MLB World Series odds make the Los Angeles Dodgers the favorite at 30.80% on Kalshi and 31.00% on Polymarket as of September 12, 2026 at 20:33 UTC. The New York Yankees carry the widest spread among the six matched teams below at 1.80 percentage points. These are market-implied probabilities, not predictions or trading advice.
Kalshi and Polymarket both list team contracts for the 2026 baseball championship. The markets stay live through the postseason until each team wins or can no longer win under the contract rules. Kairos puts both venue books together. Check Kairos data before trading because prices and available size move after this timestamp.
What are the MLB World Series odds right now?
The Los Angeles Dodgers led both verified snapshots. Their contract last traded at 30.80 cents on Kalshi and 31.00 cents on Polymarket. Milwaukee followed at 15.60 cents and 14.00 cents. The New York Yankees ranked third in this matched set at 11.80 cents and 10.00 cents, creating a 1.80 point venue gap.
| Contract | Kalshi price | Polymarket price | Implied probability | Cross-venue spread |
|---|---|---|---|---|
| Los Angeles Dodgers | 30.80 cents | 31.00 cents | 30.80% Kalshi, 31.00% Polymarket | 0.20 percentage points |
| Milwaukee Brewers | 15.60 cents | 14.00 cents | 15.60% Kalshi, 14.00% Polymarket | 1.60 percentage points |
| New York Yankees | 11.80 cents | 10.00 cents | 11.80% Kalshi, 10.00% Polymarket | 1.80 percentage points |
| Tampa Bay Rays | 8.90 cents | 9.10 cents | 8.90% Kalshi, 9.10% Polymarket | 0.20 percentage points |
| Atlanta Braves | 5.40 cents | 6.10 cents | 5.40% Kalshi, 6.10% Polymarket | 0.70 percentage points |
| Philadelphia Phillies | 5.20 cents | 6.30 cents | 5.20% Kalshi, 6.30% Polymarket | 1.10 percentage points |
The table uses the latest completed trade from each venue's public event feed. A 30.80-cent Yes contract represents a 30.80% market-implied probability before fees. Last trade does not guarantee the next fill. Traders need the current bid, ask, and available quantity. The implied probability explainer shows how cents map to a one-dollar settlement value.
Where can traders trade MLB championship markets?
Kalshi and Polymarket both list named-team contracts for the 2026 championship. Kalshi calls its event Pro Baseball Champion. Polymarket calls its event MLB World Series Champion 2026. The labels differ, but the six rows above match the same team and 2026 title outcome across both venues.
Kalshi publishes its transaction-fee method and shows charges in the order flow. Polymarket publishes fee documentation and market-level fee records. Traders should verify the live order ticket. A 0.20 point difference between completed trades can vanish inside the current bid-ask spread. Even the 1.80 point gap needs executable size on both books.
Kairos aggregates the two venue books with execution beside the data. The baseball cluster also tracks MLB MVP odds and Cy Young odds. Championship probability. Award probability. One terminal.
How do the 2026 World Series markets resolve?
Kalshi resolves each named contract Yes if that team wins the 2026 Pro Baseball Championship. Its Dodgers rule states: "If Los Angeles D wins the 2026 Pro Baseball Championship, then the market resolves to Yes." Each other team contract applies the same winner test to its listed team.
Polymarket resolves the event according to the team that wins the 2026 MLB World Series. Its rules state: "If at any point it becomes impossible for a listed team to win the 2026 MLB World Series per the rules of MLB, the corresponding market will resolve to No." Polymarket names official MLB information as its primary resolution source.
Why do Kalshi and Polymarket show different World Series odds?
Kalshi and Polymarket show different World Series odds because their traders use separate order books. The Yankees last traded 1.80 points higher on Kalshi in this snapshot. The Dodgers differed by 0.20 points. Those are comparisons of completed trades, and neither figure proves that the gap remains available at the current bid and ask.
Team labels and season must match before comparing price. Liquidity can shift quickly as standings and playoff paths change. Fees, spreads, available quantity, and settlement wording determine the real trade. Read the rule and inspect the book before sending an order. Kairos keeps both venue books in one workflow. Start trading on Kairos.
Sources
Kalshi 2026 championship market Kalshi public event API Polymarket 2026 World Series market Polymarket public event API Kalshi fee documentation Polymarket fee documentation