St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

Polymarket is pricing the St. Louis Cardinals vs Cincinnati Reds contract at 48% YES, so the market is close to a coin flip rather than a strong lean. On Polygon, traders are buying and selling conditional tokens settled in USDC, with the position resolving only when the official result is recorded. At that level, the price implies little separation between the clubs, and small moves in the moneyline, line-up news, or in-game scoring can shift the contract materially before settlement.

Recent form suggests why the market sits near the middle. The Reds have shown a wide swing in results against St. Louis and in the wild-card race, including a 3-0 shutout loss to the Cardinals earlier in the week and a 3-1 win in the same stretch, while CBS Sports also lists a 2025 meeting in which Cincinnati won 11-6. ESPN’s pre-game page for tonight has Cincinnati as a modest favourite at -126 and shows the Reds with a stronger away record than their overall mark, which helps explain why the probability is not more lopsided despite St. Louis being the nominal home side.

For traders, the key catalysts are the confirmed line-ups, starting pitchers and any late scratches, because those are the inputs most likely to move a market this tight before first pitch. The game is scheduled for 6:40pm ET, so any official roster or weather-related delay matters only if it changes who actually starts or whether the contest is completed. If the game is postponed and replayed, the contract stays open until the official final; if it is cancelled outright or ends in a tie, it resolves 50-50 under the market rules.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews St. Louis Cardinals vs. Cincinnati Reds across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.