St. Louis Cardinals vs. Cincinnati Reds

Platform comparison

Active sub-markets

Market context

The St. Louis Cardinals and Cincinnati Reds are due to play in an MLB game scheduled for 22 May at 6:40pm ET, with the market currently pricing the Cardinals at 48%. That level suggests a near coin-flip contest rather than a strong directional view, which is consistent with recent head-to-head results swinging both ways: Cincinnati beat St Louis 3-1 in April 2025, while St Louis also produced shutout-type results in more recent meetings. In practical terms, a sub-50% quote like this usually reflects modest differences in starting pitching, line-up availability, and venue rather than a broad view that one side is fundamentally stronger.

For traders, the main catalysts are the confirmed starters, late line-up changes, and any weather or postponement risk, because this market stays open if the game is delayed and only resolves once the game is completed. The official MLB game feed and live score services are the relevant factual references once line-ups and bullpen usage are known. On accessibility, a market of this sort is typically straightforward for users in jurisdictions where access is permitted, but German GlüStV rules can make participation and marketing more restrictive, while US CFTC reach remains relevant where a platform offers event-contract style products. Where a venue advertises “no-KYC up to $1,500”, that generally means smaller-volume access may be available without full identity verification, but limits, source-of-funds checks, and jurisdictional blocks can still apply to this specific market.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

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.