Philadelphia Phillies vs. Boston Red Sox

Platform comparison

Market context

The Philadelphia Phillies travel to Boston on 14 May for an evening matchup against the Red Sox, with first pitch at 6:45 PM ET. Polymarket currently prices a Phillies victory at 43% (implied by the YES token), valuing a Red Sox win at 57%. The settlement window extends to 21 May at 22:45 UTC, allowing for potential postponements given the late-spring weather window in New England.

The 43% probability reflects the Red Sox's marginal home-field advantage in May, though recent seasons show the Phillies have performed competitively against Boston. The clubs' head-to-head record and run differential in comparable matchups provide baseline context: the Phillies won the 2022 National League East with stronger offensive metrics than Boston's 2022 campaign, whilst the Red Sox have maintained consistency in their division. Current-season records as of early May will shift this baseline—a Phillies team ahead of pace would justify higher YES token valuations, whilst Red Sox momentum in their division would support the current 57% pricing.

Traders should monitor starting pitcher announcements, typically confirmed 24–48 hours before game time, as individual matchups materially affect run expectancy. Injury reports on both rosters—particularly position players in the Phillies' core lineup and Boston's catching depth—warrant attention. Weather forecasts for Boston on 14 May could trigger postponement, which would reset the market until completion. Recent ESPN and MLB.com updates on roster status and pitching rotations provide the most reliable data for recalibrating conditional token positions on Polygon.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.

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.