Houston Astros vs. Detroit Tigers

Platform comparison

Market context

On Sunday, 28 June 2026, the Houston Astros face the Detroit Tigers in a midday MLB clash at Comerica Park, with the Astros needing a win to secure the market outcome. The crowd-implied probability sits at 100% YES for the Astros, yet consensus models like numberFire actually favour the Tigers at 53.3%, creating a stark divergence between public sentiment and analytical value[1]. Historically, such 100% implied probabilities in MLB often signal a mispriced favourite when the underdog holds a superior home record; the Tigers are 23-20 at home while the Astros sit at 21-23 away, a comparable scenario where contrarian angles previously exposed value in the underdog[2].

The primary catalyst for traders is the pitching lineup confirmation, as the Astros are 15-11 to the over as favourites, suggesting a high-scoring game that could swing the result if the Tigers' home bullpen falters[3]. Recent DraftKings analysis notes the Astros enter as 1.5-run road favourites with -131 moneyline odds, implying the market expects a multi-run victory despite the Tigers' strong home form[5]. Value likely sits with the Tigers if the Astros' pitching rotation shows fatigue, a dependency highlighted by the 8-run total set for the game, which pressures both teams to score heavily[1]. Traders should monitor the final starting pitcher announcement, as a late change could invalidate the 100% consensus and open contrarian spots in the Tigers.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Houston Astros vs. Detroit Tigers across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

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

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.