Cleveland Guardians vs. Philadelphia Phillies

Platform comparison

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. The 68% implied probability favouring Cleveland reflects the Guardians' stronger recent form and pitching depth heading into late May. Across major prediction platforms, this probability translates differently: Polymarket displays it as a decimal of approximately 3.13 for a Phillies win, whilst Kalshi's binary structure presents the inverse directly. Betfair and Smarkets typically show fractional odds around 15/8 for Philadelphia, though their fee structures—ranging from 2% commission on Betfair to variable maker/taker models on Smarkets—affect the effective odds traders encounter. KYC requirements vary substantially; Polymarket operates with lighter verification for many jurisdictions, whilst Kalshi enforces stricter US-based identity checks.

The Guardians finished 2024 with a 92-win season and have maintained competitive depth in their rotation. Philadelphia, despite winning the National League East in recent seasons, entered May with inconsistent offensive production. Historical matchups between these clubs show Cleveland has won at a 52% clip over the past three seasons, supporting the current market lean. Traders should monitor starting pitcher announcements—typically confirmed 48 hours before game time—as rotation health directly impacts win probability. Weather conditions at Citizens Bank Park, particularly wind direction affecting fly-ball distances, have historically influenced totals but less so moneyline outcomes. Any late roster moves or injury updates to key position players would shift the probability noticeably, though such announcements remain unlikely this close to game time.

Methodology

This page compares Cleveland Guardians vs. Philadelphia Phillies specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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.

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.