Houston Astros vs. San Francisco Giants

Platform comparison

Market context

The Houston Astros face the San Francisco Giants on 12 August at 3:45PM ET in a regular-season MLB matchup. Polymarket's conditional token pricing reflects a 98% implied probability favouring the Astros, with settlement contingent on official MLB final statistics. The contract trades on Polygon via USDC, resolving YES for an Astros victory and NO for a Giants win, with provisions for postponement (market remains open) or cancellation/tie (50-50 split).

The current pricing sits well above historical norms for regular-season games between these franchises. Since 2020, the Astros have won 16 of 22 meetings against the Giants, establishing a 73% head-to-head advantage. However, Polymarket's 98% threshold exceeds even the most lopsided regular-season matchups; comparable pricing typically emerges only when one team faces a severely depleted roster or plays a minor-league affiliate. The Giants' recent form and roster composition would need to be substantially compromised to justify such extreme skew.

Traders should monitor roster announcements through to settlement, particularly regarding starting pitchers and injury updates released 24 hours pre-game. The Giants' bullpen depth and any late-inning personnel changes carry outsized weight given the probability's sensitivity. Weather conditions at the venue and any schedule disruptions affecting either team's preparation warrant attention. Recent reporting from MLB.com and team injury reports through 11 August will clarify whether unexpected absences or roster moves have emerged since market inception, potentially explaining the extreme probability or signalling mispricing.

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 Polymarket Alternative UK, which mirrors the Polymarket order book directly.

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.

UK Frequently Asked Questions

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.