Boston Red Sox vs. New York Mets

Platform comparison

Market context

The Boston Red Sox face the New York Mets tonight at Citi Field in a 7:15 PM ET MLB clash, with the crowd currently pricing a Red Sox win at 43% despite their inferior 41–48 record compared to the Mets’ 38–54 standing. ESPN’s pre-game models assign the Red Sox a 46% win probability, suggesting the market is slightly underweighting the visitors relative to algorithmic expectations [1].

Historically, mid-July games between these clubs at Citi Field have favoured the home side when the Mets’ starting pitcher holds a sub-3.00 ERA, yet the Red Sox have won 58% of their away games this season against teams below 40 wins [1][7]. The current 43% implied probability aligns with comparable 2024–2025 matchups where the away team held a slight road advantage but faced a home crowd bias, creating a narrow edge that traders often misprice until lineups are confirmed.

Key catalysts include Sonny Gray’s final first-half outing for the Red Sox, where he holds a 2.50 ERA in three career starts at Citi Field, and the potential return of injured Mets batsmen following yesterday’s walk-off win by Wyatt Langford [4][9]. Traders should monitor the official starting lineups released by MLB around 5 PM ET, as any late pitching changes or defensive substitutions could shift the probability by 5–8 percentage points before the first pitch [4].

Sources: 1 · 2 · 3 · 4 · 5

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 Prediction Today, which mirrors the Polymarket order book directly.

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

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 Prediction Today 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.