Chicago Cubs vs. New York Mets

Platform comparison

Active sub-markets

Market context

The Chicago Cubs and New York Mets face off tonight at 7:10PM ET in a pivotal MLB matchup, with the Cubs holding a slight edge as the 51% YES favourite on prediction markets. This game is the first of a doubleheader, and the market resolves to the Cubs if they win, to the Mets if they win, or 50-50 if postponed without a make-up or cancelled entirely.

Historical consensus data shows a similar pattern: 62% of public picks favour the Cubs, while 65% expect the total to exceed 8.0 runs, mirroring the current 51% implied probability on Polymarket[1]. Traditional books like Kalshi and Betfair diverge here; Kalshi displays decimal odds (Cubs +100, Mets -120) whereas Polymarket uses implied probability, and fee structures vary significantly—Kalshi charges no trading fees but requires KYC, while Polymarket offers lower KYC barriers but embeds fees in the spread[2]. Smarkets and Betfair also differ in their decimal-to-probability conversion, creating minor arbitrage opportunities for traders monitoring these platforms.

Traders should watch for late-injury updates and pitching line-up confirmations, as the Mets’ moneyline at -120 suggests they are the slight underdog despite the Cubs’ home advantage[2]. Recent trends indicate the Mets have struggled against left-handed pitching, a dependency that could shift the probability if the Cubs’ starter is confirmed as a lefty. Bleacher Report notes the Cubs are priced at -106 on MARQ, while the Mets sit at -110, highlighting the tight margin[4]. Any announcement of a starting pitcher change or weather delay could alter the settlement outcome before the 2026-07-01 deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Chicago Cubs vs. New York Mets 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

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 it cost to trade on Kalshi Alternative UK?

Zero. Kalshi Alternative UK 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.

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.