Seattle Mariners vs. Kansas City Royals

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Active sub-markets

Market context

The Seattle Mariners travel to Kansas City on 24 May for a regular-season MLB fixture scheduled to commence at 2:10 PM Eastern Time. This binary market resolves upon completion of the nine-inning contest, with settlement finalised by 31 May 2026. Should postponement occur, the market remains open until play concludes; cancellation without rescheduling or a tied result triggers 50-50 resolution. Official MLB statistics serve as the authoritative resolution source.

The 0% implied probability reflects either extreme illiquidity in early market formation or a technical pricing anomaly rather than substantive predictive consensus. Historical comparison to similar regular-season matchups between mid-table AL Central and AL West franchises typically generates 45–55% probability ranges, depending on recent form, injury status, and ballpark conditions. The Royals' home-field advantage at Kauffman Stadium conventionally shifts baseline expectations by 2–4 percentage points in their favour, though this effect varies materially with roster composition and seasonal trajectory.

Traders should monitor roster announcements through 23 May, particularly regarding starting pitcher assignments and injury updates from both clubs. The Mariners' recent performance against Kansas City, available through MLB.com's historical matchup data, provides relevant context for assessing relative strength. Weather conditions at Kansas City—notably wind direction and temperature—materially affect ball carry distance and thus run-scoring likelihood. Fixture timing at 2:10 PM local (3:10 PM ET) places the game in daylight hours, a variable affecting visibility and fatigue patterns across nine innings.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Where can I trade this market with the lowest fees?

On PolyGram, 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?

PolyGram 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.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.