TLDR
Major prediction platforms like Polymarket and Kalshi are tightening integrity rules just as event?betting volumes hit record levels and regulators move in.
- Polymarket and Kalshi have introduced detailed bans on insider trading and manipulation, with preemptive blocks for people who can influence outcomes.
- Combined monthly volumes have reached around $18.6 billion, with sports contracts driving a large share and helping attract institutional and mainstream partners.
- Lawmakers and the CFTC are now defining what prediction markets can list, especially for sports, war and death markets, which could reshape what users can trade.
Deep Dive
1. What Rules Are Changing
Polymarket has published enhanced Market Integrity Rules that apply both to its Polygon?based DeFi platform and its CFTC?regulated U.S. exchange, explicitly banning three types of insider trading plus spoofing, wash trading, front?running and similar manipulation, backed by multi?layer surveillance and National Futures Association oversight on the U.S. side. These rules are laid out in new integrity pages and an updated rulebook for both venues, with clear reporting channels for suspicious activity and sanctions ranging from wallet bans to regulatory referrals.
Rival Kalshi is going beyond generic no insider trading language by preemptively blocking athletes, coaches, officials and political candidates from trading markets tied to their own sports or campaigns, using screening partners and whistleblower tools to stop these trades before they hit the book. Recent controversies, such as coordinated Iran?related trades on Polymarket and high?profile enforcement actions against individual users, have increased pressure to show serious controls.
Expect more surveillance, eligibility checks and fewer gray area markets, but also a somewhat fairer playing field for regular traders.
2. Volumes Are Exploding
Regulated prediction markets are not tiny side shows anymore. Reports put combined monthly volume on Polymarket and Kalshi at about $18.6 billion in February 2026, with more than $8 billion traded in the first half of March alone as activity spikes ahead of major political and sports events. Sports contracts are especially important, recently accounting for roughly $1.2 billion in weekly notional volume on Polymarket and $2.6 billion on Kalshi.
This growth is attracting institutions and mainstream partners. Polymarket has raised large funding rounds at multi?billion?dollar valuations and signed an integrity?focused deal with Major League Baseball, while banks and trading firms start integrating these markets into compliance frameworks and data pipelines. For crypto users, that means deeper liquidity on on?chain venues but also a drift toward traditional market standards.
Prediction markets are evolving into real financial infrastructure, which can support bigger positions but reduces the wild west character many early users were used to.
3. Regulatory Clamp Is The Wildcard
Regulators are now trying to draw bright lines. A bipartisan Prediction Markets Are Gambling Act in the U.S. Senate would bar CFTC?registered venues such as Polymarket and Kalshi from listing sports and casino?style contracts, while a separate DEATH BETS Act targets markets on war, terrorism, assassinations and individual deaths. At the same time, the CFTC has issued guidance classifying event contracts as a financial asset class and launched a rulemaking process on how the Commodity Exchange Act should apply.
States are pushing back too, with cases like Nevadas temporary ban on Kalshis sports and election markets and criminal charges in Arizona over unlicensed gambling. If federal rules tighten and these bills advance, regulated platforms may have to remove some of their highest?volume products or push them offshore, while DeFi?only markets risk being painted as unregulated gambling.
Users should expect contract menus to shift, especially around sports and geopolitical events, and watch how regulators distinguish useful information markets from plain betting.
Conclusion
Prediction markets are being forced to grow up fast, pairing record on?chain and regulated volumes with stricter integrity rules and heavy regulatory scrutiny. For crypto users, that creates a trade?off between deeper, more credible markets and a narrower, more heavily policed set of things you can actually trade. How lawmakers and the CFTC choose to draw those boundaries will largely determine whether prediction markets become a mainstream financial primitive or fragment back into small, offshore DeFi niches.
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