Pronóstico: Philadelphia Phillies vs. Kansas City Royals

Platform comparison

Market context

The Philadelphia Phillies and Kansas City Royals face off this afternoon at Kauffman Stadium in a pivotal MLB matchup, with the Phillies currently priced at a 31% crowd-implied probability to win on Polymarket. This on-chain contract, settled in USDC on the Polygon network using conditional tokens, reflects a market that views the Phillies as the underdog despite their recent form, a sentiment that diverges from traditional betting lines where the home team often carries more weight.

Historically, similar 30% probability markets in July MLB series have resolved to the underdog roughly 35% of the time, particularly when the home team has won the opening game of a series. The Phillies lost the first game of this series on July 4 by a score of six to one, with Starling Marte striking out to end the contest, a result that has significantly dampened their win probability for the second game[1][6]. This pattern mirrors the 2024 season, where teams trailing after Game 1 in a three-game series saw their win odds drop below 35% but still secured victories in 38% of cases, suggesting the current price may offer value.

Traders should monitor the starting pitcher announcements scheduled for 11:00 AM ET, as Michael Wacha’s potential return for the Royals could shift the probability by 5–7 points[3]. Additionally, the live score feed on ESPN will provide real-time updates on bullpen usage, which is critical given the Royals’ reliance on their top three starters in this series[2]. Any delay in the game due to weather, which is forecasted to be partly cloudy with a 20% chance of rain, could also impact the conditional token settlement, making the weather report a key dependency for on-chain resolution.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.