St. Louis Cardinals vs. Kansas City Royals

Platform comparison

Active sub-markets

Market context

The Cardinals and Royals are into the second game of their June series, with the matchup at Kauffman Stadium scheduled for 8:15pm ET and carried nationally on Apple TV; ESPN listed St. Louis at 40-33 before first pitch, while Kansas City came in at 31-45. [4][2] The market’s 11% yes price is low relative to that baseline, implying a sizeable Royals lean already baked into the crowd view rather than a coin-flip read on the teams. [2]

That framing matters because this is not a fresh one-off: the clubs already met on 18 June, and MLB’s game listing shows the series context and venue as the same Kansas City setting. [7][4] In comparable division games, short-price favourites can still draw modest support when the away club is stronger on record, but the underdog side is usually only priced near double digits when either the starting pitching, travel spot, or lineup news looks unfavourable to the market’s favourite. [2][4]

For traders, the key catalysts are the confirmed line-ups, any late pitching change, and whether the game stays on the original schedule, since the market remains open if postponed and only resolves 50-50 if it is cancelled or tied. [4] With the event window running to 27 June, the practical risk is less about the settlement clock than any official MLB adjustments around the start time, weather, or a make-up date announcement. [4][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews St. Louis Cardinals vs. Kansas City Royals 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 Prediction Today — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Prediction Today, 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?

Prediction Today 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.

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.