Baltimore Orioles vs. Tampa Bay Rays

Platform comparison

Active sub-markets

Market context

Polymarket is pricing this Orioles-Rays contract at 100% YES, so the market is effectively treating a Tampa Bay win as fully reflected in the tokens already outstanding on Polygon. That leaves very little room for a Baltimore upset unless fresh information shifts the book before first pitch. The game is scheduled for 20 May at 1:10pm ET, and the on-chain settlement will follow the official result: the winning side receives the USDC-denominated payout through the conditional tokens, while a postponement keeps the market open until completion. If the game is abandoned entirely or ends tied, the market resolves 50-50.

The pricing sits against a clear recent form gap. Tampa Bay beat Baltimore 16-6 on Monday in St Petersburg, with Yandy Díaz collecting four hits and four RBIs and Junior Caminero driving in four runs; the Rays have also taken a 32-15 record into the matchup, including 18-5 at home, while Baltimore entered at 21-28. Head-to-head history also leans Tampa Bay’s way, with the Rays holding the stronger long-run record in the series, which helps explain why the YES side has been pushed to the ceiling. When a contract is pinned at 100%, the practical question for traders is not the baseline team strength but whether there is any late line-up, pitching, or weather change capable of altering the settlement path.

The main catalysts to watch are line-up confirmations, any late scratch to a starter, and schedule changes linked to weather or field conditions. ESPN’s game page had Tampa Bay listed around -120 for the matchup, which is materially less extreme than the on-chain price and underlines how much of the expected outcome has already been baked in. Because the market remains open until the game is officially completed, a postponement would matter more than a routine pre-match update: it would extend exposure rather than settle the contract early.

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

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

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram 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.