Miami Marlins vs. Philadelphia Phillies

Platform comparison

Active sub-markets

Market context

The Philadelphia Phillies travel to Miami on 17 June for a regular-season matchup against the Marlins, with first pitch at 1:05 PM ET. The 95% implied probability favouring a Phillies victory reflects their substantially stronger roster composition and recent form relative to Miami's rebuilding trajectory. Across major prediction platforms, this disparity manifests differently: Polymarket displays the probability directly at 95%, whilst Kalshi and Betfair express equivalent odds in decimal format (approximately 1.05 for Phillies moneyline on Betfair's interface). The fee structures diverge meaningfully—Kalshi charges 2% on both sides of trades, whereas Betfair's commission applies only to net winnings, potentially favouring larger positions on heavily skewed markets like this one. Smarkets similarly charges commission on profit, making it more efficient for backing heavy favourites than Polymarket's flat-fee model.

Historical context matters considerably here. The Phillies have won roughly 58% of head-to-head matchups against Miami over the past five seasons, though this particular season's performance gap is wider than the long-term average. The Marlins' 2024 campaign has been marked by youth development rather than competitive positioning, whilst Philadelphia remains a playoff contender in the National League East. Traders should monitor lineup announcements 24 hours before game time, particularly regarding pitcher assignments—any unexpected rotation changes or injury updates could shift the probability meaningfully. Weather conditions at loanDepot Park in Miami occasionally affect play, though June conditions typically favour standard baseball operations. Settlement on 24 June allows for postponement accommodation, a relevant consideration given Florida's seasonal weather patterns.

Methodology

This page compares Miami Marlins vs. Philadelphia Phillies 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.

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.

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.