Pittsburgh Pirates vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

Pittsburgh and St. Louis meet in the finale of a series that has already swung sharply both ways this week: the Pirates shut out the Cardinals 7-0 on Wednesday, while St. Louis had beaten Pittsburgh 10-5 in the earlier set and completed a four-game sweep at PNC Park in April. That recent split helps explain why a 28% crowd-implied price for Pittsburgh is not extreme, but it still leaves the Pirates as a clear away underdog. On exchange-style markets such as Betfair or Smarkets, the same view would usually be shown as a decimal price, while Polymarket’s percentage framing makes the underdog chance easier to compare directly against a sportsbook-style line. Kalshi’s contract structure can look similar in implied probability, but fee treatment and access can change the effective price a trader faces.

The main catalyst is the official line-up and starting pitching confirmation before first pitch at 1:15pm ET, because MLB moneyline markets often move materially once the starter and bench availability are known. Any late scratch, rest day, or bullpen-game announcement matters more than the two clubs’ short head-to-head run. Recent results suggest volatility rather than dominance: St. Louis’ sweep in Pittsburgh showed it can string together offence against Pirates pitching, but the shutout in St. Louis a day later showed the reverse is also live. Traders comparing venues should also note that Polymarket is open to a broader crypto-native audience, while Kalshi requires US compliance and KYC, and Betfair/Smarkets availability and fee structures vary by jurisdiction, which can affect how quickly a 28% view is priced into the market.

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Methodology

This page compares Pittsburgh Pirates vs. St. Louis Cardinals specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). PolyGram routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

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.

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.

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.