Pittsburgh Pirates vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Pirates and Cardinals meet again in St. Louis on 21 May, with the market heavily favouring a Cardinals win. That sits alongside the recent form line: St. Louis swept Pittsburgh in late April, winning 11-7 and 10-5, before the Pirates responded with a 7-0 shutout on 20 May to level the series. In head-to-head terms, recent results have been lopsided enough to support a high favourite price, but the latest shutout is a reminder that single-game outcomes can swing sharply when one club’s bats cool. For platform comparison, Polymarket-style markets quote this as an implied probability, while Kalshi, Betfair and Smarkets are typically read through prices/decimal odds and exchange fees rather than a single headline percentage; that makes the same 91% view look different once commissions and bid-offer spreads are included.

For traders, the key catalysts are the confirmed starters, late line-up changes and bullpen availability after the 20 May game. A short-rest reliever or a scratch in the middle of the order can matter more than the broader season record in a one-off baseball market, especially when the crowd price is already compressed. ESPN’s game coverage for the recent meetings and MLB’s scoreboard show the teams have been alternating blowout-style results, so any pre-match injury note or pitching announcement could move the fair price more than the recent H2H alone. If the game is delayed, the market stays open until it is completed, so postponement risk is less about settlement and more about the final state of the listed starters and line-up.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Pittsburgh Pirates vs. St. Louis Cardinals from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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.

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.

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.

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.