Philadelphia Phillies vs. Boston Red Sox

Platform comparison

Market context

The Philadelphia Phillies host the Boston Red Sox on 13 May at 6:45 PM ET in a regular-season MLB matchup. Polymarket currently prices a Phillies victory at 6% YES, implying roughly 94% probability for a Red Sox win when accounting for tie/cancellation risk. This represents an extreme skew toward Boston, with conditional tokens on Polygon settling via USDC at these odds.

The 6% probability for Philadelphia reflects either substantial pre-game information favouring Boston or significant liquidity imbalance on the market. Comparable MLB games between evenly-matched teams typically trade in the 45–55% range; such extreme pricing usually emerges when one team carries decisive advantages—injury status of key pitchers, recent form, or head-to-head records. The Phillies' 2024 season trajectory and roster composition relative to Boston's would need to show marked weakness to justify single-digit odds in a home game.

Traders should monitor starting pitcher announcements, which typically arrive 24–48 hours before game time and materially shift conditional token valuations. Recent injury reports for both rosters, particularly among position players and relief pitchers, can trigger repricing. Weather conditions at Citizens Bank Park on game day—wind direction and temperature affecting fly-ball distance—occasionally influence market movement. The settlement window closes 20 May at 22:45 UTC, allowing for postponement resolution if weather forces a delay, though the market remains open until the game concludes.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Resolution source: This market settles from the official publication at https://www.mlb.com/. A proposer submits the result to the UMA Optimistic Oracle on Polygon, the two-hour challenge window opens, and the smart contract pays out in USDC.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.

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.