Cleveland Guardians vs. Houston Astros

Platform comparison

Active sub-markets

Market context

The Cleveland Guardians’ visit to Houston on 19 June came into the market as a lopsided spot, with the crowd leaning heavily to **Houston** at 97% YES. That sort of price is consistent with the pre-game setup in the available previews: Houston entered with a better record and the Guardians had just been hit by the loss of José Ramírez and rookie Chase DeLauter to injury, which left Cleveland looking thinner in the middle of the order[1][5]. The recent head-to-head also matters, because Houston had already beaten Cleveland 2-0 in their previous meeting on 22 April, a result that reinforces the idea that this matchup has favoured the Astros recently[1].

For traders, the key catalysts are still team-sheet and pitching updates rather than broader market noise. MLB’s game preview highlighted Tanner Bibee’s strong recent stretch, noting 15 innings, 11 strike-outs and only two earned runs across his previous two starts, while also flagging rookie Tatsuya Imai as a rebound candidate after a rough outing[4]. That creates a clear dependency on late confirmation of the starters and any last-minute changes to Cleveland’s injury situation, because an unchanged Houston line-up against a depleted Guardians offence would support the current market bias[1][4]. If the game were postponed, the market stays open until completion; if it were cancelled or tied, it would settle 50-50.

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

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, Sport Prediction 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.