Cleveland Guardians vs. Houston Astros

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Active sub-markets

Market context

The Guardians and Astros meet in Houston in the deciding game of a three-game series, with the market currently implying almost no chance of a Cleveland win despite Cleveland’s better overall record. ESPN lists the Guardians at 41-36 and first in the AL Central, while Houston is 36-42 and fourth in the AL West, yet the Astros are still a modest favourite in the betting line at around -132 to -135.[2][1] That gap is a reminder that prediction prices in MLB often lean heavily on venue, starting pitching and late lineup information rather than season record alone.[2][1]

For context, a 0% YES price usually reflects either a very strong favourite elsewhere in the book or a market that has already been pushed to an extreme by fresh team news. MLB preview material has highlighted Houston’s top-end offence, with Yordan Álvarez cited as a major run-production driver, while Cleveland’s recent outlook has been shaped by injuries mentioned in pre-game market commentary.[6][4] Traders will want to watch the confirmed starters, any late scratches, and the final batting orders, since those can move a market sharply in the hours before first pitch.[6][4]

The key catalysts are the official line-up cards and any late availability updates, especially if Cleveland is managing an injury-hit roster or Houston gives key regulars a rest in the series finale. Fox Sports’ game page lists the contest as the final game of the set at Daikin Park, which makes travel and bullpen usage from the first two games relevant to how both clubs approach this one.[3] If the game is delayed, the market stays open until completion; if it is cancelled outright or ends tied, settlement is 50-50 under the rules.

Sources: 1 · 2 · 3 · 4 · 5

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

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 Sport Prediction, 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.

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.

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.