Seattle Mariners vs. Baltimore Orioles

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Active sub-markets

Market context

The Seattle Mariners travel to Baltimore for a regular-season matchup against the Orioles on 11 June at 7:05 PM ET. This single-game binary resolves based on official MLB final statistics, with a settlement window extending to 18 June to accommodate any postponements. The 100% implied probability for YES reflects either exceptional confidence in one team's superiority or insufficient liquidity depth in the order book—a common pattern in niche sports markets where volume concentrates around major fixtures.

Historical precedent suggests caution when evaluating lopsided probabilities in regular-season baseball. The Mariners and Orioles occupy different competitive tiers most seasons, yet single-game outcomes remain volatile; since 2020, neither franchise has maintained a winning record against the other consistently enough to justify extreme confidence. Comparable markets on mid-tier matchups typically see probability distributions flatten once traders with directional conviction enter, particularly when one team carries injury concerns or recent form shifts.

For programmatic traders, the key dependency is roster confirmation closer to game time. Monitor official MLB injury reports and pre-game announcements for starting pitcher changes, which materially alter expected run production. The Orioles' bullpen depth and the Mariners' recent offensive trends warrant tracking through sports-data feeds. Conditional order logic should account for the postponement clause—if the game shifts to 12 June, settlement timing changes, affecting carry costs for leveraged positions. The 50-50 tie resolution is theoretically possible but historically rare in MLB, making it a negligible edge case for most algorithmic approaches.

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 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.