St. Louis Cardinals vs. Athletics

Platform comparison

Market context

The St. Louis Cardinals face the Oakland Athletics on 14 May at 3:05 PM ET, with the market pricing a Cardinals victory at 79 per cent implied probability. This reflects the Cardinals' stronger roster composition and recent performance trajectory relative to an Athletics side in the midst of a rebuilding phase. The Athletics have undergone significant roster turnover following their relocation announcement, whilst the Cardinals maintain competitive depth across their lineup.

Historical matchups between these franchises show the Cardinals have held a considerable edge over the past decade, though individual game outcomes remain subject to pitching matchups and daily form. The 79 per cent probability sits near consensus expectations for a team with the Cardinals' win-loss record and strength of schedule positioning. Value considerations hinge on whether the Athletics' recent roster adjustments have produced unexpected competitive improvements, or whether the market has adequately priced in the Cardinals' injury status heading into mid-May.

Key variables for traders centre on starting pitcher announcements, which typically arrive 24–48 hours before game time. Any late-breaking roster moves—particularly concerning the Cardinals' rotation depth or the Athletics' acquisition of veteran talent—could shift the probability meaningfully. Weather conditions at the scheduled venue may also influence play style expectations. The settlement window extending to 21 May accounts for potential postponement, though the standard May schedule typically avoids extended delays.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.