Houston Astros vs. Detroit Tigers

Platform comparison

Market context

The upcoming MLB game between the Houston Astros and Detroit Tigers, scheduled for June 28 at 1:40PM ET, is the real-world event underpinning this prediction market. On Polymarket, the contract currently prices at 100% YES for the Houston Astros to win, implying absolute certainty in their victory despite the game having already occurred on the calendar date. This on-chain pricing, settled in USDC on the Polygon network via conditional tokens, diverges sharply from traditional sportsbook odds, where the Astros are favoured by -124 on the moneyline but the Tigers hold a 53.3% win probability according to numberFire[1].

Historically, markets pricing at 100% certainty for a single team in MLB often collapse when the game is postponed or when the underlying data source is delayed, as seen in past seasons where weather disruptions invalidated pre-game certainty. Comparable cases show that even when a team is favoured by -1.5 on the run line[2], the 50-50 tie resolution clause for cancellations remains a critical dependency that traders must monitor, especially given the 8.0 combined run total set for this matchup[1].

Traders should watch for official MLB announcements regarding game completion status, as the settlement window ends 2026-07-05T17:40:00Z and any postponement keeps the market open until completion. Recent DraftKings data confirms the Astros as 1.5-run road favourites with -131 moneyline odds, yet the Tigers’ +106 underdog status suggests volatility if the game is delayed[5]. The primary resolution source is the official final statistics recognised by the governing body, so any discrepancy in the box score or play-by-play timeline could trigger a re-evaluation of the 100% pricing[6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Houston Astros vs. Detroit Tigers across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Scam?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.

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.