Polymarket trading volume falls for first time in eight months
Prediction market Polymarket has recorded its first monthly decline in trading volume since August, with technical issues and growing competition with rival Kalshi blamed for the fall.
Trading volume across Polymarket’s offshore exchange and US app fell by around 9% to US$10.3 billion in April, according to figures published by Dune Analytics.
Over the same period, Kalshi’s trading volume climbed 13% to US$14.8 billion, enabling it to extend its lead in the prediction market sector, after passing Polymarket last year.
Polymarket’s previous growth had been fueled by major sporting events, including the NFL season and the March Madness college basketball tournament, which helped the platform reach a record volume in March.
According to Bloomberg, in a statement on Wednesday the company blamed April’s slowdown on a delayed infrastructure upgrade aimed at improving transaction speeds and reducing technical failures.
Polymarket Founder Shayne Coplan recently acknowledged operational challenges as the company expanded, saying management and communication had been “suboptimal” at times. Meanwhile, Vice President of Engineering, Josh Stevens, admitted users had been frustrated by outages and failed transactions.
Despite the decline in activity, Polymarket’s valuation has continued to rise alongside broader growth in the prediction market industry.
The company was recently valued at US$15 billion following a US$600 million investment from New York Stock Exchange parent Intercontinental Exchange, following the group’s initial US$2 billion investment in October.
Charlotte Capewell brings her passion for storytelling and expertise in writing, researching, and the gambling industry to every article she writes. Her specialties include the US gambling industry, regulator legislation, igaming, and more.
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The Backstory
From surge to stumble
Polymarket’s first monthly dip in trading activity since late summer follows an eight-month run fueled by sports calendars and constant headline risk. The skid in April came as the platform worked through delayed infrastructure upgrades that slowed transactions and spurred outages, handing rival Kalshi more room to scale. The setback arrived just as the sector’s center of gravity has been shifting toward regulated event contracts in the United States and deeper institutional participation, a lane where Kalshi has built momentum.
The rivalry has been tightening across several fronts. In November, both platforms set new highs as retail traders piled in around elections, economic prints and sports, with analysts describing an emerging duopoly in event-driven speculation. That month’s combined record was documented in reporting that showed Kalshi and Polymarket hit record $10 billion trading volume for November, reflecting how news cycles and broader integrations can quickly swing activity.
How Kalshi seized the lead
Kalshi has capitalized on its regulatory head start and a fast-building product roadmap. It is registered in the U.S. and has operated under oversight since 2020, a foundation it used to court retail and professional flow while broadening market listings. In recent months, the company laid out aggressive expansion plans for broker connectivity and new risk products while announcing a major capital raise. The latest round, which lifted Kalshi’s valuation to $22 billion, was paired with extraordinary volume gains and a bid to bring in hedge funds, asset managers and prop firms, as detailed in Kalshi hits $22 billion valuation as trading volume rises 800% in six months.
The cumulative effect has shifted market share. After years of Polymarket dominance, Kalshi overtakes Polymarket in global trading volume charted how operational hiccups and U.S. market constraints weighed on Polymarket while Kalshi pressed its advantage. The analysis pointed to a series of Polymarket delays — a system restart that stretched well past plan and a deferred infrastructure upgrade — alongside a slow relaunch in the U.S. following a multi-year pause tied to Commodity Futures Trading Commission action. The contrast has been stark: Kalshi leaned into its regulated status, while Polymarket’s U.S. app remained in beta even after securing marquee sports branding.
Polymarket’s bid to diversify demand
Even as it wrestled with throughput and reliability, Polymarket chased new sources of traffic and time-on-platform. Partnerships in media and live sports streaming aim to embed prediction markets where audiences already engage. In January, the company moved to knit trading directly into broadcasts, with DAZN collaborates with Polymarket to add prediction trading features to its live streams outlining a plan to surface real-time odds and let viewers trade alongside live events. DAZN said it would pursue the necessary U.S. licenses with the CFTC to enable trading stateside, signaling an intent to treat event contracts as a feature inside the viewing experience rather than a separate destination.
Polymarket has also pursued integrations with major web platforms and sports leagues to increase mainstream visibility. Past growth spurts aligned with the NFL season and March Madness, underscoring how concentrated event calendars can power volume — and how gaps between tentpoles can leave platforms exposed if technical issues persist. The company’s collaboration strategy is designed to smooth those peaks and troughs by locking in distribution and utility beyond single events.
Regulatory overhang and operational strain
The path back into the U.S. has been complicated for Polymarket. Its expansion was stalled for three years until late 2025 following CFTC allegations it ran an unlicensed market. While it has since regained a toehold, its American platform has rolled out cautiously, a factor that has limited scale relative to a fully regulated competitor. Reporting in Kalshi overtakes Polymarket in global trading volume linked these regulatory and operational frictions to lost share just as Kalshi’s listings and liquidity deepened.
The firm has acknowledged management and communication lapses during rapid expansion, while engineering leaders have pointed to the frustrations caused by outages and failed transactions. Those stress points matter more as volumes swell and market participants expect execution quality on par with traditional venues. In that respect, the April decline is less an anomaly than a reminder that scaling on-chain market infrastructure requires redundancy, predictable maintenance windows and clear user messaging to avoid confidence shocks.
Trust, transparency and market integrity
To bolster credibility, Polymarket has leaned into the transparency of blockchain settlement and added new compliance guardrails. In March, both major platforms tightened insider trading rules. Polymarket followed by bringing in Chainalysis to harden surveillance and investigative workflows. As laid out in Polymarket partners with Chainalysis on insider trading detection, the collaboration introduces detection models to flag suspicious patterns and trains staff on enforcement. The pitch is that on-chain auditability, married with professional monitoring, can exceed the visibility of legacy markets and reassure retail and institutional users wary of opaque odds or privileged information.
Market integrity is not a side issue. Event contracts straddle finance, news and politics, and they are increasingly used to read consensus on elections, macro data and geopolitical risk. The November milestone — captured in record monthly trading for Kalshi and Polymarket — was driven in part by that role as a real-time sentiment barometer. Sustaining that function depends on trader confidence that markets are fair, resilient and fast.
What April’s dip signals
The first retrenchment after months of expansion is a marker of intensifying competition and execution risk. Kalshi’s capital, compliance posture and product pipeline position it to keep pressing gains, especially with planned institutional onboarding detailed in its latest funding disclosure. Polymarket’s counter is a mix of infrastructure upgrades, distribution deals like DAZN’s streaming integration, and integrity initiatives via Chainalysis, set against a slowly normalizing U.S. footprint.
The stakes are clear. If prediction markets continue to migrate from niche retail venues into mainstream finance and media, reliability and regulatory clarity will determine who captures the next wave of flow. April’s slowdown underscored that user tolerance for glitches is low when alternatives are liquid, regulated and well-funded. The next few quarters — packed with election season catalysts, economic surprises and sports championships — will test whose infrastructure and distribution can convert attention into durable market share.
