Miami Marlins vs. Houston Astros

Platform comparison

Market context

The Houston Astros defeated the Miami Marlins 8–5 in their MLB game on Monday, 20 July 2026, with Jeremy Peña hitting a grand slam and Yordan Alvarez scoring two home runs to end a four-game losing streak for Houston [1]. Since the match has already concluded with a clear Astros victory, the prediction market resolving to “Miami Marlins” is correctly priced at 0% YES, reflecting the factual outcome rather than a speculative probability.

Historically, MLB markets that remain open post-game completion due to technical delays in settlement typically correct to 0% or 100% within hours once official stats are confirmed by MLB’s governing body. Comparable cases from the 2024 and 2025 seasons show that when a game ends decisively—such as an 8–5 win with no tie or cancellation—the crowd-implied probability for the losing side collapses immediately, mirroring the current 0% reading for the Marlins [1].

Traders monitoring this market should watch for any official MLB announcements regarding game validity, though no postponement or cancellation has been reported. The primary dependency is the finalisation of the official statistics on ESPN and MLB.com, which already confirm the Astros’ win [1]. For programmatic approaches, conditional orders or copy-trading bots can safely execute a “sell YES” or “buy NO” strategy, as the resolution source is unambiguous and the event is complete.

Sources: 1

Methodology

This page reviews Miami Marlins vs. Houston Astros 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 Polymarket Bot UK, 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

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 Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Polymarket Bot UK 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.