Seattle Mariners vs. New York Yankees

Platform comparison

Market context

The Seattle Mariners travel to face the New York Yankees on 11 August at 7:05 PM ET in a regular-season matchup. Polymarket currently prices a Mariners victory at 46%, implying the Yankees hold a 54% edge in the conditional token market. This probability reflects the Yankees' stronger 2026 regular-season record and home-field advantage at Yankee Stadium, though the settlement window extends to 18 August to accommodate any postponements.

Historical matchups between these franchises show the Yankees have dominated recent encounters, winning roughly 60% of games over the past three seasons. The Mariners, however, possess a potent offensive lineup and have shown capability to compete against top-tier opponents in late-summer fixtures. The 46% probability assigned to Seattle suggests the market recognises their capacity to win on any given day whilst acknowledging the Yankees' structural advantages. Comparable August matchups involving the Mariners against AL East teams have typically settled within a 40–55% range for the visiting team, depending on roster health and pitching matchups.

Traders should monitor starting pitcher announcements, expected within 48 hours of the game, as this represents the primary catalyst affecting contract pricing. Recent injury reports from both organisations matter considerably—the Yankees have managed several key player absences throughout August, whilst the Mariners' bullpen depth remains a variable factor. Weather conditions at Yankee Stadium on game day may also shift probability, particularly wind direction affecting fly-ball outcomes. Any roster moves or roster transactions announced before first pitch could trigger repricing on Polygon-settled USDC positions.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.