Pittsburgh Pirates vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Pirates and Cardinals are due to meet in St Louis, and the market is currently pricing the Pirates at 0% YES. That is striking against recent head-to-head form: St Louis have won the last five meetings listed by StatMuse, and the Cardinals took the most recent series in late April, including a 10-5 win and a 5-4 win at Pittsburgh. Over a longer sample, the Cardinals also hold the clear historical edge, which helps explain why a flat zero can arise on some platforms even when the baseball outcome is not remotely certain. Polymarket, Kalshi, Betfair and Smarkets do not present this in the same way: prediction markets quote implied probability directly, while exchange books usually show decimal prices and net exposure after commission, with access also shaped by KYC and jurisdiction.

For traders, the main catalysts are the confirmed starting pitchers, lineup cards, and any late injury or weather changes. If the game is still pending, postponement risk matters because a delayed first pitch can move the price more than the underlying matchup; if it is washed out and not replayed, the market can settle 50-50 under the contract terms. ESPN’s recent game reports showed the Cardinals scoring early against Pittsburgh’s pitching, so any repeat of that rotation setup would matter, but the edge can turn quickly if either club rests regulars or changes the starter. On comparison sites, the same information can be easier to express as a probability on Polymarket than as a back-and-lay spread on Betfair, while Kalshi and Smarkets may price the event differently once fees and account eligibility are included.

Sources: 1 · 2 · 3 · 4 · 5

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

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

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.

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.

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.