Seattle Mariners vs. New York Yankees

Platform comparison

Market context

The Seattle Mariners face the New York Yankees on 13 August at 1:35 PM ET in a regular-season matchup. The current crowd-implied probability of 41% for a Mariners victory reflects a modest underdog positioning, though the Yankees' recent form and roster depth typically command favourites' odds in such encounters. Settlement occurs on 20 August, allowing a week for postponements or make-up games; cancellations without rescheduling would trigger a 50-50 split resolution.

Historical matchups between these franchises show the Yankees have maintained a slight edge in head-to-head records over recent seasons, which partially explains the market's lean towards New York. However, the Mariners' 2024 campaign has produced competitive performances against top-tier opponents, and home-field advantage—if the game occurs in Seattle—introduces material variance. Traders should model baseline win probabilities around 45–55% for the favourite in such fixtures, meaning the current 41% for Seattle suggests either market overconfidence in the Yankees or genuine concern about Mariners' starting pitcher assignment.

Programmatic traders should monitor roster updates and injury reports through 12 August, particularly regarding starting pitchers and key position players. Weather conditions at the scheduled venue merit attention, as afternoon games in August can affect ball carry and play patterns. Official MLB injury bulletins and team announcements typically arrive 24 hours pre-game; conditional order logic should account for postponement scenarios, since the settlement window extends beyond the original date. Real-time line movement on major sportsbooks provides a secondary calibration point for algorithmic position-sizing.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Kalshi Fees, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.