Seattle Mariners vs. Athletics

Platform comparison

Active sub-markets

Market context

The Seattle Mariners face the Oakland Athletics on 27 May at 3:05 PM ET in what Polymarket currently prices at 0% YES, meaning traders are assigning negligible probability to a Mariners victory. This extreme pricing reflects the Athletics' status as one of baseball's weakest franchises, yet the 0% valuation warrants scrutiny given that even heavily favoured teams lose roughly one match in four across a season. The settlement window extends to 3 June, providing a six-day buffer for postponements or make-up games under MLB's standard protocols.

Historical context suggests such extreme probabilities often reflect liquidity constraints rather than genuine certainty. In comparable MLB matchups between strong and weak teams, conditional token pricing on Polygon frequently compresses towards extremes when trading volume remains thin. The Mariners, despite recent competitive struggles, retain a roster capable of beating any opponent on a given day; conversely, the Athletics' rebuilding phase has produced inconsistent results that occasionally yield upsets. Previous seasons show that teams with sub-.400 winning percentages still capture roughly 35–40% of games against .500-or-better opponents.

Traders should monitor roster updates through 27 May, particularly injury announcements affecting either starting pitcher. Recent Athletics transactions and Mariners lineup decisions could shift underlying win probabilities meaningfully. The 0% pricing leaves substantial arbitrage potential if either team announces significant personnel changes or if weather forecasts suggest conditions favouring one side's strengths.

Methodology

This page reviews Seattle Mariners vs. Athletics across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Kalshi UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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.

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 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.