St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

The St. Louis Cardinals and Cincinnati Reds are due to meet in MLB action on Friday night, and this market will pay out on whichever side wins once the game is official. In prediction markets, a YES share here means the Cardinals win; a NO share means the Reds win. If the game is postponed, the market stays open until the rescheduled game is completed. If it is cancelled outright or ends in a tie, the contract settles 50-50, so the exact result matters more than simply getting an outcome on the day.

A 47% YES price suggests the Cardinals are close to a coin flip against the Reds, rather than a clear favourite. That fits a series where recent meetings have often been competitive and the edge has swung with pitching and late scoring. The clubs split several close games in 2025, including a 3-1 Reds win in St Louis on 28 April and a 5-0 Cardinals win in a doubleheader on 30 April, while the Reds also took an 11-6 result later in the season. For a newcomer to markets, that kind of pricing usually signals uncertainty rather than a strong view that one side is clearly better.

The main things to watch are the confirmed starting pitchers, line-ups, and any late injury or rest news, because those can move a near-even market quickly. The official game status also matters: if weather interrupts play, the contract remains live until completion, and that can change after line-ups are announced. ESPN’s and MLB’s recent game pages show these teams have traded wins in recent head-to-heads, which helps explain why the market is pricing neither outcome as dominant.

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Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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.

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.

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.