Tampa Bay Rays vs. Boston Red Sox

Platform comparison

Active sub-markets

Market context

The Tampa Bay Rays face the Boston Red Sox on 9 May at 4:10 PM ET in a regular-season MLB matchup. Settlement occurs after the final out, with the market remaining open through 16 May should postponement occur. The 51% implied probability for a Rays victory reflects near-even odds, typical for matchups between competitive division rivals where neither team holds decisive advantage.

Historical performance between these franchises shows relatively balanced outcomes over recent seasons, though contextual factors—home-field advantage, recent form, and pitching matchups—drive meaningful variance around baseline expectations. When markets price such contests near 50-50, they typically indicate genuine uncertainty rather than mispricing; traders evaluating this via algorithmic approaches should note that small shifts in probability often correlate with roster announcements or injury updates rather than pre-game sentiment drift.

Key catalysts include confirmed starting pitcher assignments, which materially affect win probability models, and any last-minute roster changes announced within 24 hours of first pitch. Traders using conditional orders or bot-based strategies should monitor official MLB injury reports and team announcements through 8 May, as these frequently trigger repricing. The afternoon start time may also affect liquidity patterns compared to evening games, influencing execution quality for larger position sizes. Weather conditions at the venue warrant checking, as wind direction and temperature can favour hitters or specific pitching profiles.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

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.

Is this market available outside the US?

PolyGram 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.

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.

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.