Arizona Diamondbacks vs. San Francisco Giants

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Active sub-markets

Market context

The Arizona Diamondbacks face the San Francisco Giants on 27 May at 3:45 PM ET in a regular-season matchup. The market currently prices the Diamondbacks at 52% implied probability, reflecting modest favouritism in what remains a competitive divisional contest within the National League West.

Historical matchup data between these franchises shows relatively balanced outcomes over recent seasons, with neither team establishing decisive home-field dominance. The Giants' performance in May typically reflects their early-season form, whilst the Diamondbacks' record in late spring contests has varied considerably depending on roster health and pitching availability. Traders evaluating comparable May matchups from 2023–2024 seasons will note that crowd-implied probabilities in the 50–55% range for divisional games often shift materially once starting pitcher confirmations arrive, particularly if either team announces roster changes or injury updates within 48 hours of first pitch.

Key variables affecting settlement include confirmed starting pitcher assignments—typically announced 24–48 hours before game time—and any weather-related delays at the venue. The Giants' recent bullpen performance and the Diamondbacks' offensive consistency against left-handed pitching represent material catalysts. Traders using conditional order logic should monitor official MLB injury reports and team announcements through 26 May, as roster moves or unexpected absences can shift implied probabilities by 3–5 percentage points. The settlement window extends to 3 June, accommodating potential postponements, though same-day rescheduling remains standard practice for regular-season games.

Methodology

We track Arizona Diamondbacks vs. San Francisco Giants 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 Polymarket Bot 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?

Polymarket Bot 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.

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 does it cost to trade on Polymarket Bot UK?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Bot UK triggers a quick verification flow that finishes in minutes.