St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

The St. Louis Cardinals face the Cincinnati Reds on 24 May at 1:40 PM ET in a regular-season National League Central matchup. The 48% implied probability for a Cardinals victory reflects a near-even contest, though the settlement window extends to 31 May to accommodate potential postponements. Across major prediction platforms, this fixture shows modest divergence in how the market is priced: Polymarket's binary structure reports the probability directly, whilst Kalshi's equivalent contract would display decimal odds (approximately 1.92 for Cardinals moneyline), and Betfair's fractional odds format (around 15/8) appeals to traders accustomed to traditional sportsbook conventions. Fee structures vary meaningfully—Polymarket charges 2% on winnings, Kalshi takes 0–2% depending on volume, and Betfair's commission scales from 2–5%—making the effective return on small-stake positions materially different across venues.

Historical head-to-head records between these division rivals provide context for the current odds. The Cardinals and Reds have split recent seasons relatively evenly, with neither club establishing consistent dominance in May matchups over the past three years. Roster depth and injury status remain critical: both teams' starting pitching assignments and any late-roster moves announced before first pitch will influence sharper traders' reassessment of the 48% baseline.

Traders should monitor weather forecasts for St. Louis, as afternoon games in late May face occasional rain delays that could trigger the postponement clause. Injury reports released within 24 hours of game time—particularly regarding key position players or starting pitchers—typically prompt repricing on all platforms, though Smarkets' liquidity in niche sports markets may lag slightly behind Polymarket during such updates.

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

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). PolyGram routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

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.

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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.