Seattle Mariners vs. Pittsburgh Pirates

Platform comparison

Active sub-markets

Market context

The Seattle Mariners face the Pittsburgh Pirates in an MLB interleague contest scheduled for 12:35PM ET on 25 June, with the Mariners favoured to win the game outright. This single-game market resolves to the Mariners if they secure the victory, to the Pirates if they win, and to a 50-50 split only if the match is cancelled or ends in a tie.

Historically, the Mariners have been 6-0 in their last six interleague games when favoured by -201 or greater, a streak that strongly frames the current 0% crowd-implied probability for a Pirates win as a misreading of their dominance in this specific context[1]. Programmatic traders should note that while the Pirates sit at 3-2 in their last five games overall, their road performance against the spread (21-18) lacks the same predictive weight as the Mariners’ interleague favourite record, making the 0% figure a likely utility error rather than a genuine market signal[2].

Key catalysts include the confirmed pitching matchup and Bryan Reynolds’ prop line, which analysts flag as a critical dependency for the Pirates’ run total[4]. Traders approaching this programmatically must monitor live odds updates, which refresh every 15 minutes, and the consensus pick data showing 61% backing the Mariners to cover the -1.5 spread[7]. The primary catalyst remains the Mariners’ ability to maintain their interleague favourite streak, with no recent news suggesting a roster change that would disrupt this trend[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, 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.

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, PolyGram triggers a quick verification flow that finishes in 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.