TOTAL VOLUME:

$134.2b

24H VOL:

$130,522,377

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,438,389,636

404,028

Markets across

30,214

events

MATCHED EVENTS:

2,681

PLATFORM COVERAGE:

5

Polymarket:

39%

VS.

Kalshi:

61%

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UFC Fight Night: Alvin Hines vs. RJ Harris (Heavyweight, Prelims)
polymarket
kalshi

Who will win the UFC Fight Night heavyweight bout between Alvin Hines and RJ Harris?

Volume:
$1,004,483

RJ Harris

 - Kalshi

RJ Harris - Kalshi

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved Jul 18, 2026

Closed: Jul 18, 5:54 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

RJ Harris

View
100%
Yes 100¢No 0¢
100¢
N/A
$531,468
N/A
N/A
$374,633
Settled
Yes
polymarket

Fight won by KO/TKO?

100%
Yes 100¢No 0¢
0.1¢
N/A
$623
N/A
N/A
N/A
Settled
Yes
polymarket

Harris to win by KO/TKO?

100%
Yes 100¢No 0¢
6.9¢
N/A
$593
N/A
N/A
N/A
Settled
Yes
kalshi

Alvin Hines

0%
Yes 0¢No 100¢
100¢
N/A
$402,575
N/A
N/A
$337,384
Settled
No
polymarket

Alvin Hines vs. RJ Harris

0%
Yes 0¢No 100¢
—
N/A
$64,103
N/A
N/A
N/A
Settled
Yes
polymarket

O/U 1.5 Rounds

0%
Yes 0¢No 100¢
—
N/A
$2,644
N/A
N/A
N/A
Settled
Yes
polymarket

Fight to Go the Distance?

0%
Yes 0¢No 100¢
—
N/A
$2,200
N/A
N/A
N/A
Settled
No
polymarket

Hines to win by KO/TKO?

0%
Yes 0¢No 100¢
—
N/A
$184
N/A
N/A
N/A
Settled
No
polymarket

O/U 2.5 Rounds

0%
Yes 0¢No 100¢
—
N/A
$45
N/A
N/A
N/A
Settled
Yes
polymarket

Fight won by submission?

0%
Yes 0¢No 100¢
—
N/A
$43
N/A
N/A
N/A
Settled
No
polymarket

O/U 0.5 Rounds

0%
Yes 0¢No 100¢
—
N/A
$5
N/A
N/A
N/A
Settled
Yes
Total markets: 11

Description

This event group covers a heavyweight preliminary fight between Alvin Hines and RJ Harris scheduled for UFC Fight Night: Du Plessis vs. Usman on July 18, 2026. Markets span fighter winner selection, method of victory (KO/TKO, submission, distance), and round duration thresholds. Resolution depends on official UFC fight outcome and timing data.

PredictionHero - Resolution Divergence Alerts (RDA)

Divergence Detected

Issue: Kalshi's binary outcome market lacks explicit edge-case resolution (draw, no contest, cancellation), while Polymarket's suite provides granular markets with consistent "50-50" fallback logic. Scope and detail differ significantly.Hero tip: Polymarket offers richer resolution framework with clear edge-case handling; Kalshi's single market is simpler but ambiguous on non-decisive outcomes. For comprehensive fight coverage, use Polymarket. For simple winner-pick exposure, Kalshi suffices but carries edge-case risk.

Critical divergence points:

  • Polymarket: Nine distinct markets covering winner, method (KO/TKO, submission), distance, and round duration. All markets include explicit "50-50" resolution for draw, no contest, no-score, cancellation, or postponement beyond Aug 1, 2026. Winner resolves to named fighter or "50-50"; method and distance markets resolve "Yes"/"No" or "50-50"; round markets resolve "Over"/"Under" or "50-50" at exact threshold. Key Quote: 'If the bout is ruled a No Contest, not scored, canceled, or postponed beyond August 1, 2026, this market will resolve 50-50.'
  • Kalshi: Single binary outcome market: resolves "Yes" if either Alvin Hines or RJ Harris wins. No explicit resolution logic for draws, no contests, cancellations, or postponements. Key Quote: 'If RJ Harris wins the Harris vs Hines professional MMA fight originally scheduled for Jul 18, 2026, then the market resolves to Yes. If Alvin Hines wins the Harris vs Hines professional MMA fight originally scheduled for Jul 18, 2026, 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 "Alvin Hines" if Alvin Hines is officially declared the winner of the fight against RJ Harris at UFC Fight Night: Du Plessis vs. Usman, scheduled for July 18, 2026. It will resolve to "RJ Harris" if RJ Harris 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 August 1, 2026, this market will resolve "50-50." The resolution source for this market will be official information from the UFC.

Kalshi

This event covers a professional MMA fight originally scheduled for July 18, 2026. If the fight is postponed or delayed, the market remains open and closes after the rescheduled fight concludes within two weeks. In the event of a tie or no contest, both fighter markets resolve to 50/50. If the fight is cancelled or rescheduled beyond two weeks, the market resolves to a fair price in accordance with applicable rules. The market is not endorsed by Zuffa LLC or the UFC.

Frequently asked questions

This dashboard aggregates prediction market contracts across Polymarket and Kalshi, tracking real-time odds on the Hines vs. Harris heavyweight fight. Traders on both venues are pricing outcomes including fight duration and winner probability. The cross-platform view lets you compare how each community is valuing the same event, revealing where consensus is strongest and where disagreement exists. Total volume across both platforms reflects the combined interest in this preliminary bout. Whether you're interested in the fight going the distance or a decisive finish, this aggregated feed captures the evolving market sentiment as fight day approaches.

Prediction markets and sportsbooks price odds differently because they operate on distinct mechanisms. Sportsbooks set lines to balance action and lock in profit margins, while prediction markets let traders themselves determine prices through supply and demand. This market reflects what thousands of independent traders believe will happen, often incorporating real-time information faster than traditional sportsbooks adjust their lines. Prediction market prices tend to be more efficient at pricing niche or preliminary events where sportsbook liquidity is thin. Comparing this market's odds to your preferred sportsbook can reveal value opportunities, especially on undercard fights with less mainstream attention.

Fighter news is the primary catalyst: injuries, weight-cut issues, or withdrawal announcements would trigger sharp repricing. Training camp updates, coaching changes, or public statements from either fighter can shift trader sentiment. Weigh-in results and official fighter confirmations typically cause late-stage volatility. Comparative fighter performance data—recent fight footage, strength metrics, or head-to-head records—may surface new information that adjusts odds. Media coverage and expert commentary can also influence retail trader positioning. Finally, any UFC schedule adjustments or venue changes could impact market dynamics as the event date approaches.