St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

Polymarket has this Cardinals-Reds contract at 47% YES, so the market is leaning slightly towards St. Louis but still treating Cincinnati as close to a coin flip on Polygon, settled in USDC through conditional tokens once the official result lands. That pricing sits below a straight 50-50 read, which is consistent with a game where the home edge is not overwhelming and the clubs are already tightly matched in the standings.

Recent head-to-head results have been mixed rather than one-sided. The teams split recent meetings in 2025, with Cincinnati taking a 4-1 win in June after St. Louis had earlier shut them out 3-0 in the same series. ESPN listed the Cardinals at 28-21 and the Reds at 26-24 entering the game, with St. Louis slightly better on batting average and home runs, while Cincinnati carried the better away record. That sort of split profile usually keeps the contract near the middle unless a starting pitcher change or late lineup scratch shifts the edge.

Traders should watch the confirmed line-ups, bullpen availability, and any weather or postponement risk before first pitch, because the market stays open if the game is delayed and only resolves on the official final result. ESPN’s live game page is the relevant pre-game reference here, while MLB’s game story and final stats will matter for settlement if the contest is completed. If the game is cancelled outright or ends tied, the market resolves 50-50, which is the main mechanical edge case for holders.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track St. Louis Cardinals vs. Cincinnati Reds on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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.

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.

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.