The prediction market sector has reached a new milestone, with open interest hitting an all-time high of $1.3 billion in April 2026, according to data from Artemis. This represents a significant increase from $993.5 million in March, driven primarily by Kalshi and Polymarket. Kalshi leads with $636.4 million in open interest and posted a record $13.4 billion in spot volume for April, up 12.6% from March. Polymarket follows closely with $589.8 million in open interest, though its monthly volume dipped to $9.5 billion from $10.6 billion. The remaining platforms collectively account for less than $25 million in open interest.
Despite this growth, the industry is facing intense scrutiny from lawmakers, regulators, and law enforcement. The U.S. Senate voted unanimously to ban its members from trading on prediction markets, while the Department of Justice indicted a U.S. Army Special Forces soldier for allegedly using classified information to place bets on Polymarket, reportedly profiting around $410,000. At the state level, a Nevada judge ordered Kalshi to geofence its services, blocking residents from accessing sports, election, and entertainment contracts, labeling the platform's offerings as indistinguishable from sports betting. Minnesota legislators are advancing a bill that would make hosting prediction markets a felony.
Analysts also highlight a stark wealth disparity, with a Wall Street Journal analysis revealing that 67% of all Polymarket profits flow to just 0.1% of accounts, meaning fewer than 2,000 users capture nearly $500 million. Bloomberg's review found over 100,000 accounts lost at least $1,000, nearly double the number that posted comparable gains. Despite these risks, institutional backing remains strong: Kalshi's valuation adjusted to $22 billion, Polymarket raised $600 million backed by Intercontinental Exchange (owner of the NYSE), and Hyperliquid proposed adding prediction markets to its decentralized exchange.
In a separate but related development, blockchain investigator ZachXBT flagged a fraudulent prediction market product called PolyArb, warning it contains a wallet drainer designed to steal funds from users connecting their wallets. Security researcher bbsz described the operation as a long-running effort built to appear credible, not a typical hit-and-run scam. Legitimate platforms like Polymarket, Kalshi, and Hyperliquid continue to operate and attract users, with Hyperliquid processing 6.05 million contracts on its first day and setting a record of 2,441 new wallets on May 3.
