Cleveland Guardians vs. Houston Astros

Platform comparison

Active sub-markets

Market context

The Cleveland Guardians are scheduled to play the Houston Astros, and the current crowd-implied probability of **12%** for Cleveland is far lower than the pre-match moneyline picture, where Houston has been priced around **56% to 58%** to win and Cleveland roughly **44%** in the same market. That gap matters because it suggests the contract is trading well below both the sportsbook consensus and the broader market expectation, rather than merely reflecting a modest underdog position.[1][2]

On comparable pricing, the Astros have generally been the shorter side, with one model-driven preview calling Houston’s moneyline fair at about **57.8%** and another bookmaker board showing Houston at **-137** in a match where the total was **8.5**. That backdrop implies the prediction market is asking traders to assign a materially larger upset chance to Cleveland than most cross-platform pricing does, so the key question is whether any late roster or pitching change justifies that discount.[1][2]

For traders, the main catalysts are line-up confirmation, starting-pitcher availability, and any weather or postponement risk before first pitch, because the market stays open if the game is delayed and only settles 50-50 if it is cancelled or tied. Recent previews also highlighted injury and run-scoring context as part of the Astros case, which means any late scratch or rotation adjustment could move both the moneyline and the contract’s implied probability quickly.[1][2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Cleveland Guardians vs. Houston Astros 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 Best Prediction Markets — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Best Prediction Markets, 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?

Best Prediction Markets 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.

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 Best Prediction Markets?

Zero. Best Prediction Markets routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.