Seattle Mariners vs. Baltimore Orioles

Platform comparison

Active sub-markets

Market context

The Mariners travel to Baltimore for a 7:05pm ET start on 11 June, with the settlement window extending to 18 June to accommodate any postponements. The 100% implied probability reflects either extremely lopsided market positioning or a technical artefact; MLB games between major-league opponents rarely show such certainty in genuine prediction markets, suggesting either minimal liquidity, a data lag, or settlement mechanics that have already resolved the outcome in traders' minds.

Historical context matters here. Regular-season MLB matchups between evenly-resourced franchises typically trade in the 45–55% range depending on pitching matchups, recent form, and home-field advantage. The Orioles held a competitive 2024 season, whilst the Mariners have maintained playoff contention. A 100% reading on either side would be unprecedented for a game between non-trivial opponents and warrants scepticism about whether the market reflects genuine expectation or simply reflects thin order books where a single large position has moved the display price to an extreme.

Traders should monitor pitching assignments in the 48 hours before the game; starting pitcher announcements often trigger repricing in baseball markets. Injury reports from both rosters, particularly for key position players, typically move lines by 2–3 percentage points. Weather conditions at Camden Yards—wind direction and temperature affect fly-ball outcomes—occasionally shift expectations late. The settlement window's extension to 18 June is standard for weather-related postponements, but the current probability display should be treated as unreliable until closer to game time when more typical market participation emerges.

Methodology

This page reviews Seattle Mariners vs. Baltimore Orioles 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 Prediction Today — 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 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Prediction Today triggers a quick verification flow that finishes in 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.