Cleveland Guardians vs. Houston Astros

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Market context

Polymarket is pricing **Cleveland Guardians vs Houston Astros** at just **2% YES**, which means the contract is heavily discounting a Cleveland win and sitting close to a near-unanimous Houston lean on the CLOB. On Polymarket, the position is held in **USDC** and settled through **conditional tokens** on Polygon, so the only thing that matters is the official final result from the listed game once it completes.

That low reading is broadly consistent with the wider betting market, where Houston was trading as a clear favourite before first pitch. DraftKings had the Astros around **-143** with Cleveland at **+119**, while other books had Houston in the same range, and preview models on game day also leaned to an Astros win.[1][5][3] In comparable MLB match-ups, a market price near 2% usually implies not just an underdog, but one needing several things to go right at once: a better-than-expected starting pitching performance, clean late-game bullpen work, and no defensive mistakes or scoring surge by the favourite.

For traders, the practical catalysts are straightforward: watch for any **line-up changes**, late **pitching confirmations**, weather-related delays, and whether the game is completed as scheduled, because postponement keeps the market open until a final result exists. If the match were cancelled outright or ended in a tie, the market would resolve **50-50** under the rules, which is the main non-result risk rather than the baseball side itself. The settlement window runs to **2026-06-27T23:15:00Z**, so any official make-up game within that period would still determine the outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Cleveland Guardians vs. Houston Astros 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket 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.

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.

Do I need to KYC for this market?

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