TOTAL VOLUME:

$134.1b

24H VOL:

$141,541,542

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,440,096,988

406,065

Markets across

30,522

events

MATCHED EVENTS:

2,692

PLATFORM COVERAGE:

5

Polymarket:

39%

VS.

Kalshi:

61%

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Seattle Storm vs. Phoenix Mercury
kalshi
polymarket

Seattle Storm vs. Phoenix Mercury

Volume:
$228,687

Spread -8.5

 - Polymarket

Spread -8.5 - Polymarket

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved Jun 25, 2026

Closed: Jun 20, 3:00 PM EST

polymarket

Polymarket

View
Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result
polymarket

Spread -8.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$20,155
N/A
N/A
N/A
Settled
Yes
polymarket

Spread -7.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$18,092
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 160.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$14,233
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 162.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$4,998
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 163.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$3,572
N/A
N/A
N/A
Settled
Yes
polymarket

Spread -6.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$2,009
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 161.5

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$608
N/A
N/A
N/A
Settled
Yes
polymarket

Seattle Storm vs. Phoenix Mercury

View
0%
Yes 0¢No 100¢
—
N/A
$164,644
N/A
N/A
N/A
Settled
Yes
kalshi

Game goes to overtime

View
0%
Yes 0¢No 100¢
100¢
N/A
$376
N/A
N/A
$369
Settled
No
Total markets: 9

Description

This event group covers the WNBA matchup between the Seattle Storm and Phoenix Mercury scheduled for June 20, 2026. Kalshi offers a binary overtime market, while Polymarket offers a head-to-head winner market with detailed postponement and cancellation rules.

PredictionHero - Resolution Divergence Alerts (RDA)

Divergence Detected

Issue: Kalshi and Polymarket measure different aspects of the same game. Kalshi resolves on overtime occurrence (binary), while Polymarket resolves on final winner including overtime. These are complementary SKUs, not contradictory.Hero tip: Do not treat Kalshi overtime YES as a proxy for either team winning. A Storm OT victory satisfies both Kalshi YES and Polymarket SEATTLE STORM, but Kalshi NO does not imply Polymarket resolves to either team - it only means regulation ended the game. Polymarket is the primary winner oracle.

Critical divergence points:

  • Kalshi: Overtime occurrence binary. Resolves YES if game reaches overtime, NO if game ends in regulation. Quote: 'If Seattle and Phoenix go to overtime in the Seattle vs Phoenix women's professional basketball game originally scheduled for Jun 20, 2026, then the market resolves to Yes.'
  • Polymarket: Winner determination with postponement and cancellation rules. Resolves to Seattle Storm, Phoenix Mercury, or 50-50 (if canceled with no makeup). Quote: 'The result will be determined based on the final score including any overtime periods. 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, this market will resolve 50-50.'
Our PredictionHero Resolution Divergence Alerts (RDA) are there to help users identify potential differences across platforms. They do not replace or supersede the official rules and description of any prediction market. Users are solely responsible for reviewing and understanding the applicable rules and resolution criteria before placing any trade or bet. If you notice a potential inconsistency, discrepancy, or error in an alert, please report it to our team so we can review and improve the accuracy of our data.

Polymarket

In the upcoming WNBA game, scheduled for June 20 at 3:00PM ET: If the Seattle Storm win, the market will resolve to "Seattle Storm". If the Phoenix Mercury win, the market will resolve to "Phoenix Mercury". 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, this market will resolve 50-50. The result will be determined based on the final score including any overtime periods.

Kalshi

If Seattle and Phoenix go to overtime in the Seattle vs Phoenix women's professional basketball game originally scheduled for Jun 20, 2026, then the market resolves to Yes.

Frequently asked questions

Prediction markets and sportsbooks price events differently because they operate under distinct incentive structures. Sportsbooks set odds to balance action and lock in profit margins, while prediction markets rely on trader capital and belief to establish prices. This market's odds reflect what thousands of individual traders are willing to stake, often incorporating real-time information faster than traditional books update their lines. Comparing the two can reveal where sharp traders see value relative to conventional sports betting markets.

Polymarket and Kalshi may show different prices because they serve distinct trader bases, use different market-making mechanisms, and sometimes frame outcomes slightly differently. Polymarket and Kalshi can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. Liquidity concentration, fee structures, and user demographics also influence how quickly each platform incorporates new information. Price gaps between platforms create arbitrage opportunities for traders monitoring both venues, and these spreads typically narrow as traders exploit the difference.

Key catalysts include roster changes, injury announcements to star players, recent team performance trends, and head-to-head historical matchups. Betting line movement from major sportsbooks often influences prediction market traders, as does breaking news about player availability or coaching decisions. Closer to game day, weather conditions and late-breaking team updates typically drive final repricing. Monitor team social media and sports news outlets for developments that could shift trader conviction in either direction.