San Francisco Giants vs. Colorado Rockies

Platform comparison

Active sub-markets

Market context

The San Francisco Giants travel to Colorado on 31 May for a regular-season matchup against the Rockies, with first pitch at 3:10 PM Eastern Time. Polymarket currently prices Giants victory at 98% YES, reflecting substantial confidence in San Francisco's chances. On-chain, this conditional token pair settles against USDC on Polygon once the game concludes, with the resolution source tied to official MLB statistics. The settlement window extends to 7 June, allowing for any weather-related postponements that might delay the fixture.

The 98% probability sits well above typical pre-game odds for regular-season baseball, where even strong favourites rarely command such extreme pricing. Historical context matters here: regular-season games between non-playoff contenders often see tighter markets, yet this contract's extreme skew suggests either significant roster disparities or recent form divergence between the clubs. Giants-Rockies matchups have historically favoured San Francisco in head-to-head records, though Colorado's home-field advantage at Coors Field traditionally inflates run-scoring environments.

Traders should monitor starting pitcher announcements, which typically arrive 24–48 hours before game time and materially shift conditional token valuations. Injury reports released through official MLB channels or team media could shift the probability, particularly if either side's key position players or relief arms become unavailable. Weather forecasts for Denver merit attention given Coors Field's elevation and May weather volatility. Any postponement triggers the market's extension clause, keeping positions open until completion rather than resolving early.

Methodology

We track San Francisco Giants vs. Colorado Rockies on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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?

On Kalshi UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Kalshi UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 it cost to trade on Kalshi UK?

Zero. Kalshi UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.