TOTAL VOLUME:

$134.1b

24H VOL:

$133,388,117

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,436,095,462

405,232

Markets across

30,526

events

MATCHED EVENTS:

2,693

PLATFORM COVERAGE:

5

Polymarket:

39%

VS.

Kalshi:

61%

BETA
Dashboards
Insights
Indices
Tour
All
Trending
Breaking
New
Ending Soon
Politics
Sports
Crypto
Companies
Elections
Financials
Economics
Other
Entertainment
Science and Technology
UFC 331: Casey O'Neill vs. Eduarda Moura (Women's Flyweight, Early Prelims)
polymarket
kalshi

What is the result of O'Neill vs Moura?

Volume:
$1,156,086

Casey O'Neill

 - Kalshi

Casey O'Neill - Kalshi

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved Sep 19, 2026

Closed: Sep 19, 6:30 PM EST

kalshi

Kalshi

View
Join Kalshi and score $25 for your first trade.
Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result
kalshi

Casey O'Neill

View
100%
32%
Yes 100¢No 0¢
100¢
N/A
$500,664
N/A
N/A
$368,585
Settled
Yes
polymarket

Casey O'Neill vs. Eduarda Moura

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$139,706
N/A
N/A
N/A
Settled
Yes
polymarket

Ends before Round 3?

View
100%
72%
Yes 100¢No 0¢
1¢
N/A
$243
N/A
N/A
N/A
Settled
Yes
polymarket

Fight won by submission?

View
100%
81%
Yes 100¢No 0¢
3.9¢
N/A
$101
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 0.5 Rounds

View
100%
3%
Yes 100¢No 0¢
1¢
N/A
$10
N/A
N/A
N/A
Settled
Yes
polymarket

Ends before Round 2?

View
100%
84%
Yes 100¢No 0¢
5.9¢
N/A
$5
N/A
N/A
N/A
Settled
Yes
kalshi

Eduarda Moura

View
0%
32%
Yes 0¢No 100¢
100¢
N/A
$511,098
N/A
N/A
$454,723
Settled
No
polymarket

Fight to Go the Distance?

View
0%
63%
Yes 0¢No 100¢
—
N/A
$1,458
N/A
N/A
N/A
Settled
No
polymarket

O/U 2.5 Rounds

View
0%
67%
Yes 0¢No 100¢
—
N/A
$1,032
N/A
N/A
N/A
Settled
Yes
polymarket

O'Neill in Round 3

View
0%
7%
Yes 0¢No 100¢
—
N/A
$1,017
N/A
N/A
N/A
Settled
No
polymarket

O'Neill to win by KO/TKO?

View
0%
15%
Yes 0¢No 100¢
—
N/A
$581
N/A
N/A
N/A
Settled
No
polymarket

Fight won by KO/TKO?

View
0%
23%
Yes 0¢No 100¢
—
N/A
$100
N/A
N/A
N/A
Settled
No
polymarket

O'Neill in Round 2

View
0%
8%
Yes 0¢No 100¢
—
N/A
$23
N/A
N/A
N/A
Settled
No
polymarket

O/U 1.5 Rounds

View
0%
77%
Yes 0¢No 100¢
—
N/A
$18
N/A
N/A
N/A
Settled
Yes
polymarket

Moura to win by KO/TKO?

View
0%
5%
Yes 0¢No 100¢
—
N/A
$15
N/A
N/A
N/A
Settled
No
polymarket

Fight won by decision?

View
0%
68%
Yes 0¢No 100¢
—
N/A
$14
N/A
N/A
N/A
Settled
No
polymarket

O'Neill in Round 1

View
100%
91%
Yes 100¢No 0¢
19¢
N/A
N/A
N/A
N/A
N/A
Settled
Yes
polymarket

Moura in Round 1

View
0%
7%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
No
polymarket

Moura in Round 2

View
0%
5%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
No
polymarket

Moura in Round 3

View
0%
4%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
No
polymarket

Decision or Draw

View
0%
68%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
No
Total markets: 21

Description

This group covers various markets related to the UFC 331 fight between Casey O'Neill and Eduarda Moura, scheduled for September 19, 2026. Markets include who will win, how they will win (KO, submission, decision), round-based outcomes, and whether the fight will go the distance. All markets rely on official UFC information for resolution.

PredictionHero - Resolution Divergence Alerts (RDA)

Divergence Detected

Issue: Kalshi's winner market resolves to 'Yes' if *either* fighter wins, while Polymarket specifies a winner (Casey O'Neill or Eduarda Moura).Hero tip: Kalshi's market implicitly includes the possibility of a win by either fighter, making it more likely to resolve 'Yes' than Polymarket's market if a draw or no contest occurs.

Critical divergence points:

  • Polymarket: Resolves to the specific winner (Casey O'Neill or Eduarda Moura). '50-50' if draw, no contest, or postponed beyond Oct 3, 2026. Key Quote: "This market will resolve to 'Casey O'Neill' if Casey O'Neill is officially declared the winner..."
  • Kalshi: Resolves to 'Yes' if either fighter wins. Key Quote: "If Casey O'Neill wins...then the market resolves to Yes. If Eduarda Moura wins...then the market resolves to Yes."
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

This market will resolve to "Casey O'Neill" if Casey O'Neill is officially declared the winner of the fight against Eduarda Moura at UFC 331: Van vs. Pantoja 2, scheduled for September 19, 2026. It will resolve to "Eduarda Moura" if Eduarda Moura is officially declared the winner. If the fight is declared a draw or technical draw, ruled a No Contest, not scored, canceled, or postponed beyond October 3, 2026, this market will resolve "50-50." The resolution source for this market will be official information from the UFC.

Kalshi

If Casey O'Neill wins the O'Neill vs Moura professional MMA fight originally scheduled for Sep 19, 2026, then the market resolves to Yes. If Eduarda Moura wins the O'Neill vs Moura professional MMA fight originally scheduled for Sep 19, 2026, then the market resolves to Yes.