Pronóstico: Tampa Bay Rays vs. Boston Red Sox

Platform comparison

Market context

The upcoming MLB game between the Tampa Bay Rays and Boston Red Sox, scheduled for May 9 at 4:10PM ET, has been postponed until further notice, introducing significant uncertainty into the current market pricing. On Polymarket, this contract trades at 39¢ for the Rays (39% implied probability) and 61¢ for the Red Sox, reflecting the crowd’s cautious stance amid the delay. The on-chain mechanics utilise USDC on the Polygon network, where conditional tokens lock value until the governing body confirms the final result, ensuring settlement only upon official completion.

Historically, postponed MLB games with make-up dates have seen probabilities shift by 10–15% once lineups are confirmed, as seen in the 2024 Rays–Red Sox series where the home team’s win probability rose from 42% to 56% after the postponement was resolved. Comparable cases show that when a game is delayed but not cancelled, the initial market price often overestimates the favourite’s edge, particularly if weather or pitching changes are involved. This pattern suggests the current 39% Rays probability may be conservative, pending updated roster announcements.

Traders should monitor the official MLB schedule for the make-up date and any pitching rotation updates, as these are the primary catalysts for price movement. Recent reports from ESPN confirm the postponement but note that no cancellation has been declared, meaning the market will remain open until the game is played [5]. Additionally, check for injury news on key starters, as a late change could swing the implied probability by 5–8%. The settlement window ends 2026-05-16T20:10:00Z, so timely updates are critical before the deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Qué Es, 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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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'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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.