St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

The St. Louis Cardinals face the Cincinnati Reds on 24 May in a regular-season MLB matchup. The current crowd-implied probability of 48% for a Cardinals victory reflects a near-even matchup, though the settlement window extends to 31 May to account for potential postponements. Across major prediction platforms, this fixture shows notable divergence in how odds are presented: Polymarket displays the probability directly at 48%, whilst Kalshi and Betfair express equivalent positions in decimal odds (approximately 2.08 for Cardinals, 1.92 for Reds). Smarkets similarly uses decimal format but charges lower commissions on matched bets, which can shift effective implied probabilities by 1–2 percentage points depending on position size. KYC requirements vary significantly—Polymarket and Kalshi operate under stricter US-focused verification, whilst Betfair and Smarkets accommodate broader international participation, potentially affecting liquidity and pricing depth on this particular fixture.

Historical context suggests Cardinals-Reds matchups in May typically reflect regular-season competitive balance rather than playoff-intensity volatility. The 2023 and 2024 seasons showed these division rivals splitting regular-season series fairly evenly, with home-field advantage accounting for roughly 3–5 percentage points in implied probability. The Cardinals' recent injury status and Cincinnati's bullpen depth will be critical inputs; any roster announcements between now and first pitch could shift the probability by 5–10 points across all platforms.

Traders should monitor starting pitcher confirmation and weather conditions at Great American Ball Park. Rain forecasts or unexpected roster moves typically trigger repricing within 24 hours of game time, particularly on platforms with tighter spreads like Smarkets, where liquidity concentrates around confirmed lineups.

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

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.

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.