Arizona Diamondbacks vs. St. Louis Cardinals

Platform comparison

Market context

Polymarket currently has this game priced at **49% YES**, so the contract is almost a coin flip between Arizona and St. Louis. On Polymarket, buyers are not trading the baseball outcome directly; they are buying and selling **USDC-settled conditional tokens on Polygon**, with the market paying out to the side named in the final official result, or 50-50 if the game is cancelled or ends tied.

That near-even price makes sense against the recent head-to-head split. St. Louis has already beaten Arizona twice this month, including a 3-2 win on 23 June and a 5-4 win on 17 July, both by one run, which points to a tight matchup rather than a clear mismatch.[2][1] For a trader, the key read is that the market is not assigning much weight to either side’s advantage, and small changes in line-up news or pitching confirmation could move it more than the current score implied by recent results.

The main catalysts are ordinary but important: confirmed starters, late scratches, travel and rest adjustments, and any schedule changes before first pitch. Because the settlement window runs well beyond game day, the more relevant dependency is whether the fixture is played to completion; postponement would keep the market open until make-up completion, while a cancellation or tie would force a 50-50 resolution under the rules. The official final statistics are the primary source for settlement, so traders on-chain are ultimately exposed to the completed MLB result rather than any pre-game controversy.

Sources: 1 · 2

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.