San Francisco Giants vs. Boston Red Sox

Platform comparison

Market context

San Francisco Giants–Boston Red Sox is priced at a 14% YES on Polymarket, so the contract is trading as a clear underdog view on a Giants win, with settlement dependent on the final MLB result and the event staying open if the game is postponed. Because the market uses USDC on Polygon and resolves through conditional tokens, the practical question for traders is not the box score alone but whether the scheduled game is completed cleanly within the settlement window ending 28 August at 23:10 UTC.

Comparable reading of a 14% spot usually implies the market is leaning heavily towards Boston, which matched pregame baseball pricing that had the Red Sox around -170 to -189 and the Giants around +155 to +163 at Fenway Park. ESPN’s pregame listing showed Boston 68-59 and San Francisco 52-75, with Logan Webb against Sonny Gray, a pitching matchup that still left the home side favoured despite both teams carrying enough starting quality to keep variance live. The contract’s 50-50 fallback on cancellation or a tie also matters here, although MLB ties are rare and rain delays more often push resolution rather than alter it.

The main catalysts are straightforward: line-up changes, late pitcher scratches, weather, and any rescheduling announcements from MLB or the clubs. Fenway’s Friday night start was set for 7:10 p.m. ET, so traders would typically watch the official game status, weather updates, and confirmed starters close to first pitch, as those are the inputs most likely to move the implied probability before the on-chain outcome is fixed.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track San Francisco Giants vs. Boston Red Sox across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.