Boston Red Sox vs. Kansas City Royals

Platform comparison

Active sub-markets

Market context

The Boston Red Sox and Kansas City Royals are due to play again in this series, with the market currently pricing Boston at 0% YES, which makes the Royals the overwhelming favourite by implication. In handicap terms, that leaves the Red Sox as a pure contrarian angle rather than a consensus play: any Boston case has to lean on recent form, matchup edges, or late line-up changes rather than broad market sentiment. Comparable MLB spots after a one-sided first result can still move quickly if a presumed underdog has already taken control of the series or if the market has overreacted to a single pitching or run-scoring outlier.

Recent coverage suggests Boston has already done the damage in the set, including a 9-5 win at Kauffman Stadium on Monday, when Jarren Duran drove in three runs and the Red Sox moved to 3-1 against the Royals this season, leaving them needing one more win in the final two games to clinch the tiebreaker, according to MLB.com. That matters because traders should watch whether Boston keeps the same offensive core intact and whether Kansas City responds with a stronger pitching assignment or a different late-game bullpen mix. ESPN’s live listing for the May 20 game also indicates the schedule around this matchup is still active, so any postponement, line-up reshuffle, or announced starter change could be the main catalyst for price movement before first pitch.

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Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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

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 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.