Cleveland Guardians vs. Houston Astros

Platform comparison

Active sub-markets

Market context

Polymarket is pricing the **Guardians side at 97% YES** on USDC-settled conditional tokens on Polygon, which implies the market sees Cleveland as a near-certain winner rather than merely a slight favourite. That sort of price usually reflects either a very lopsided late move in the underlying baseball market or thin remaining liquidity after traders have adjusted for confirmed line-up, pitching, and venue information.

The broader betting frame is more modest than the Polymarket price suggests. Recent MLB previews had Houston as a narrow moneyline favourite, with prices around Astros -124 to -142 and Cleveland around +105 to +120, while model-based win probabilities clustered closer to the mid-50s for Houston or even around 64% in one preview for Houston. That makes the 97% contract price look aggressive relative to conventional sportsbook and projection-market benchmarks, so users should treat it as a market-implied view on settlement rather than a clean read on the game itself.

For Polymarket users, the main catalysts are practical rather than abstract: confirmed line-ups, any late pitching changes, weather or scheduling updates, and whether the game is completed without postponement. Because the contract resolves on the official result, a postponement keeps it open until the make-up game is played, while a cancellation or tie would force a 50-50 outcome. On-chain, that means the key risk is not only who wins, but whether the event reaches a standard final MLB result within the settlement window.

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

Where can I trade this market with the lowest fees?

On Polymarket UK, 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?

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 does it cost to trade on Polymarket UK?

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

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.