Cleveland Guardians vs. Philadelphia Phillies

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Market context

The Cleveland Guardians visit the Philadelphia Phillies in a regular-season MLB game, and this market pays out on the outright winner. In prediction-market terms, a YES share here means the Guardians win; a NO share means the Phillies win. The crowd-implied price of 39% on Cleveland suggests the market sees Philadelphia as the more likely winner, but not overwhelmingly so, which is consistent with a fairly live away side rather than a mismatch.

Recent context points to a competitive series history. ESPN’s game page lists Cleveland at 30-22 and Philadelphia at 25-25 heading into the matchup, with the Guardians stronger both overall and on the road. The clubs also split attention in recent meetings: MLB.com reported the Guardians were shut out 3-0 by the Phillies in a 2025 series rubber match, while other head-to-head summaries show Philadelphia holding a narrow edge across the longer run. That sort of mixed record is useful in prediction markets because it explains why prices can sit below 50% even when the underdog has the better recent season line.

For traders, the main catalysts are line-ups, starting pitchers, and any late schedule changes, since the market stays open if the game is postponed and only closes after the game is completed. The official final score is the primary resolution source, so verified MLB game status matters more than pre-game commentary. A recent ESPN listing has the game at Citizens Bank Park on 24 May, with Philadelphia given the stronger implied win probability, so any late team news that shifts the pitching matchup or rest status could move the market quickly.

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.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.