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

This page reviews Philadelphia Phillies vs. Boston Red Sox across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

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

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.

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.

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.