Arizona Diamondbacks vs. St. Louis Cardinals

Platform comparison

Active sub-markets

Market context

The upcoming MLB contest features the Arizona Diamondbacks (40–39) against the St. Louis Cardinals (42–35) at 7:45pm ET on 24 June, with the Cardinals holding a slight home-edge advantage after going 22–18 in home games this season[4][6].

Historical parallels from similar mid-season matchups show that a 100% implied probability is exceptionally rare in MLB, where even strong favourites typically settle between 60–75% implied probability; comparable cases from 2024–25 suggest such certainty often precedes a draw or postponement rather than a decisive win, making this market an outlier compared to standard bookmaker pricing[3][5].

Traders should monitor the official MLB injury report released 24 June, as any late starter change for the Cardinals’ pitching rotation could shift the outcome significantly, and recent pregame analysis from ESPN notes the Cardinals’ pitching depth as a key variable[4][6]. Platform comparisons reveal Polymarket’s 100% implied probability contrasts with Kalshi’s decimal odds (where a 51.9% chance for the Cardinals translates to ~1.93 odds) and Betfair’s fee structures, which charge 2–5% on winnings versus Polymarket’s zero-fee model, while Kalshi requires full KYC and Polymarket remains permissionless[1][3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Arizona Diamondbacks vs. St. Louis Cardinals from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, 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?

Polymarket Alternative 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.

What does it cost to trade on Polymarket Alternative?

Zero. Polymarket Alternative 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.