TOTAL VOLUME:

$134.2b

24H VOL:

$126,324,530

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,434,646,834

406,019

Markets across

30,401

events

MATCHED EVENTS:

2,689

PLATFORM COVERAGE:

5

Polymarket:

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VS.

Kalshi:

61%

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UFC Fight Night: Arnold Allen vs. Melquizael Costa (Featherweight, Main Card)
polymarket

UFC Fight Night: Arnold Allen vs. Melquizael Costa (Featherweight, Main Card)

Volume:
$1,747,481

Arnold Allen vs. Melquizael Costa

 - Polymarket

Arnold Allen vs. Melquizael Costa - Polymarket

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved May 17, 2026

Closed: May 16, 11:59 PM EST

polymarket

Polymarket

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

Arnold Allen vs. Melquizael Costa

View
100%
Yes 100¢No 0¢
0.1¢
N/A
$1,704,157
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 4.5 Rounds

100%
Yes 100¢No 0¢
0.1¢
N/A
$33,025
N/A
N/A
N/A
Settled
Yes
polymarket

Fight to Go the Distance?

100%
Yes 100¢No 0¢
0.1¢
N/A
$4,025
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 1.5 Rounds

100%
Yes 100¢No 0¢
0.1¢
N/A
$285
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 3.5 Rounds

100%
Yes 100¢No 0¢
0.1¢
N/A
$180
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 0.5 Rounds

100%
Yes 100¢No 0¢
0.1¢
N/A
$101
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 2.5 Rounds

100%
Yes 100¢No 0¢
0.1¢
N/A
$56
N/A
N/A
N/A
Settled
Yes
polymarket

Costa to win by KO/TKO?

0%
Yes 0¢No 100¢
—
N/A
$4,716
N/A
N/A
N/A
Settled
No
polymarket

Allen to win by KO/TKO?

0%
Yes 0¢No 100¢
—
N/A
$432
N/A
N/A
N/A
Settled
No
polymarket

Fight won by KO/TKO?

0%
Yes 0¢No 100¢
—
N/A
$257
N/A
N/A
N/A
Settled
No
polymarket

Fight won by submission?

0%
Yes 0¢No 100¢
—
N/A
$248
N/A
N/A
N/A
Settled
No
Total markets: 11

Description

This market will resolve to "Arnold Allen" if Arnold Allen is officially declared the winner of the fight against Melquizael Costa at UFC Fight Night: Allen vs. Costa, scheduled for May 16, 2026. It will resolve to "Melquizael Costa" if Melquizael Costa 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 May 30, 2026, this market will resolve "50-50." The resolution source for this market will be official information from the UFC.