New York Yankees vs. Athletics

Platform comparison

Active sub-markets

Market context

The New York Yankees face the Oakland Athletics on 31 May at 4:05 PM ET in a regular-season MLB matchup. The 62% crowd-implied probability favours the Yankees, reflecting their stronger historical record and current roster depth. Across major prediction platforms, this probability translates differently: Polymarket displays it as 1.62 decimal odds, whilst Kalshi's binary contract structure presents the same information as a $0.62 settlement value. Betfair and Smarkets typically quote fractional odds around 8/13, though their fee structures—Betfair's 5% commission versus Smarkets' variable 2–4% maker-taker model—create divergent effective returns for matched bets. KYC requirements vary significantly; Kalshi operates under stricter US regulatory oversight, whilst Smarkets accepts UK and EU traders with lighter verification.

Historical matchups between these franchises show the Yankees winning approximately 58% of contests over the past decade, slightly below the current market consensus. The Athletics' recent performance has been inconsistent, with injury-related roster changes affecting their competitive positioning. Traders should monitor late-breaking roster announcements, particularly regarding starting pitcher confirmation and any weather-related delays that could postpone the fixture. The settlement window extends to 7 June 2026, providing a buffer for rescheduled games, though cancellation without a make-up would trigger the 50–50 resolution clause outlined in the market terms.

Methodology

This page compares New York Yankees vs. Athletics specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi Alternative UK, 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.

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.

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, Kalshi Alternative UK triggers a quick verification flow that finishes in minutes.