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, at Daikin Park, with Jeremy Peña hitting a grand slam and Yordan Alvarez scoring two home runs to snap a four-game losing streak for Houston [1][3]. Since the contest has already concluded, the prediction market titled “Miami Marlins vs. Houston Astros” must resolve to “Houston Astros”, rendering the current 0% YES crowd-implied probability for a Marlins win factually aligned with the outcome.

In similar on-chain sports markets, once a game finishes, Polymarket’s conditional tokens settle immediately based on the official MLB final statistics, with USDC payouts processed automatically on Polygon [1]. Historical cases show that markets with 0% probability for the losing side often remain liquid until the resolution source confirms the result, but once the governing body publishes the final score, trading halts and positions are locked—exactly what applies here given the Astros’ confirmed victory [1][3].

Traders should monitor the official MLB final statistics page for any post-game adjustments, though no such changes are expected after an 8–5 result [1]. The key dependency is the settlement window ending 2026-07-28, which allows time for official confirmation, but since the game is complete, the resolution is effectively certain [1]. No further announcements or schedule dependencies apply, as the event has passed and the outcome is documented across major sports outlets [1][2][3].

Sources: 1 · 2 · 3 · 4 · 5

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 Scam?, which mirrors the Polymarket order book at 0% fees.

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

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.

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 Polymarket Scam? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.