Pittsburgh Pirates vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Pirates have already changed the tone of this series in the last 24 hours, blanking St. Louis 7-0 on Wednesday night after the Cardinals had looked in control in the match-up earlier in the month. That result matters because the market now sits at 28% for Pittsburgh, a price that implies the Cardinals remain the clear favourite even after the split of recent meetings. The most useful comparison is the clubs’ recent head-to-head run: St. Louis had won five straight against Pittsburgh before Wednesday, including a four-game sweep in Pittsburgh at the end of April, so the Pirates are still trying to prove the shutout was more than a one-off.

For traders, the key watchpoints are the starting pitchers, the Cardinals’ response after being held scoreless, and whether Pittsburgh can carry Wednesday’s contact-heavy offence into another early game. ESPN’s game report from Wednesday highlighted Konnor Griffin’s four-hit night and a strong bullpen finish for the Pirates, which is the sort of performance that can swing short-run pricing if the lineup keeps putting men on base. The Cardinals’ recent form in this pairing is still better overall, but the immediate catalyst is whether they rebound quickly from a shutout at home or whether Pittsburgh has found a workable attacking pattern against them.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pittsburgh Pirates vs. St. Louis Cardinals on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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.

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.

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.