Cleveland Guardians vs. Houston Astros

Platform comparison

Active sub-markets

Market context

The Cleveland Guardians played the Houston Astros on 20 June, and the contract settles on the winner of that game, with a 50-50 fallback only if it is cancelled outright or ends as a tie. The crowd-implied **3% YES** price is far below the market-implied edge seen in the sportsbook data, where Houston is the clear favourite: Pinnacle listed the Astros at **-120** and Cleveland at **+111**, while other books were in the same range[3]. That implies Houston was priced as roughly a 54%-55% chance in the betting market, leaving this contract materially cheaper than the consensus on the game itself[3].

That gap is easiest to read against comparable market signals. Action Network’s preview showed Houston opening around **-162** and Cleveland around **+136**, with public betting heavily tilted to Cleveland on the spread but the moneyline still favouring Houston[2]. Covers also had Houston favoured on the run line, reinforcing that the underlying game view was not a coin flip[1]. A 3% prediction-market quote therefore looks more like an extreme tail-price than a balanced read, and it would normally require either a late lineup shock, a major pitching change, or a weather-related wrinkle to justify such a low YES probability versus sportsbook consensus[1][2][3].

For traders, the main catalysts are the announced starters, any late scratches, and whether the game is completed on schedule, since postponement keeps the market open until a result is official. The market’s settlement rules also matter if weather or scheduling disruption forces a make-up date, because that would defer resolution rather than void it. Recent preview material pointed to Houston as the side analysts leaned towards, so any late move against that view would most likely come from a rotation change or confirmed absence rather than from broad consensus shifting on the teams themselves[4].

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

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 Best Prediction Markets 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?

Best Prediction Markets 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, Best Prediction Markets UK triggers a quick verification flow that finishes in minutes.