Colorado Rockies vs. Athletics

Platform comparison

Active sub-markets

Market context

The Colorado Rockies travel to Oakland to face the Athletics on 13 June at 10:05 PM ET in a regular-season MLB matchup. The 43% crowd-implied probability favouring the Rockies reflects modest confidence in Colorado despite home-field disadvantage for Oakland. Across major prediction platforms, this probability translates differently: Polymarket displays it as a decimal odd of approximately 1.75 for a Rockies win, whilst Kalshi's binary contract structure presents the same underlying probability but with its own fee mechanics—typically lower friction for smaller stakes. Betfair's exchange model would show this as a back price around 2.30, with the lay side offering tighter margins. Smarkets charges a 2% commission on net winnings, which affects position sizing calculations relative to Kalshi's flat-fee model.

Historical context matters here: the Rockies have struggled at altitude-neutral venues this season, whilst Oakland's recent form has been volatile but occasionally competitive in June matchups. Neither team has established clear momentum heading into this fixture. The settlement window extends to 21 June, providing a buffer for postponements—relevant given Colorado's June weather patterns and Oakland's occasional scheduling complications.

Traders should monitor roster updates through 12 June, particularly injury reports for both teams' starting pitchers, as these typically move probabilities 2–4 percentage points on major platforms. Recent Athletics announcements regarding their rebuild trajectory have depressed long-term valuations but created short-term volatility in individual game pricing. Weather forecasts for Oakland on game day and any last-minute lineup adjustments will be the primary catalysts affecting the current 43% assessment.

Methodology

This page compares Colorado Rockies 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

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). Kalshi Alternative UK 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 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.

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.