Baltimore Orioles vs. Tampa Bay Rays

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Active sub-markets

Market context

Polymarket is pricing Baltimore to beat Tampa Bay at 100% YES, which leaves no room for disagreement unless the contract is later repriced after a delay or suspension. The event itself is the Orioles-Rays game scheduled for 20 May at 1:10pm ET, and the market will settle on the official final result once the game is completed, with any cancellation or tie handled as 50-50 under the rules. For users holding the USDC position on Polygon, the practical point is simple: at this price, the token already reflects near-certainty of an Orioles win, so even routine in-game volatility is largely irrelevant unless the fixture is altered.

The historical context does not support treating Baltimore as inevitable. Tampa Bay had just beaten Baltimore 4-1 on 19 May, with Yandy Díaz and the Rays’ pitching staff doing enough to control the game, and CBS Sports’ box score showed the Rays moving to 32-15 while the Orioles fell to 21-28. ESPN’s standings snapshot on 20 May also had Tampa Bay top of the AL East, with Baltimore well back and below .500 away from home. Head-to-head data from AiScore points to Tampa Bay having the longer-term edge as well, with 165 wins to Baltimore’s 132 across their meetings since 2002. A 100% YES price, therefore, looks more like a market lock than a balanced read on the teams’ current form.

The main catalysts to watch are the game being played as scheduled, any late pitching change, and whether weather or logistics create a postponement rather than a completed result. MLB.com’s standings pages were updated on 20 May, and those official team pages, together with the league’s final game log, are the relevant sources if the match is interrupted or rescheduled. For a contract settled through conditional tokens, the tradeable question is not just who is better on paper, but whether the game reaches an official finish before the market’s resolution window closes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Baltimore Orioles vs. Tampa Bay Rays on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

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'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 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.