Seattle Mariners vs. Baltimore Orioles

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Active sub-markets

Market context

The Mariners travel to Baltimore on 10 June for an evening matchup against the Orioles, with the settlement window extending to 17 June to accommodate any postponements. The 50-50 crowd probability reflects genuine uncertainty between two clubs positioned differently in the AL East standings, though recent form and roster availability will determine whether this equilibrium holds through to first pitch.

Over the past five seasons, matchups between these franchises have favoured neither side decisively—the Mariners and Orioles split their head-to-head contests fairly evenly, with outcomes heavily dependent on starting pitcher performance and whether either team's injury list has depleted key offensive contributors. The current even split in implied probability suggests traders are treating this as a genuine toss-up rather than pricing in any structural advantage, which aligns with historical precedent when both teams field competitive lineups.

Watch for roster updates in the 48 hours before the game, particularly any late-breaking injuries to either team's starting pitcher or primary offensive anchors. Baltimore's recent performance against AL East rivals and Seattle's record in road games during June will carry weight, though these factors remain fluid. The Orioles' home-field advantage at Camden Yards typically provides a modest edge in June matchups, yet this hasn't yet shifted the market from parity, suggesting traders are discounting ballpark effects against other variables still in flux.

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

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 Prediction Today, 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.

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.

What does it cost to trade on Prediction Today?

Zero. Prediction Today 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.