Seattle Mariners vs. Detroit Tigers

Platform comparison

Active sub-markets

Market context

The Mariners travel to Detroit for a regular-season matchup on 7 June, with Polymarket currently pricing Seattle's victory at 49% on USDC via Polygon conditional tokens. This even split reflects genuine uncertainty between two clubs operating in different competitive windows. Seattle enters June with established playoff aspirations in the AL West, whilst Detroit has undergone significant roster reconstruction following recent years of rebuilding. The settlement window extends to 14 June at 17:40 UTC, providing ample time for any weather-related postponements to be resolved before final determination.

Historical context matters here. The Mariners have won roughly 52% of their matchups against Detroit over the past five seasons, a marginal edge that hardly justifies strong directional conviction. Both franchises sit near .500 records through early June in typical seasons, making head-to-head variance the dominant factor rather than structural quality gaps. The current 49-51 split suggests the market has already absorbed baseline strength differentials and is pricing primarily on pitching matchups and recent form.

Traders should monitor starting pitcher assignments, which typically release 24 hours before first pitch. Recent injury reports from either bullpen matter significantly—Detroit's relief corps has shown volatility this season, whilst Seattle's depth has been more consistent. Weather forecasts for Detroit in early June occasionally produce postponements, which would keep this contract open beyond the scheduled date. Any last-minute roster moves or IL placements in the days immediately preceding the game could shift conditional token prices meaningfully on Polygon.

Methodology

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

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Kalshi UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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.