Miami Marlins vs. Pittsburgh Pirates

Platform comparison

Active sub-markets

Market context

The Miami Marlins travel to Pittsburgh on 13 June for a regular-season matchup against the Pirates, with the contest scheduled for 4:05 PM ET. The 34% implied probability for a Marlins victory reflects their recent form and roster composition relative to Pittsburgh's competitive standing. Across major prediction platforms, this probability translates differently: Polymarket displays it as a decimal odd of approximately 1.52 for a Marlins win, whilst Kalshi and Betfair express the same likelihood through fractional odds (around 7/13), creating surface-level divergence that masks identical underlying probabilities. Fee structures vary meaningfully—Polymarket applies a 2% settlement fee, Kalshi charges 5% on net profits, and Betfair's commission model depends on market liquidity—making the effective return on a £100 stake materially different across platforms despite identical odds.

Historical context matters here: the Marlins have underperformed expectations in recent seasons, whilst the Pirates have shown incremental improvement in their rebuild phase. June matchups between these divisional rivals typically favour the team with stronger starting pitching depth, a variable that shifts week-to-week based on injury reports and rotation schedules. Traders should monitor roster announcements through 12 June, particularly any late scratches or bullpen adjustments. The settlement window extends to 20 June, accommodating potential postponements due to weather—relevant given Miami's June climate patterns. KYC requirements differ across platforms: Polymarket operates with lighter verification for US users, whilst Kalshi and Smarkets enforce stricter identity checks, affecting accessibility for certain trader demographics.

Methodology

This page compares Miami Marlins vs. Pittsburgh Pirates 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

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 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.

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.

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.