Houston Astros vs. Detroit Tigers

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Market context

The upcoming MLB contest at Comerica Park on 26 June features the Houston Astros, currently 40-43 and second in the AL West, against the Detroit Tigers, who sit 34-47 and fourth in the AL Central. The market’s 0% probability for an Astros win is starkly unusual given their superior record, yet it mirrors historical anomalies where a team’s recent form or key absences override season-long statistics. In comparable cases, such as the 2023 matchup where a top-tier squad lost three straight due to a starting pitcher’s injury, crowd-implied probabilities collapsed despite the team’s overall strength, suggesting that current sentiment reflects a specific, acute vulnerability rather than a general decline[1][4].

Traders should monitor Spencer Arrighetti’s return to early-season form, as his 1.34 ERA through eight starts could shift the probability if he performs poorly, alongside Keider Montero’s recent seven-inning solid outing for the Tigers[6]. The Tigers are favoured at -118 on the money line, and the over/under is set at 9, indicating expectations of a high-scoring affair[2]. Recent news confirms Houston won the first game of this four-game series 2-1 on Thursday, but the Tigers’ home advantage and Montero’s momentum may be the catalysts driving the current 0% sentiment[2][4]. Watch for any pre-game announcements regarding lineup changes or weather delays, as these dependencies could alter the settlement outcome before the 22:40 UTC window closes[5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Houston Astros vs. Detroit Tigers 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 PolyGram, 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?

PolyGram 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 PolyGram?

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

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.