Cleveland Guardians vs. Philadelphia Phillies

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Active sub-markets

Market context

The Guardians travel to Citizens Bank Park on 24 May for an afternoon matchup against the Phillies, with the current 55% implied probability favouring Cleveland. Recent form has shifted the market's centre of gravity: the Guardians have won six of their last eight games, whilst Philadelphia's record over the same stretch sits at 4–4, with particular struggles against division rivals. The afternoon start time at 1:35 PM ET may suppress Philadelphia's home-field advantage, as the Phillies have historically performed better in evening fixtures where their bullpen depth becomes more relevant.

Historical head-to-head records between these franchises offer limited predictive power for individual games, but the Guardians' pitching depth—particularly their starter's ERA differential—has been the primary driver of market movement over the past 48 hours. Philadelphia's recent injury updates warrant close monitoring; the Phillies' outfield composition has shifted twice in May, affecting their offensive consistency. Any lineup announcements before first pitch could trigger repricing, especially if either team's designated hitter status changes.

Weather conditions at Philadelphia on 24 May typically favour fly-ball pitchers, a factor that benefits Cleveland's rotation style. The settlement window extends to 31 May, allowing for postponement resolution should rain interrupt the scheduled fixture. Traders should track overnight pitching confirmations and any late roster moves, as bullpen availability often determines close games in May when teams are still establishing their rotation patterns.

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

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.

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.

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.