Kansas City Royals vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

Polymarket is pricing this Royals-Cardinals contract at 100% YES, so the conditional tokens are effectively all pointed at a Kansas City win and the USDC exposure is entirely on that side. The game is scheduled for 2:15pm ET on 16 May, and the market only resolves once the official final score is known. For a trader, that leaves almost no disagreement in price and little room for probabilistic nuance unless the event itself is delayed, suspended or otherwise altered before completion.

The main read-through from comparable market cases is that a 100% price on Polymarket usually reflects a near-certain settlement expectation rather than a judgement that the result is literally guaranteed. In baseball, late changes still matter: a postponed or suspended game stays open until completed, and a cancelled game or tie would push resolution to 50-50 under the contract terms. Recent coverage on ESPN and MLB.com indicates the teams are already in the day’s live game cycle, so the practical catalyst is any official delay, lineup change or weather-driven interruption rather than pre-match sentiment. The Cardinals’ official scoreboard also shows the fixture as active, which is the key dependency for how the token settles.

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Methodology

This page reviews Kansas City Royals vs. St. Louis Cardinals across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

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.

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.

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.