Cleveland Guardians vs. Philadelphia Phillies

Platform comparison

Active sub-markets

Market context

On 23 May at 4:05 PM ET, the Cleveland Guardians will face the Philadelphia Phillies in a regular-season Major League Baseball fixture. A prediction market on this match allows traders to buy YES shares (betting on a Guardians victory) or NO shares (betting on a Phillies win). The current crowd-implied probability of 39% for a Guardians win reflects a slight lean towards Philadelphia, though the market remains relatively balanced given typical home-field and roster considerations. The settlement window extends to 30 May at 20:05 UTC to account for any postponements; if the game is cancelled without a rescheduled date or ends in a tie, the market resolves 50-50.

Historical matchups between these franchises provide context for evaluating the probability. The Guardians have emerged as a competitive AL Central side in recent seasons, whilst the Phillies remain a strong NL East contender with a higher payroll. Head-to-head records and recent form matter less in single-game markets than roster health, starting pitcher matchups, and weather conditions at Citizens Bank Park in Philadelphia. The 39% probability suggests traders view the Phillies as slight favourites, likely reflecting their home advantage and recent regular-season performance metrics.

Traders should monitor lineup announcements and injury reports in the days preceding the match, particularly regarding key position players or starting pitchers. Weather forecasts for Philadelphia on 23 May—wind speed and temperature affect ball carry—warrant attention. Any last-minute roster moves or bullpen availability changes could shift the probability meaningfully. Official MLB communications and team announcements remain the primary sources for such developments.

Methodology

This page reviews Cleveland Guardians vs. Philadelphia Phillies across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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.

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.

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.