |
Creighton | 0%— | - | - |
Miami (OH) | 0%— | - | - |
Prairie View A&M | 0%— | - | - |
Cal Baptist | 0%— | - | - |
LIU | 0%— | - | - |
Kennesaw State | 0%— | - | - |
Wright State | 0%— | - | - |
Texas | 0%— | - | - |
Saint Louis | 0%±0 | - | - |
Furman | 0%— | - | - |
Tennessee State | 0%— | - | - |
Norhtern Iowa | 0%— | - | - |
SMU | 0%— | - | - |
Clemson | 0%±0 | - | - |
Utah State | 0%— | - | - |
Hofstra | 0%— | - | - |
North Dakota State | 0%— | - | - |
McNeese | 0%— | - | - |
High Point | 0%— | - | - |
Howard | 0%— | - | - |
Akron | 0%— | - | - |
Penn | 0%— | - | - |
Troy | 0%— | - | - |
UCF | 0%— | - | - |
Hawaii | 0%— | - | - |
Siena | 0%— | - | - |
Queens | 0%— | - | - |
VCU | 0%— | - | - |
Lehigh | 0%— | - | - |
UMBC | 0%— | - | - |
Idaho | 0%— | - | - |
