Tampa Bay Rays vs. New York Yankees

Platform comparison

Active sub-markets

Market context

The Tampa Bay Rays travel to face the New York Yankees on 24 May at 1:35 PM ET in a regular-season MLB matchup. The 45% implied probability for a Rays victory reflects their historical underdog status against the Yankees, though the specific matchup context—pitching assignments, recent form, and injury status—will determine whether this pricing holds across platforms. Kalshi's decimal-odds format (roughly 1.82 for a Rays win at current probability) presents the same information as Polymarket's percentage display, though traders accustomed to traditional sportsbook conventions may find Betfair's fractional odds presentation more intuitive for quick mental conversion.

The Yankees have maintained a structural advantage in head-to-head records and payroll disparity, yet the Rays' 2024 season trajectory and bullpen depth warrant close examination. Recent roster moves, particularly any last-minute roster transactions or injury announcements from either club, typically shift these markets 2–4 percentage points within 48 hours of game time. The settlement window extends to 31 May, allowing for postponement resolution, which carries material risk given late-May weather patterns in the Northeast. Traders should monitor official MLB injury reports and weather forecasts through 24 May morning; Smarkets and Betfair historically tighten spreads faster than Polymarket on same-day sports events, reflecting their higher liquidity in established betting markets.

Methodology

This page compares Tampa Bay Rays vs. New York Yankees specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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 PolyGram?

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

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.