Live prediction market odds for Boston Red Sox vs. Cleveland Guardians (1:40 PM ET). Compare prices across Kalshi and Polymarket and ProphetX.
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MARKET RESOLVEDKalshi / Polymarket / ProphetX
Resolved 2026-05-31
This market resolved on 2026-05-31. Boston Red Sox spread minus 4.5 was the officially declared outcome. Prior to resolution, the market peaked at 100%.
Boston Red Sox vs. Cleveland Guardians (1:40 PM ET) — MLB game held on 2026-05-31. Review the historical prediction market odds from Kalshi, Polymarket, and more on Prediction Hunt.
| Candidate |  |  |  |
|---|---|---|---|
Boston Red Sox spread minus 4.5WINNER | — | 100% | — |
Boston Red Sox spread minus 1.5 | 99% | 100% | — |
Boston Red Sox spread minus 2.5 | 99% |
Boston Red Sox vs. Cleveland Guardians (1:40 PM ET) was a prediction market event tracked across 3 platforms (Kalshi, Polymarket, ProphetX). Boston Red Sox spread minus 4.5 led the market at 100% implied probability before resolution. Other contenders include Boston Red Sox spread minus 1.5 at 99%, Boston Red Sox spread minus 2.5 at 99%, Boston Red Sox spread minus 3.5 at 99%.
Boston Red Sox spread minus 4.5 held the lead at 100% implied probability heading into resolution. Behind Boston Red Sox spread minus 4.5, Boston Red Sox spread minus 1.5 at 99% and Boston Red Sox spread minus 2.5 at 99% and Boston Red Sox spread minus 3.5 at 99% were the next closest contenders. The 9.5% cross-platform spread suggested platforms were pricing new information differently, creating potential trading opportunities.
Here were the closing odds across Kalshi, Polymarket, ProphetX: Boston Red Sox spread minus 4.5: 100¢ on Polymarket. Boston Red Sox spread minus 1.5: 99¢ on Kalshi, 100¢ on Polymarket. Boston Red Sox spread minus 2.5: 99¢ on Kalshi, 100¢ on Polymarket. Boston Red Sox spread minus 3.5: 99¢ on Kalshi, 100¢ on Polymarket. The 9.5% spread across platforms highlights where markets disagreed — a gap traders can exploit by buying low on one platform and selling high on another.
A price of 100¢ meant the market estimated a 100% chance that Boston Red Sox spread minus 4.5 would be the outcome. Traders who bought at 100¢ and held through resolution received $1.00 per share — a 0% return on their position. Those on the wrong side received $0.
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Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket and ProphetX.
KalshiIf Boston wins the Boston vs Cleveland professional baseball game originally scheduled for May 31, 2026 at 1:40 PM EDT, then the market resolves to Yes.
The following market refers to the Boston vs Cleveland professional baseball game originally scheduled for May 31, 2026 at 1:40 PM EDT. If this game is postponed or delayed, the market will remain open and close after the rescheduled game has finished (within two days). If the game is cancelled or rescheduled to over two days away, the market will resolve to a fair price in accordance with the rules.
PolymarketIn the upcoming MLB game between the Boston Red Sox and Cleveland Guardians, scheduled for May 31 at 1:40PM ET: This market will resolve to "Boston Red Sox" if the Boston Red Sox win the game. This market will resolve to "Cleveland Guardians" if the Cleveland Guardians win the game. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, or ends in a tie, this market will resolve 50-50. The primary resolution source for this market is the official final statistics of the event as recognized by the governing body or event organizers. However, if the governing body or event organizers have not published final match statistics within 24 hours after the event's conclusion, a consensus of credible reporting may be used instead.
ProphetXSports moneyline - resolves based on official game outcome per ProphetX Prediction Rules
| — |
Boston Red Sox spread minus 3.5 | 99% | 100% | — |
Total over 10.5 | 99% | 100% | — |
Total over 4.5 | 99% | 100% | — |
Total over 5.5 | 99% | 100% | — |
Total over 6.5 | 99% | 100% | — |
Total over 7.5 | 99% | 100% | — |
Total over 8.5 | 99% | 100% | — |
Total over 9.5 | 99% | 100% | — |
Boston Red Sox | 99% | 100% | 95% |
Over 1.5 runs scored | 99% | — | — |
Over 11.5 runs scored | 99% | — | — |
Over 12.5 runs scored | 99% | — | — |
Over 2.5 runs scored | 99% | — | — |
Over 3.5 runs scored | 99% | — | — |
Cleveland Guardians | 1% | 0% | 10% |
Cleveland Guardians spread minus 1.5 | 1% | — | — |
Cleveland Guardians spread minus 2.5 | 1% | — | — |
Cleveland Guardians spread minus 3.5 | 1% | — | — |
Cleveland Guardians spread plus 1.5 | — | 0% | — |
Cleveland Guardians spread plus 2.5 | — | 0% | — |
Cleveland Guardians spread plus 3.5 | — | 0% | — |
Cleveland Guardians spread plus 4.5 | — | 0% | — |
Total under 10.5 | — | 0% | — |
Total under 4.5 | — | 0% | — |
Total under 5.5 | — | 0% | — |
Total under 6.5 | — | 0% | — |
Total under 7.5 | — | 0% | — |
Total under 8.5 | — | 0% | — |
Total under 9.5 | — | 0% | — |
Boston Red Sox spread plus 1.5 | — | — | — |
Boston Red Sox spread plus 2.5 | — | — | — |
Boston Red Sox spread plus 3.5 | — | — | — |
Boston Red Sox
98.0% avg
