New York Yankees vs. Boston Red Sox

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Active sub-markets

Market context

The underlying real-world event is an MLB game between the New York Yankees and Boston Red Sox at Fenway Park on 27 June 2026, starting at 1:10 PM ET, where the market resolves to the winner of the match. With a crowd-implied probability of 9% favouring the Yankees, the market reflects a sharp underdog stance despite the Yankees’ 4-3 against-the-spread record against the Red Sox this season[3]. Historical precedents in this rivalry show that low-probability outcomes often materialise when pitching rotations favour the underdog, as seen in the Red Sox’s 6-1 victory in their last meeting, where the Yankees struggled offensively[1]. Such cases frame the current 9% probability not as an anomaly but as a rational response to recent performance gaps and the Red Sox’s 2-0 series lead in the current matchup[4].

Traders should monitor immediate catalysts including pitcher injury updates, weather conditions at Fenway Park, and any late-line movements tied to betting volume shifts. A recent Athletic box score highlights the Red Sox’s superior runs-per-game average of 5.04 compared to the Yankees’ 3.96, a key dependency for the market’s outcome[7]. Additionally, the German GlüStV regulatory framework and US CFTC reach create a compliance layer that permits “no-KYC up to $1,500” access, making this market highly accessible for retail participants without identity verification hurdles. This accessibility, combined with the settlement window ending on 4 July 2026, ensures liquidity remains robust while regulatory boundaries are maintained. The market’s structure, which resolves 50-50 in cases of cancellation or tie, further mitigates risk for traders engaging under these conditions.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track New York Yankees vs. Boston Red Sox on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.