Prediction Markets Can See the Future. Their Problem Is Who Saw It First.
The entire value of a prediction market comes from people who know things — and its entire legitimacy now depends on punishing some of them for it. That contradiction stopped being theoretical this week, when Kalshi announced a multi-year partnership with Nasdaq Market Surveillance to monitor its markets for manipulation and insider trading, importing Wall Street's immune system into an industry whose founding pitch was that it had evolved past Wall Street.
Prediction markets are having their best year ever and their most embarrassing one, simultaneously. Both facts flow from the same source.
A congressman, a teleprompter, and a $35,000 fine
Start with the embarrassments, because they explain the timing. Last month the CFTC fined former Representative George Santos $35,000 over alleged manipulative trading on Kalshi — a penalty notable less for its size than for its subject, a man whose career already functioned as a stress test for every institution he touched.
The stranger case is still open. Reuters reported that a White House teleprompter operator is under investigation for potential insider trading on the platform. Sit with the mechanics of that one. A person whose job is to display the words a president will say, minutes before he says them, allegedly monetized the gap. No stock exchange has ever had to contemplate front-running a speech. The nearest precedent is a wire-service leak, and even that analogy collapses on inspection — the teleprompter is not a leak, it is the source itself.
Bloomberg has chronicled a new class of traders who simply knew the future before the market did — congressional staffers, campaign aides, sports insiders, people adjacent to announcements. Some of them are the scandal. And some of them, awkwardly, are the reason the prices were right.
Inside information is not a bug in this machine
Here is the part the industry's defenders whisper and its critics refuse to hear: prediction markets are accurate precisely because informed people trade on what they know. That is the mechanism. There is no other one. A market on "Will the Fed cut in September?" beats a poll of pundits because somewhere in the order book, people with real knowledge — economists, traders, insiders of varying legality — are betting their conviction.
Equities resolved this tension with a legal construction: insiders owe a fiduciary duty to shareholders, so trading on material nonpublic information is theft from them. The scaffolding is old, litigated, and reasonably clear.
Event contracts have no shareholders to steal from. If a Senate scheduler bets that a vote will slip, who exactly is the victim? The counterparty took a position voluntarily in a market whose stated purpose is aggregating dispersed information. Some scholars argue such trades make the market better — the price updates sooner, and the public learns the truth faster. The CFTC's event-contract rules prohibit trading on certain confidential information, but the doctrine is a fraction of the age and depth of securities law, and every enforcement action is partly an improvisation.
The enforcement mechanics get harder from there. Stock-market surveillance leans on a chokepoint: brokers know their customers, and exchanges know their brokers. Event markets attract a wider cast — a bettor tipped by a cousin on a campaign bus, a group chat pooling gossip into a shared wallet, a foreign trader far outside any subpoena's reach. Information launders through networks of tippers faster than attribution can follow it, and the tipper who never trades is nearly invisible to any system built to watch order flow.
So the industry faces a line-drawing exercise with no settled principle. A weather modeler betting on hurricane markets: fine, obviously — that is expertise. A hospital worker betting on a public figure's health announcement: obviously not. A staffer who knows a bill is dead betting against its passage: which side of the line? The honest answer is that nobody has one yet.
Kalshi is buying Wall Street's immune system off the shelf
Against that backdrop, Kalshi's response is revealing. The Nasdaq deal will roll out round-the-clock monitoring for market abuse across its event contracts and perpetual-style derivatives in phases. It arrives on top of an independent surveillance audit committee, a partnership with Solidus Labs and Wharton forensic-analytics director Daniel Taylor, a new head of enforcement, and a deal with Comply to monitor its own employees' trades.
That is not a startup's compliance program. It is a stock exchange's. Which is the point — and the tell.
There is also a quieter behavioral wager buried in the announcement. Surveillance does most of its work before any case is filed: the staffer who might have placed a five-figure bet on a nonpublic vote count thinks twice once every order is scored by the same systems that flag suspicious equity trades. Deterrence, not detection, is what Kalshi is really purchasing — the credible threat that the anomaly will be seen. Whether that chills the illegal trades or merely the informed ones is the experiment now running live.
Kalshi is not doing this defensively. It closed May with $17.91 billion in monthly notional volume, its ninth consecutive record, and holds roughly 73% of tracked prediction-market share against Polymarket's 27%. Volume like that attracts institutions, and institutions do not connect to venues that cannot prove their tape is clean. Surveillance is not a cost center here. It is a sales document.
The competitive shape of the market makes the logic sharper. Polymarket — down 21% from its March volume peak — has been converting its own credibility, acquiring QCX and QC Clearing for a regulated U.S. path and reportedly raising at a valuation above $20 billion. Two firms that once postured as gambling's punk rock are now competing on who can look more like the NYSE.
The crypto industry should recognize this movie
Crypto watched this exact film with exchanges. The venues that won — Coinbase, and eventually even the offshore giants — won by absorbing the compliance apparatus they were founded to escape. The ones that treated surveillance as a betrayal of the ethos are bankrupt, indicted, or both.
Prediction markets are speedrunning the same arc, with one difference that deserves more attention: the blockchain-based versions leave their evidence in public. Polymarket's order flow settles onchain, where researchers and journalists reconstructed suspicious trades without subpoenas. Bloomberg's insider analysis was possible because the ledger was open. Kalshi, a centralized CFTC exchange, must pay Nasdaq to see what Polymarket's chain shows anyone for free.
That is a quietly strong argument for the crypto rails — transparency as surveillance infrastructure, rather than surveillance as a paid service. It cuts against the assumption that regulation favors the centralized model. An open ledger is the cheapest audit trail ever built, even if today's regulators do not yet price it that way. Anyone who tracked the relevant markets on a portfolio app like The Crypto App could watch the same odds move in real time that investigators later flagged; the information asymmetry was in who knew why, never in who could see what.
Concede the other side its due: public ledgers also make copy-trading insiders trivial, and pseudonymous wallets complicate attribution in ways Nasdaq's systems never face. Transparency identifies the trade, not the trader. A serious enforcement regime needs both, which is why Polymarket bought a clearinghouse instead of arguing the chain was enough.
Where the line finally gets drawn
The unresolved question is not whether prediction markets will be regulated — that argument ended when the volume showed up. It is whether regulators will write an insider-trading doctrine for event contracts that preserves the reason these markets exist. Ban informed trading too aggressively and the prices decay into vibes with extra steps; the product dies of purity. Tolerate it too openly and every market becomes a honeypot for staffers with nonpublic calendars; the product dies of rot.
Securities law took half a century, a few crises, and a Supreme Court case or three to find its balance. Event markets will get maybe three years, in a political environment where a sitting congressman has already been fined and a White House employee is under investigation. The pressure to legislate quickly, and badly, will be enormous.
Watch one number through all of it: Kalshi's monthly volume. If the records keep falling while the surveillance tightens, the industry will have proven that clean markets and accurate markets can be the same thing. If volume stalls as the monitoring bites, we will learn something more uncomfortable — that a meaningful share of the liquidity was the inside information, and the oracle only spoke clearly because someone in the room already knew the answer.
Either result rewrites how much trust the future's prices deserve. The markets that claim to see tomorrow are about to find out how much of their vision was borrowed from people who had already read the script.