CME and Kalshi trade insults as prediction-market rules become a federal-state fight

A CFTC roundtable in Washington on Thursday turned into an open argument between CME Group Chairman Terry Duffy and Kalshi co-founder Luana Lopes Lara over manipulation and regulatory treatment of event contracts ^[1]. That matters less for the theatre than for the structural question underneath it: whether prediction markets are supervised as derivatives exchanges under federal law or as gambling under state law ^[9].

Duffy, whose company runs the world's largest futures exchange by volume ^[14], said he was "a lot concerned" about prediction markets and argued some contracts are susceptible to manipulation ^[2]. "We're not a bunch of carnival barkers at a circus," he said, adding that US markets are "the most envious markets in the world" ^[3]. He then mocked a Kalshi listing on the Nathan's hot dog eating contest as an example of economic significance ^[7], and asked why Kalshi could offer a compute prediction market while CME's proposed compute contracts remained under review ^[8].

That last complaint is the only part of Duffy's case with real operating consequence. It is a parity argument: same product, different queue. Lara's reply went at CME's own record, asking whether the exchange had "ever had any issues with any market manipulation" ^[4]. Duffy answered that he has more people in his regulatory department than Kalshi has in its whole company ^[5]. Lara suggested he "learn a bit about efficiency"; Duffy suggested she "learn about credible markets", at which point moderator Walt Lukken intervened ^[6]. Lara's substantive point was that every market and every exchange, onshore and offshore, has had problems, and that regulation exists to find and address them ^[12]. DraftKings CEO Jason Robins later asked participants to stop taking shots at each other's business models on the grounds that it does not advance the discussion ^[13].

Strip out the insults and the incumbent position is straightforward. CME wants event contracts held to the surveillance, listing and settlement standards it already carries, which would raise the cost of running a Kalshi-style venue. Kalshi wants the standards applied without a moratorium on new categories. Both sides are arguing to a regulator that has already picked a side on jurisdiction: CFTC Chair Selig defended federal authority over prediction markets, warned challenging states in February that "we will see you in court", and the agency has since taken legal action against states trying to regulate event contracts under gambling law ^[10].

The federal claim to jurisdiction is not the same as a permissive one. In June the CFTC proposed restrictions on certain contracts involving war or assassination, and on some sports proposition bets considered particularly susceptible to manipulation ^[11]. Earlier this month, nine Democratic senators pressed Selig to prohibit a further category of contracts ^[16]. So the fight runs on at least three fronts at once: state courts, CFTC rulemaking, and congressional pressure ^[17].

The mechanics keep this simple to police in principle. Event contracts settle at $1, so the price is the implied probability ^[15], which makes settlement sources and thin books the obvious attack surface.

Watch whether the CFTC's June proposal is finalised as drafted, whether CME's compute contracts clear review, and how the agency's suits against state regulators land.