Miami Marlins vs. Houston Astros

Platform comparison

Market context

The Miami Marlins and Houston Astros faced each other in a Major League Baseball game at Daikin Park on 20 July 2026, with the Astros winning 8–5 to snap a four-game losing streak [6][15]. In prediction markets, a YES share pays out if the selected outcome occurs (here, the Astros winning), while a NO share pays out if it does not; the current 0% YES probability for the Marlins implies the crowd views a Marlins victory as effectively impossible given the final result.

Historically, when a team wins a game decisively after being the betting favourite, prediction markets that resolve on the winner quickly collapse to 0% for the underdog once the outcome is confirmed. The Astros held the moneyline favourite role throughout the betting window, with odds tightening from –131 to –131, and models projected a 6–4 Astros win [2][5]. This aligns with the broader trend that the Astros have won seven of their last eight games against the Marlins, reinforcing why the market priced the Marlins at near-zero chance post-game [12].

Traders should monitor official MLB final statistics as the primary resolution source, noting that postponed games keep markets open until completion, while cancellations or ties resolve 50–50 [1]. Key catalysts include starting pitcher confirmations (Janson Junk for Miami, Ronel Blanco for Houston) and any injury updates affecting lineups, as Blanco’s return from Tommy John surgery introduced uncertainty that influenced the run total moving from 8.5 to 9 [2][5]. With the game already played and the result confirmed, no further catalysts will alter the settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Market UK, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Market UK. 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'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 Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.