Key Highlights
- Combined lifetime trading volume for Kalshi and Polymarket surpassed $150 billion during April
- Kalshi achieved an all-time high of $14.81 billion in monthly volume, representing a 13.3% increase
- Polymarket experienced a 14.8% decline to $9.01 billion, expanding Kalshi’s monthly advantage to $5.8 billion
- Active users on Polymarket decreased from 733,000 in March to 643,000 in April
- Approximately 85% of Kalshi’s trading activity now stems from sports and “Exotics” parlay-style contracts
The prediction market landscape achieved a historic benchmark in April as Kalshi and Polymarket collectively surpassed $150 billion in lifetime trading volume. This achievement occurred despite the industry experiencing its first month-over-month contraction following seven consecutive months of unprecedented expansion.
The standout performer was Kalshi, which registered $14.81 billion in notional trading volume throughout April. This represented a 13.3% climb from its previous benchmark of $13.07 billion established in March.
The timing of this performance amplified its significance. April’s calendar lacked marquee events like the Super Bowl, March Madness tournament, or NFL playoff action. Instead, the month featured the commencement of NBA and NHL playoffs, The Masters golf championship, and baseball’s opening month.
The Masters tournament alone produced $545 million in notional volume on Kalshi — precisely matching the platform’s Super Bowl single-game volume of $545.1 million.
Meanwhile, Polymarket experienced contrasting momentum. Its notional volume contracted 14.8%, sliding from $10.57 billion in March to $9.01 billion in April. This widened Kalshi’s monthly advantage to $5.8 billion, more than doubling the $2.5 billion differential observed in March.
Sports Betting and Exotic Contracts Fuel Kalshi’s Momentum
Sports-related contracts represented 74.3% of Kalshi’s weekly trading volume during the week ending April 20. When factoring in Exotics — the platform’s innovative parlay-style combination contracts — that proportion climbed to approximately 85%.
Exotics contracts are experiencing rapid adoption. During the April 20 week, they generated $412.5 million, representing roughly 10.6% of Kalshi’s total weekly activity, compared to 8.7% the previous week.
Kalshi’s taker volume reached $5.42 billion in April versus Polymarket’s $1.99 billion. Additionally, Kalshi handled more individual transactions — 94.4 million compared to Polymarket’s 87.4 million — reversing a historical pattern where Polymarket traditionally dominated transaction volume.
Polymarket’s Diversified Approach Presents Trade-offs
Polymarket maintains a markedly different category distribution compared to Kalshi. During the April 20 week, sports markets commanded 46% of activity, while cryptocurrency markets captured 22% and political forecasting markets contributed 27%.
This diversified composition serves Polymarket well during periods of heightened crypto enthusiasm or significant political developments. However, when both sectors experience lulls — as occurred throughout portions of April — the platform lacks a concentrated sports foundation to maintain baseline activity.
Polymarket’s active participant count declined from over 733,000 in March to approximately 643,000 in April. This contraction indicates that some of March’s elevated engagement was attributable to March Madness, with April numbers reflecting more normalized user engagement.
Regarding regulatory developments, Polymarket is reportedly pursuing U.S. market access after acquiring a CFTC-licensed derivatives exchange for its international marketplace. Kalshi secured funding in March at a $22 billion valuation. Reports suggest Polymarket is pursuing capital at a $15 billion valuation.
Nine months prior, the prediction market sector was generating approximately $2 billion monthly. By April 2026, combined monthly volume across both platforms reached roughly $28 billion.
