Cleveland Guardians vs. Philadelphia Phillies

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Active sub-markets

Market context

The Cleveland Guardians travel to Philadelphia on 24 May for a regular-season matchup against the Phillies, with first pitch at 1:35 PM ET. Polymarket currently prices a Guardians victory at 80%, reflecting substantial confidence in Cleveland's chances. This probability translates to roughly 0.80 USDC per conditional token on the YES side, with the inverse 0.20 USDC available for Phillies backers—a spread that has tightened considerably from earlier in the week as market participants digest recent roster developments and pitching assignments.

Historical context suggests the 80% threshold warrants scrutiny. In May matchups between these franchises over the past three seasons, the Guardians have won approximately 55% of games, yet Polymarket's current pricing implies a significantly higher edge. The Phillies' recent form matters considerably; Philadelphia has posted winning records in May for four consecutive years, whilst Cleveland's May performance has been more volatile. Comparable late-May games involving division rivals have typically settled within 60–70% probability ranges when one team holds a clear pitching advantage, suggesting the current 80% may reflect either exceptional starting-pitcher quality for Cleveland or market overconfidence in a single-game outcome.

Traders should monitor the official pitching announcements, expected within 48 hours of game time. Injury reports from both clubs—particularly any late-inning bullpen availability—will shift conditional token valuations on Polygon. Weather conditions at Citizens Bank Park, where afternoon games frequently encounter wind patterns affecting fly-ball outcomes, represent an underappreciated catalyst. The settlement window extends to 31 May, providing a buffer for postponements, though this also means positions remain locked until completion.

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

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.

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.

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.