This analysis predates a shift — Inter Miami CF now leads. The live table below has current odds.
Polymarket and Kalshi are essentially in lockstep on this market: Nashville SC sits at 16% on both books, and the top-two spots are a virtual coin flip, with Polymarket giving Inter Miami a slim edge (21% Miami vs 19% Vancouver) while Kalshi flips the order (22% Vancouver vs 21% Miami). This tight clustering reflects Miami's title-defense cooling off from earlier-season frontrunner status as Vancouver, last year's runner-up bolstered by Thomas Müller, has surged into a genuine co-favorite.
Analysis written Sep 4, 2026 · odds in the tables below are live
| Outcome |  Polymarket |  Kalshi | Spread |
|---|---|---|---|
I Inter Miami CF | - | - | |
V Vancouver Whitecaps FC | 0.1pp spread | ||
M Miami | - | - | |
N Nashville SC | 0.4pp spread | ||
L Los Angeles FC | 3.5pp spread | ||
C Chicago Fire FC | 0.6pp spread | ||
H Houston Dynamo FC | 0.3pp spread | ||
F FC Dallas | 0.4pp spread | ||
S St. Louis City SC | - | - | |
S Saint Louis | - | - | |
F FC Cincinnati | 1.8pp spread | ||
C Charlotte FC | 0.8pp spread | ||
O Orlando City SC | 1.9pp spread | ||
S San Jose Earthquakes | 2.3pp spread | ||
P Portland Timbers | 0.8pp spread | ||
P Philadelphia Union | 0.9pp spread | ||
M Minnesota United FC | 1.3pp spread | ||
R Real Salt Lake | 0.5pp spread | ||
N New England Revolution | 0.5pp spread | ||
N New York City FC | 0.3pp spread | ||
S Seattle Sounders FC | 0.3pp spread | ||
N New York Red Bulls | - | - | |
S San Diego FC | 0.1pp spread | ||
D DC | - | - | |
N New York RB | - | - | |
L Los Angeles Galaxy | - | - | |
C Columbus Crew | 0.1pp spread | ||
C Colorado Rapids | 0.4pp spread | ||
T Toronto FC | 0.7pp spread | ||
S Sporting Kansas City | 0.9pp spread | ||
C CF Montréal | 0.9pp spread | ||
A Austin FC | 0.9pp spread | ||
A Atlanta United FC | 0.9pp spread | ||
L LA Galaxy | - | - | |
D D.C. United | - | - |
Los Angeles FCKalshiPolymarketCost: 97¢ per pair → pays $1 at resolution. Gross spread 3.5pp — before fees, and only at the top of what may be a thin book; both platforms charge trade fees and capital locks up until the market resolves, so the executable edge is usually smaller (often zero).
View all arbsBackground, methodology, and platform context
Compare MLS Cup Winner 2026 prediction market odds side by side across Polymarket, Kalshi. Platforms show similar odds, with an average spread of just 0.6pp. Close agreement often signals strong market consensus. With $21.74M in combined trading volume across 35 outcomes, this is one of the most actively traded cross-platform prediction markets.
Descriptions normalized for comparison (outcome names replaced with [OUTCOME])
This market will resolve according to the team that wins the 2026 MLS Cup. If at any point it becomes impossible for a listed team to win the 2026 MLS Cup per the rules of MLS (e.g. they are mathematically eliminated), the corresponding market will resolve to “No”. If the 2026 MLS season is cancelled, postponed after December 31, 2026 ET, or there is otherwise no winner declared within that timeframe, this market will resolve to “Other”. The primary resolution source will be official information from Major League Soccer; however, a consensus of credible reporting may also be used.
If [OUTCOME] is the 2026 Major League Soccer (MLS) Cup Champion, then the market resolves to Yes.
Kalshi is not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Governing League. All trademarks, logos, and brand names are the property of their respective owners.
Different platforms may use different resolution criteria, data sources, and settlement timelines.
