A strange trading pattern on Kalshi just got a lot of attention, and it started with a kalshi wash trading bot quietly running for almost two months on a market nobody expected to matter. The market in question asked whether Zohran Mamdani would become the 2028 Democratic presidential nominee. There was just one problem: Mamdani was not born in the United States, so he cannot legally hold that office. That detail made the bot’s behavior look even stranger once traders noticed it.
What the bot was actually doing
Between August 1 and September 19, 2026, something kept buying shares in the Mamdani market at two-tenths of a cent and selling them at one-tenth of a cent. It did this every two to four seconds, day after day, for weeks. Prediction-market analysts described the rhythm as mechanical, almost like a metronome.
The trades were tiny, around one dollar each. But repeated thousands of times, they added up to roughly $2 million in notional volume on a market that had no real reason to be active. Once the pattern was flagged publicly, the activity stopped.
How this connects to the bigger Ether perpetuals story
The bot did not surface in isolation. It came up right after a separate controversy over Kalshi’s Ether perpetual futures market, one of the newer crypto products the exchange has rolled out this year. A pseudonymous quant analyst who goes by Beni pointed out that Kalshi’s 24-hour Ether perpetual volume hit $539 million, while open interest sat at only $3.1 million. That is a large gap, and it is the kind of gap traders usually treat as a red flag for wash trading, where a firm effectively trades with itself to inflate reported volume.
Beni also flagged that trades sized at exactly $5,500 made up as much as 58% of Kalshi’s Ether perpetual volume across four separate days, according to a Wall Street Journal analysis that put the total notional volume from those uniform trades above $5 billion over a single month. Once traders started digging through Kalshi’s other markets for similar patterns, the Mamdani bot turned up as another example of oddly uniform, repetitive activity.
Kalshi’s response
Kalshi pushed back hard. In a post addressing the allegations directly, the exchange said wash trading is “banned in our rulebook” and that it “mechanically blocks self-trades” while running surveillance for pre-arranged trading between partners. Kalshi’s explanation for the repeated $5,500 trades is its liquidity-provider program: market makers get paid flat fees, in one example cited as $100,000 a month, for keeping resting buy and sell orders of a fixed size on the book. Different takers filling those same-sized orders over and over would naturally produce a cluster of identical trade sizes without any collusion involved.
Kalshi also pointed to profits made by faster traders against its market makers, roughly $98,000 in one instance, as evidence that both sides of these trades genuinely wanted the position rather than just recycling volume between related accounts.
The Mamdani bot is a harder case to explain the same way, since a market with essentially zero chance of resolving “yes” should not attract serious liquidity-provider incentives. Some observers have floated a simpler explanation: a developer testing an automated strategy, or a bot farming trading volume to unlock higher API rate limits, rather than anything tied to price discovery.
Where regulators stand right now
The Commodity Futures Trading Commission is reviewing the trading data around Kalshi’s Ether perpetual market, according to reporting cited across multiple outlets. Kalshi has said publicly that it has not been contacted by the agency and does not believe a formal investigation has been opened. That distinction matters. A review of public data is routine and does not by itself imply wrongdoing, while a formal investigation carries subpoena power and a much longer timeline.
Traders sizing up Kalshi’s newer crypto perpetual products should treat headline volume numbers with some caution until this gets sorted out. Volume-to-open-interest ratios that look unusually high are worth checking against a market’s actual liquidity before treating them as a sign of genuine demand. For readers who want the mechanics behind how these prediction-market products actually price and resolve trades, our guide to reading leaderboards and judging a market covers similar red flags to watch for when evaluating unusually active wallets or accounts.
Why this matters beyond one odd market
Kalshi has spent much of 2026 racing to add products, crypto perpetuals, gold and silver futures, and now filings for single-stock perpetuals and margin trading, while fighting a wave of state lawsuits over its sports contracts. Every new product adds another surface where trading patterns can look strange to outside observers, and this episode shows how quickly a single weird chart can turn into a public dispute over a platform’s integrity.
Kalshi and Polymarket have both leaned on trading volume as a headline metric when talking to the press and to potential partners. If that number can be inflated, deliberately or through an incentive structure nobody anticipated, it undermines a stat both platforms use to argue they are the bigger, more trusted venue. We’ve covered Kalshi’s push into margin trading as part of the same broader effort to court more sophisticated traders, and volume integrity questions like this one will likely follow the exchange into that next phase too.
For now, the Mamdani bot is quiet, Kalshi maintains its Ether perpetual numbers are legitimate, and the CFTC has not confirmed anything beyond a routine look at the data. Anyone trading on either platform’s newer derivative products should keep an eye on whether more bots or trade clusters like this one surface elsewhere before drawing firm conclusions about how clean the reported volume really is.
