Seattle Mariners vs. Kansas City Royals

Platform comparison

Active sub-markets

Market context

The Mariners and Royals meet with the market leaning slightly Seattle at 52% YES, but the latest shape of the matchup still looks close rather than directional. Kansas City have already shown they can turn this into a low-margin game: on 2 May, the Royals beat Seattle 3-2 in extra innings after Emerson Hancock struck out 14, which is a useful comparator for how narrow the scoring band can be between these clubs. That sort of result matters because a one-run game, or a late bullpen swing, is often enough to flip the side without the market’s pre-game edge changing much.

What traders should watch today is the starting pitcher announcement and any late lineup news, as both can move a short-moneyline market quickly. Recent preview material has pointed to a tight run environment, with Kansas City’s offence tending to keep totals suppressed and Seattle’s production against left-handed pitching a particular focus when the matchup leans that way. If either club rests a regular after a day game or confirms a late scratch, the implied win probability can shift more than the headline percentage suggests. The settlement window runs through next Friday, so any postponement would keep the market open until the game is completed.

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram, 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

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.

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.