St. Louis Cardinals vs. San Diego Padres

Platform comparison

Market context

The St. Louis Cardinals face the San Diego Padres on 10 May at 4:10 PM ET in a regular-season MLB fixture. The 0% YES probability reflects either extreme confidence in a Padres victory or insufficient liquidity in the market at present. For algorithmic traders, this represents a potential arbitrage signal worth investigating against alternative sportsbooks and live-odds feeds, particularly given that pre-game probabilities typically distribute across both outcomes unless one team carries overwhelming injury or form disadvantages.

Historical matchups between these franchises show competitive balance; neither club has demonstrated consistent dominance in recent seasons. The Cardinals' 2024 performance and current roster composition relative to the Padres' pitching depth and offensive capability will determine fair-value odds. Traders should cross-reference opening-line movements from established sportsbooks—typically released 5–7 days before game time—to identify whether the market's extreme skew reflects genuine information or liquidity constraints.

Key catalysts include confirmed starting pitcher announcements (usually finalised 24 hours prior), late-breaking injury reports affecting lineup construction, and weather conditions at Petco Park that could favour either team's style of play. Conditional order logic should account for postponement scenarios; the settlement window extends to 17 May, allowing for make-up games. Traders implementing automated monitoring should flag any significant line movement on external markets as a signal to reassess the 0% reading, since such extreme probabilities rarely persist once institutional liquidity enters.

Methodology

We track St. Louis Cardinals vs. San Diego Padres across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. PolyGram is highlighted because it routes directly into the same Polymarket order book without taking a margin.

Resolution & payout

Resolution source: This market settles from the official publication at https://www.mlb.com/. A proposer submits the result to the UMA Optimistic Oracle on Polygon, the two-hour challenge window opens, and the smart contract pays out in USDC.

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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 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.