Tampa Bay Rays vs. Miami Marlins

Platform comparison

Active sub-markets

Market context

The Rays and Marlins meet on 6 June at 4:10 PM ET in a regular-season matchup between two AL East and NL East clubs respectively. The settlement window extends to 13 June at 20:10 UTC, allowing for postponements common in Florida's June weather patterns. A 6% implied probability for the Rays suggests the market has assigned substantial confidence to Miami, though the specific matchup details—starting pitchers, recent form, and ballpark conditions—will determine whether this reflects genuine underlying value or market inefficiency.

Historical context matters here: the Marlins have won roughly 45% of their games against Tampa Bay over the past five seasons, yet the Rays maintain a marginal edge in head-to-head records since 2019. The current 6% probability implies Miami is favoured at approximately 94%, a spread that typically emerges when one team carries significant injury concerns, recent poor performance, or faces a notably superior opponent. For algorithmic traders, this represents a scenario where conditional order logic should account for roster announcements up to game time, as late-inning pitcher availability often shifts probabilities materially in low-probability markets.

Traders monitoring this market programmatically should track MLB injury reports through 5 June and any weather alerts for Miami-Dade County that might trigger postponement protocols. The settlement terms specify 50-50 resolution only if the game is cancelled with no make-up scheduled or ends in a tie—an outcome so rare in modern baseball that it functions primarily as a technical safeguard rather than a meaningful trading consideration.

Methodology

We track Tampa Bay Rays vs. Miami Marlins on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Review 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 Polymarket Review UK?

Zero. Polymarket Review 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.