Miami Marlins vs. Philadelphia Phillies

Platform comparison

Active sub-markets

Market context

The Marlins travel to Citizens Bank Park on 17 June for a day game against the Phillies, with first pitch at 1:05 PM ET. The 63% implied probability favouring Philadelphia reflects their standing as a playoff contender with a stronger recent record, whilst Miami enters as a rebuilding outfit with a lower win percentage. Across major prediction platforms, this matchup shows material divergence in how the same underlying probability gets expressed: Polymarket displays it as a binary YES/NO with percentage odds, Kalshi presents decimal equivalents (approximately 1.70 for Phillies), and Betfair's fractional format (7/10) appeals to traditional bettors. Fee structures differ substantially—Polymarket charges a flat 2% on winnings, Kalshi applies per-contract spreads, and Smarkets' commission model varies by volume tier, creating different effective odds for identical outcomes.

Historical matchups between these franchises show the Phillies have dominated recent seasons, though June contests occasionally produce variance due to fatigue and weather patterns affecting day games. The Marlins' bullpen depth and recent roster moves warrant monitoring, particularly any late-season trades or injury updates released before game day. Phillies' starting pitcher assignment and recent offensive form against left-handed starters will influence sharper traders' positioning. Settlement occurs 24 June at 17:05 UTC, allowing seven days post-game for official MLB statistics confirmation. Postponement clauses differ subtly across platforms—Kalshi's rules explicitly require completion within a defined window, whilst Polymarket's framework extends indefinitely until play concludes, creating timing risk for traders holding positions across multiple books.

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 Polymarket Alternative, 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). Polymarket Alternative 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 Polymarket Alternative, 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.

Is this market available outside the US?

Polymarket Alternative is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 does it cost to trade on Polymarket Alternative?

Zero. Polymarket Alternative routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative triggers a quick verification flow that finishes in minutes.