St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

St. Louis and Cincinnati meet again in a divisional game that has often been close on the market, and the current 47% YES price sits just below a coin flip. That is broadly consistent with the clubs’ recent profile: ESPN lists them with very similar offensive numbers going into the game, with Cincinnati marginally ahead in runs scored but St. Louis slightly better in batting average. Recent head-to-head results have also been mixed rather than one-sided, which matters in short-horizon markets where one pitching matchup can overwhelm season-long records. On Polymarket, the price is shown as a straight implied probability, while Kalshi and Betfair typically present the same view through different odds formats; Smarkets is usually the cleaner comparison for effective net pricing because commission is explicit. KYC and access rules also differ, so the same 47% view may translate into a different tradable price after fees and eligibility are accounted for.

The main catalysts are roster and schedule news rather than long-run form. MLB.com notes the series has already been affected by a postponement, with a split doubleheader set for Saturday, so any weather or game-time delay risk matters because this market stays open until the game is actually completed. ESPN’s game listing shows the matchup as live and the pre-game line has Cincinnati around -126, which implies the Reds are only a modest favourite rather than a strong one. In practice, traders will watch the announced starters, any late scratches, and whether the postponed schedule changes bullpen usage or line-up decisions, since those factors can move the price more than the broader team record.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares St. Louis Cardinals vs. Cincinnati Reds specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

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.

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.

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.