Arizona Diamondbacks vs. Seattle Mariners (10:10 PM ET) is a prediction market event currently tracked across 3 platforms (Kalshi, Polymarket, ProphetX). Seattle Mariners spread plus 3.5 leads at 88% implied probability, making it the market favorite. Other contenders include Arizona Diamondbacks spread plus 4.5 at 86%, Arizona Diamondbacks spread plus 3.5 at 81%, Seattle Mariners spread plus 2.5 at 81%.

What is moving the odds on "Arizona Diamondbacks vs. Seattle Mariners (10:10 PM ET)"?

Seattle Mariners spread plus 3.5 currently leads at 88% implied probability. Behind Seattle Mariners spread plus 3.5, Arizona Diamondbacks spread plus 4.5 at 86% and Arizona Diamondbacks spread plus 3.5 at 81% and Seattle Mariners spread plus 2.5 at 81% are the next closest contenders. The 42.0% cross-platform spread suggested platforms were pricing new information differently, creating potential trading opportunities.

What are the current odds for "Arizona Diamondbacks vs. Seattle Mariners (10:10 PM ET)" across platforms?

Here are the latest odds across Kalshi, Polymarket, ProphetX: Seattle Mariners spread plus 3.5: 88¢ on Polymarket. Arizona Diamondbacks spread plus 4.5: 86¢ on Polymarket. Arizona Diamondbacks spread plus 3.5: 81¢ on Polymarket. Seattle Mariners spread plus 2.5: 81¢ on Polymarket. The 42.0% spread across platforms highlights where markets disagree — a gap traders can exploit by buying low on one platform and selling high on another.

What does it mean that Seattle Mariners spread plus 3.5 is at 88%?

A price of 88¢ means the market estimates a 88% probability that Seattle Mariners spread plus 3.5 will be the outcome. Buying one share at 88¢ pays out $1.00 if correct — a 14% return — or $0 if wrong. This is the core mechanic of prediction markets: the price directly reflects the crowd's probability estimate.

Market Rulebook: Arizona Diamondbacks vs. Seattle Mariners (10:10 PM ET)

Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket and ProphetX.

Rules for Candidate:

Kalshi

Primary Rule

If Arizona wins the Arizona vs Seattle professional baseball game originally scheduled for May 30, 2026 at 10:10 PM EDT, then the market resolves to Yes.

Edge Cases

The following market refers to the Arizona vs Seattle professional baseball game originally scheduled for May 30, 2026 at 10:10 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.

Resolution Oracles

Kalshi Rules

Polymarket

Primary Rule

In the upcoming MLB game between the Arizona Diamondbacks and Seattle Mariners, scheduled for May 30 at 10:10PM ET: This market will resolve to "Arizona Diamondbacks" if the Arizona Diamondbacks win the game. This market will resolve to "Seattle Mariners" if the Seattle Mariners 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.

Resolution Oracles

UMA Optimistic OracleConsensus of Sources

ProphetX

Primary Rule

Sports moneyline - resolves based on official game outcome per ProphetX Prediction Rules

Resolution Oracles

ProphetX Rules

Arizona Diamondbacks vs. Seattle Mariners (10:10 PM ET)

About This Market

Price History

Live Markets

Frequently Asked Questions

Smart Trade Router

Market Rulebook: Arizona Diamondbacks vs. Seattle Mariners (10:10 PM ET)

Resolution Oracles