Cleveland Guardians vs. Philadelphia Phillies

Platform comparison

Active sub-markets

Market context

The Cleveland Guardians travel to Philadelphia on 23 May for a regular-season matchup against the Phillies, with first pitch at 4:05 PM ET. The current crowd-implied probability of 38 per cent for a Guardians victory reflects moderate confidence in the home side, though both franchises entered 2024 with competitive rosters and playoff aspirations. Settlement occurs on 30 May at 20:05 UTC, allowing for postponements or make-up games within that window; any cancellation without rescheduling or tied result triggers a 50-50 split.

Historical matchups between these clubs show competitive balance. The Phillies won the 2022 National League pennant and have maintained roster depth, whilst the Guardians reached the 2023 World Series and possess strong starting pitching. Head-to-head records in recent seasons have favoured neither side decisively, making the 38 per cent probability for Cleveland reasonable rather than extreme. Comparable May regular-season games between playoff-contending teams typically settle near 45–55 per cent for the visiting side, suggesting modest home-field advantage is already priced in.

Traders should monitor starting pitcher assignments and injury reports through late May, as rotation decisions often shift probabilities in baseball markets. Weather conditions at Citizens Bank Park—particularly wind direction affecting fly balls—can influence totals and moneyline movement. Deposit flows into prediction markets typically accelerate as event dates approach; withdrawal options via SEPA, Klarna, or USDC settlement affect how much capital remains available for late-market adjustments. Any roster moves or bullpen availability changes announced in the days before 23 May will likely shift book depth and implied odds.

Methodology

We track Cleveland Guardians vs. Philadelphia Phillies 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

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.

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.