Tampa Bay Rays vs. Boston Red Sox

Platform comparison

Active sub-markets

Market context

On 9 May at 4:10 PM ET, the Tampa Bay Rays will face the Boston Red Sox in a regular-season Major League Baseball fixture. In prediction markets, a YES share represents a bet on the Rays winning; a NO share bets on a Red Sox victory. The current crowd-implied probability of 52% YES suggests modest confidence in a Rays win, with the market pricing the outcome as marginally favourable to Tampa Bay but genuinely competitive. The settlement window extends to 16 May to accommodate any postponement, with cancellations or ties resolving at 50–50 odds.

Historical matchups between these franchises provide context for interpreting the current probability. Over the past five seasons, the Rays have held a slight edge in head-to-head records, though both teams have experienced significant roster turnover. The Red Sox, despite recent rebuilding phases, retain institutional strength in the AL East, whilst the Rays have cultivated a reputation for competitive efficiency despite lower payroll constraints. A 52% lean toward Tampa Bay reflects neither dominance nor underdog positioning—it suggests traders view the teams as closely matched on the day.

Traders should monitor pitching assignments and injury reports before game time. Starting pitcher availability often shifts market probabilities materially, particularly if either team's ace is unavailable. Recent weather forecasts for the game location and any late roster announcements from either franchise could trigger repricing. Additionally, momentum from recent performances—win streaks or slumps in the days preceding 9 May—typically influences late trading activity as new information reaches the market.

Methodology

We track Tampa Bay Rays 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

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?

Prediction Market UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

What does it cost to trade on Prediction Market UK?

Zero. Prediction Market UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

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