Seattle Mariners vs. Athletics

Platform comparison

Active sub-markets

Market context

The Seattle Mariners host the Oakland Athletics on 26 May at 9:40PM ET in a regular-season matchup. This market resolves to the Mariners if they win, to the Athletics if Oakland prevails, and splits 50-50 only if the game is postponed without completion or cancelled entirely. The settlement window extends to 3 June 2026, providing a five-day buffer for weather delays or rescheduling.

The 50% implied probability reflects a genuine competitive balance between these franchises in recent seasons. The Mariners have maintained a stronger win percentage over the past three years, though the Athletics have shown capacity for upset performances in divisional play. Historical matchups between AL West opponents at this stage of the season typically show modest home-field advantage—roughly 52-55% for the host team—suggesting the current odds appropriately price in Seattle's home status without overweighting it.

Traders monitoring this market should track roster announcements through 25 May, particularly any late injuries to starting pitchers or key position players. The Athletics' recent trade activity and bullpen depth will influence late-market movement. Weather forecasts for Seattle on game day warrant attention, as precipitation could affect play style and scoring patterns. For programmatic approaches, conditional orders tied to official lineup announcements or weather alerts would capture meaningful shifts in the final hours before first pitch. The official MLB box score serves as the sole resolution source, eliminating ambiguity around tie-breaking or disputed calls.

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 Polymarket Bot UK — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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?

On Polymarket Bot 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?

Polymarket Bot 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Bot UK triggers a quick verification flow that finishes in minutes.