Cleveland Guardians vs. Philadelphia Phillies

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Active sub-markets

Market context

The Cleveland Guardians travel to Philadelphia on 23 May for an afternoon fixture against the Phillies, with Polymarket currently pricing a Guardians victory at 39% on USDC via Polygon's conditional token infrastructure. This represents a seven-point underdog position for Cleveland, reflecting Philadelphia's stronger regular-season record and home-field advantage at Citizens Bank Park.

Historical matchups between these franchises show the Phillies have maintained a slight edge over recent seasons, though Cleveland's 2023 World Series appearance demonstrated their capacity to compete against elite competition. The current probability aligns with typical home-team pricing adjustments in MLB markets, where venue advantage typically commands a 3–5 percentage-point premium. Comparable May fixtures from prior years suggest afternoon games favour teams with established offensive consistency, a category where Philadelphia's recent lineup construction gives them measurable advantage.

Traders should monitor starting pitcher assignments, as rotation depth significantly influences conditional token pricing in baseball markets. Weather conditions at game time—particularly wind direction affecting fly-ball distances—historically shift probabilities by 2–3 points in afternoon games. Recent injury reports from both rosters, particularly any late-season absences from key batters, warrant tracking through official MLB communications before settlement on 30 May. The settlement window extends seven days beyond the scheduled fixture to accommodate potential postponements, a common mechanism on Polymarket for weather-affected sports contracts.

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 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.

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.