Cincinnati Reds vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Cincinnati Reds face the St. Louis Cardinals on 6 June at 2:15 PM ET in a regular-season matchup. The 72% implied probability favouring Cincinnati reflects their standing relative to St. Louis at the time of market creation. Across major prediction platforms, this probability translates differently: Polymarket displays it as a decimal of approximately 1.39 for a Reds win, whilst Kalshi and Betfair express the same likelihood through their respective odds formats (around 2.78 decimal on Betfair). Fee structures diverge meaningfully—Polymarket charges 2% on both sides, Kalshi typically charges 2% on the winning side only, and Betfair's commission varies by market liquidity. Smarkets operates at 2% commission as well, though its fractional odds presentation appeals to UK traders accustomed to traditional bookmaking notation.

Historical context matters here: the Reds and Cardinals have played 2,500+ times since 1900, with Cincinnati holding a marginal edge in recent seasons. The 72% probability suggests the market is pricing in Cincinnati's roster composition and recent form, though this figure can shift substantially on pitcher announcements or injury news in the 48 hours before first pitch. Traders should monitor MLB transaction wires for any roster moves, bullpen availability, or weather forecasts for the Cincinnati area, as June games occasionally face rain delays that could extend the settlement window beyond the scheduled 18:15 UTC closure on 13 June.

Methodology

This page compares Cincinnati Reds vs. St. Louis Cardinals 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 Polymarket Alternative UK, 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

Where can I trade this market with the lowest fees?

On Polymarket Alternative UK, 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?

Polymarket Alternative UK 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 does it cost to trade on Polymarket Alternative UK?

Zero. Polymarket Alternative UK 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, Polymarket Alternative UK 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.