Polymarket $3B Monthly Volume, Sports Deals Challenge Kalshi

Polymarket reached its highest monthly trading volume in October 2025, at over $3 billion, representing a 110% increase compared to September’s $1.427 billion.

This growth was driven by the prediction market platform expanding its strategic partnerships and quietly launching beta testin g for its US exchange.

UFC Partnership Brings Real-Time Fan Prediction Integration

TKO Group Holdings and Polymarket announced a comprehensive, multi-year partnership on November 13, establishing UFC and Zuffa Boxing as the first sports organizations to integrate prediction market technology directly into the live fan experience.

The platform became the Official and Exclusive Prediction Market Partner of UFC.

The agreement positioned Polymarket to power the first-ever real-time Fan Prediction Scoreboard within UFC broadcasts.

The proposal is to offer a dynamic layer of storytelling that visualizes how fans worldwide forecast each fight as it unfolds and transforms fan sentiment into a visible, data-driven narrative, measuring the unofficial pulse of the audience in real-time for every UFC event.

TKO Executive Chair and CEO Ariel Emanuel stated that partnering with Polymarket unlocked a new dimension of fan engagement by integrating the platform with UFC and Zuffa Boxing live experiences.

He added that the partnership will enable fans to interact with events in real-time, transforming passive viewership into active participation.

Polymarket will strategically activate its brand across UFC premium assets, including live events, broadcasts, and social media content, while also collaborating on a custom social series entitled “Matchup Predictions – Who’s Next?”

The platform will serve as the first official brand partner of Zuffa Boxing, the new professional boxing promotion launching in January 2026, bringing its fan engagement experiences to Zuffa Boxing events with arena activations and custom digital content.

Silent US Exchange Testing Moves Forward

Polymarket founder Shayne Coplan revealed at Cantor Fitzgerald’s Crypto & AI Infrastructure Conference in Miami on November 13 that the platform’s US exchange was live and operational.

However, only select users are placing bets on real contracts as the company moves to complete the final steps needed to open up.

Coplan confirmed that the exchange was fully functional and people were being onboarded, effectively constituting a beta test.

The development represented a critical milestone for Polymarket, as the platform worked to re-enter the US market after previously operating offshore.

The silent testing phase allowed the company to validate its infrastructure and compliance frameworks before a broader public launch.

NHL and Yahoo Finance Partnerships Expand Reach

The National Hockey League announced on October 22 that Polymarket became an official prediction market partner, alongside Kalshi, in a landmark multi-year US agreement.

This partnership provides both platforms with access to official NHL proprietary data and grants them the rights to use NHL marks and logos on their platforms and products.

The partnership secured brand exposure through digitally enhanced dashboards and blue line slot virtual signage on NHL game broadcasts, including regular-season national games, Stanley Cup Playoffs games, and NHL Winter Classic broadcasts.

Polymarket announced on November 12 that it became the exclusive prediction market partner for Yahoo Finance.

The financial media platform is launching a new prediction markets hub, powered exclusively by Polymarket, that will display probability data for key economic, government, and market outcomes, paired with related news, quotes, and analysis from Yahoo Finance and its partners.

Trading Volume Surge Despite Kalshi Dominance

Polymarket’s October 2025 volume marked the first time the platform surpassed $3 billion in a month, exceeding the previous record of nearly $2.6 billion set in November 2024, during the US presidential election.

Additionally, the platform recorded its highest numbers of monthly active traders at 471,649 and the highest count of monthly new accounts at 440,460 users.

The numbers represented a reversal of a downtrend that started in January 2025, with volumes, active traders, and new traders slowly declining on a monthly basis until August, when the numbers began to recover.

However, Kalshi maintained its dominance by registering nearly $4.4 billion in October, after showing $2.86 billion in September.

As of November 13, Kalshi led monthly volumes with $2.3 billion, compared to Polymarket’s approximately $1.3 billion.

Despite Polymarket achieving a higher percentage growth, Kalshi’s absolute numbers remained superior, making it the market leader in regulated prediction markets.

The combination of record trading volumes, major sports partnerships, exclusive media deals, and the silent US market testing positioned Polymarket to challenge Kalshi’s dominance as prediction markets continue their rapid evolution towards mainstream adoption.