Arizona Diamondbacks vs. Washington Nationals

Platform comparison

Market context

The Arizona Diamondbacks and Washington Nationals are scheduled to meet in a regular-season MLB game, and this market settles on which club wins the game; a **YES** share here means Arizona wins, while a **NO** share means Washington wins. If the game is postponed, the market stays open until the game is completed, and if it is cancelled with no make-up or ends tied, it resolves 50-50.

A 52% crowd-implied chance for Arizona is only a narrow lean, which fits a matchup that has already been close in recent meetings. Washington beat Arizona 5-3 on 25 July, while Arizona had beaten Washington 5-1 on 7 June, showing that short-run form can swing quickly even when the teams are roughly comparable. In market terms, that kind of price suggests traders see Arizona as slightly more likely, but not strongly favoured, so the number will remain sensitive to line-up and pitching news rather than just season record alone. ESPN’s game pages show both clubs entering with broadly similar records, with Arizona at 33-30 and Washington at 32-32 after the latest result.[1][4]

For traders, the key catalysts are the starting pitchers, any late scratches from the line-up, and whether the scheduled first pitch is affected by weather or a postponement. Because this market resolves only on the official final result, late changes matter more than box-score chatter: a confirmed starter change or a reshuffled batting order can move the probability quickly, especially in a one-game market. Recent result pages also show these teams have traded wins in the current stretch, so the market may react sharply to any edge in pitching confirmation or team availability before first pitch.[1][3][4]

Sources: 1 · 2 · 3 · 4

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 Prediction Market UK, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.

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.

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.