Pittsburgh Pirates vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The Cardinals have just completed a four-game sweep of the Pirates in Pittsburgh, taking the series finale 10-5 on 30 April and the opener 11-7 two days earlier. That leaves the market’s 0% yes price anchored to a recent, one-sided run rather than a neutral base rate: St. Louis has won five straight against Pittsburgh, and the last two meetings were both high-scoring Cardinals wins. In a head-to-head like this, a zero-implied probability usually reflects either a data issue or a view that the listed outcome is effectively unavailable, not a balanced read of the teams.

For today’s outlook, the main catalysts are the confirmed line-ups, any late pitching changes, and whether the game starts on time at 7:45pm ET. The official Cardinals scoreboard and MLB game page are the best checks for status, while ESPN’s recent game reports show the most recent form in this fixture. If there is a postponement, the market stays open until the game is completed; if it is cancelled or ends tied, it settles 50-50. That makes the final pre-game injury and starter announcements the key watchpoints rather than the earlier series results alone.

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

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.