Cleveland Guardians vs. Houston Astros

Platform comparison

Active sub-markets

Market context

Polymarket’s contract is pricing a **16%** chance of a Cleveland win, so the market is still heavily tilted towards Houston even though the event is a single-game binary outcome settled on the final official result, not on run line or series performance.[6] For a user holding USDC on Polygon, that means the contract’s value is tied to the next completed game state: if Cleveland wins, the token resolves to YES; if Houston wins, it resolves to NO; and a postponement keeps the market open until the game is played.[6]

That kind of price sits well below the pre-game moneyline range that was circulating in mainstream odds coverage, where Houston was generally favoured and Cleveland was the underdog.[2][3][4] In practical terms, a 16% market implies a low but non-trivial upset chance, which is consistent with baseball’s high-variance, one-off nature: even modest underdogs can cash on a good starting pitching night, a late bullpen shift, or a few high-leverage batted balls. Recent boxscore and preview listings also show this was part of a June series in Houston, which matters because venue and starting pitchers are often the main drivers of day-to-day price movement.[1][2][4]

For a Polymarket trader, the main catalysts are lineup confirmation, any last-minute pitching change, and the game’s actual completion status, since postponement or cancellation changes the resolution path more than the team names do.[6] If the scheduled first pitch or weather-sensitive logistics move, the contract can remain open until a make-up game is completed, while an outright cancellation with no make-up, or a tie, settles 50-50 under the market rules.[6] Like any on-chain prediction market, execution happens through conditional tokens rather than a traditional bookmaker ledger, so settlement depends on the official MLB final rather than a media recap.[6]

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

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 Kalshi 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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK triggers a quick verification flow that finishes in minutes.