Pittsburgh Pirates vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Pittsburgh Pirates visit the St. Louis Cardinals this afternoon, with the market pricing the Pirates at 32% and, by implication, the Cardinals as the clear favourite. That sits broadly in line with recent form and recent head-to-head results: St. Louis swept Pittsburgh in a four-game set in late April, including an 11-7 win and a 10-5 win, and the Cardinals also shut out the Pirates 7-0 on Wednesday. Over the last five meetings, St. Louis is 4-1 against Pittsburgh, so the consensus is firmly towards the home side. The main value question is whether the market has already fully priced in that one-sided run of results, because a 32% underdog line still leaves room for the Pirates if the pitching matchup narrows the gap.

For traders, the key catalysts are the starting pitchers, line-up confirmations, and any late scratches before the 1:15pm ET first pitch at Busch Stadium. One recent wrinkle is that the teams have been playing consecutive games against each other, so bullpen usage and recovery matter more than in a normal spot. The official scoreboard and game pages from MLB and ESPN show the series context, but the win probability will turn most sharply on who is actually announced to start and whether either club rests regulars after Wednesday’s shutout. If the Cardinals roll out a stronger rotation arm, the favourite case strengthens; if Pittsburgh lands the better starter or an improved batting order, the 32% yes side looks more competitive than the consensus suggests.

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Methodology

This page reviews Pittsburgh Pirates vs. St. Louis Cardinals across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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 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 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.