San Francisco Giants vs. Arizona Diamondbacks

Platform comparison

Active sub-markets

Market context

The San Francisco Giants meet the Arizona Diamondbacks in MLB action on 20 May, with the market set to resolve on the official final result. The crowd price near 50% implies a near pick’em, and recent form gives that reading some support: Arizona opened the series with a 12-2 win on 18 May, while ESPN noted Ketel Marte’s late three-run homer in a 5-3 Diamondbacks win over the Giants. MLB’s game preview also points to a split edge in the pitching matchup, highlighting Justin Verlander’s 0.69 ERA over two starts this month, but also Brandon Pfaadt’s poor track record against San Francisco, at 0-4 with a 5.11 ERA in five starts.

For market framing, historical head-to-head results suggest a mild Giants edge over the longer run, but the last 20 meetings are close enough to keep this volatile. StatMuse puts San Francisco at 9-11 in the last 20 against Arizona, which is consistent with a game that can move sharply on one starter, bullpen usage, or a single big inning. For traders, the main catalysts are line-up confirmation, any late pitching change, and the day-of-game status of the series schedule, as a postponement would keep the market open until completion. If the game were ever cancelled without a make-up, or ended in a tie, the market would settle 50-50.

On access and regulation, these markets sit in a cross-border grey zone: German GlüStV rules can affect whether participation is treated as gambling for users in Germany, while the US CFTC can reach activity that looks like a derivatives or event-contract market. A “no-KYC up to $1,500” threshold means smaller accounts may be able to deposit and trade without full identity checks, but it does not remove local compliance restrictions or tax reporting obligations.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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?

On PolyGram, 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?

PolyGram 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'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 PolyGram?

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