Pittsburgh Pirates vs. St. Louis Cardinals

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Active sub-markets

Market context

The Pittsburgh Pirates and St. Louis Cardinals meet again at Busch Stadium on 21 May, with the market leaning towards a Cardinals win, but still pricing Pittsburgh at only 28% implied. That figure sits against recent head-to-head form that has been lopsided at times: St. Louis swept a four-game set in Pittsburgh in late April, including a 10-5 win over Paul Skenes on 30 April, before the Pirates answered with a 7-0 shutout at St. Louis on 20 May. Over the Cardinals’ last five games against Pittsburgh, St. Louis has gone 4-1 and hit .260 as a team, a useful comparator for how quickly the matchup can swing.

For traders, the key catalyst is whether Pittsburgh’s offence can build on the 7-0 result cited by MLB.com, which highlighted a team-wide effort and a shutout bullpen performance behind Konnor Griffin’s four-hit game. The main dependencies are starting pitching and whether the Pirates can avoid another early deficit against a Cardinals rotation that has already exposed them once this season. With the market open until the game is completed if postponed, the practical watchpoints are line-up confirmations, any late pitching change, and whether St. Louis carries over the home-field edge after taking the previous meeting.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Pittsburgh Pirates vs. St. Louis Cardinals across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. PolyGram routes every trade through to Polymarket — at 0% fees.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

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 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.

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.