Cleveland Guardians vs. Philadelphia Phillies

Platform comparison

Active sub-markets

Market context

Cleveland visit Philadelphia on 22 May, with the market currently pricing the Guardians at about 39% despite them arriving with a better overall record. Cleveland are 30-22 and 15-12 away, while the Phillies are 25-25 and 13-14 at home, so the crowd price leans towards a home-side response rather than season-long form. Recent head-to-head results are mixed: the teams have split the last few meetings, but Cleveland won 6-0 in Philadelphia in May 2025, and the last three games between them have produced a low-scoring, fairly even run profile rather than a clear edge for either club.

The main trader watch-points are the line-up cards, the starting pitchers, and any late injury news, particularly given how much the market can move if one club rests regulars or gets a confirmed bullpen downgrade. ESPN lists the game for 24 May at Citizens Bank Park and shows the Phillies as a modest home favourite in the matchup preview, which is consistent with the market giving Philadelphia the edge but not pricing a dominant spot. Guardians-phillies discussion on the betting and preview channels has also centred on first-five angles rather than full-game certainty, suggesting traders are treating the starting pitching matchup as the key dependency rather than either offence carrying a strong recent case.

Sources: 1 · 2 · 3 · 4 · 5

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.