St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

The Cardinals and Reds are scheduled to play in St Louis on 22 May, with the market currently pricing the home side at 48% to win. That sits close to a true coin-flip, which is consistent with a single MLB game where starting pitcher quality, bullpen usage and line-up news can swing the result quickly. For context, the teams have already split recent meetings: the Cardinals won 3-0 on Tuesday, while the Reds answered with a 3-1 win in the next game. ESPN’s live game page lists the clubs as nearly level on underlying team indicators, with the Cardinals holding a slight edge in home runs but the Reds showing marginally better slugging and a lower ERA.

For traders, the key catalysts are late line-up cards, any change to the announced starters, and weather or delay risk that could affect bullpen availability before first pitch. MLB.com and ESPN are the relevant real-time sources for official line-ups, status updates and final statistics, which matter because postponements keep the market open until completion, while any cancellation with no make-up game or a tie resolves 50-50. On accessibility, a no-KYC threshold up to $1,500 means smaller positions may be available without identity checks, although that does not change the underlying settlement rules. From a regulatory angle, German GlüStV treatment and US CFTC reach are separate jurisdictional issues: GlüStV can affect whether participation is locally restricted in Germany, while CFTC scrutiny is relevant to platforms and market structure in the US, even when the event itself is a straightforward baseball game.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track St. Louis Cardinals vs. Cincinnati Reds on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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.

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.

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.