BitMEX had one of the strangest days in its 11-year history on Thursday. In the morning, the exchange that invented the perpetual swap told users it was shutting down for good. By the evening, it had been sued in Manhattan federal court by customers alleging it had spent years rigging the very mechanism it is about to use on everyone still holding a position: liquidation.
The lawsuit, BKX Services Inc. et al. v. HDR Global Trading Limited et al., was submitted to the U.S. District Court for the Southern District of New York (SDNY). Filed by BKX Services Inc. and David Namdar, the complaint alleges that plaintiffs collectively lost 622.66 BTC due to predatory liquidation practices.
What the $60M+ suit alleges
Rather than claiming individual trade errors, the class action targets the architectural design of BitMEX’s trading engine and internal market-making desk.
According to court filings:
- Privileged Internal Access: Plaintiffs claim BitMEX’s internal trading desk held access to confidential order-book data and continued executing orders during platform “server freezes,” when public retail users were locked out.
- Premature Liquidations: The suit claims positions were force-liquidated even when remaining collateral values were double the required margin threshold, with excess Bitcoin routed into the platform’s insurance fund.
- Class Scope: The suit seeks compensatory and punitive damages on behalf of U.S. customers who traded BTC swap products on BitMEX dating back to July 23, 2018.
The shutdown, and its own liquidations
Hours earlier, BitMEX had delivered very different news. In a message to users, the exchange said it would cease operations at 04:00 UTC on September 23, 2026, after the board of HDR Global Trading Limited decided to close following a strategic review of the business and the broader crypto industry. New account registrations halted immediately. The company did not cite financial distress or regulatory action. The announcement caused BitMEX’s native BMEX utility token to plunge by nearly 90% within hours.
The wind-down is phased, and it runs on forced closures. BitMEX has said all staked BMEX tokens were unstaked and returned to user wallets for immediate withdrawal. Users who completed KYC but fail to withdraw face a maintenance fee, reported as the greater of $50 per month or roughly 1% annually on remaining balances, escalating if funds go unclaimed.
Crucially, the exchange stated that users are on notice it may force-close positions at its sole discretion, and that it takes no responsibility for trading losses that result.
The overlap nobody planned
Read those two developments together and the tension is obvious. An exchange facing allegations that it engineered liquidations to seize customer Bitcoin is now preparing to conduct the largest forced liquidation in its own history, by design, on a published schedule, with an explicit disclaimer of liability for the losses it produces.
There is nothing improper about that on its face. A wind-down has to end with positions closed, and announcing the mechanism two months in advance with a phased ramp is a more orderly approach than many collapsing platforms have managed. Users have been given a long runway, and BitMEX’s stated position is that assets remain fully safe and under user control throughout.
But the sequencing creates a genuine problem for traders. Anyone holding open positions now faces a countdown in which the party executing the closures is simultaneously defending a lawsuit about how it executes closures. For anyone who believes they were wrongly liquidated in the past, the practical advice is the same as the exchange’s own: close positions and withdraw well before the deadlines, rather than leaving the timing to the platform.
A company with legal history
This is not BitMEX’s first encounter with US federal courts. In 2020, prosecutors in the Southern District of New York, the same court now hearing this case, charged co-founders Arthur Hayes, Ben Delo, and Samuel Reed, along with executive Gregory Dwyer, with violating the Bank Secrecy Act by failing to maintain an adequate anti-money-laundering program while serving US customers. All four eventually pleaded guilty and received sentences involving probation and fines, and HDR Global Trading paid a $100 million penalty in a related resolution.
That chapter formally closed in March 2025, when President Trump pardoned the co-founders of BitMEX as part of a series of clemency grants to crypto figures. The legal slate was wiped; the reputational drag, by most accounts, was not.
Why BitMEX was dying anyway
The lawsuit did not cause the shutdown, a decision of this scale is not made in a day, and the more interesting question is why the exchange that created the modern crypto derivatives market ran out of road.
BitMEX’s perpetual swap became the industry’s dominant product, copied by every major venue and now the single largest category in crypto trading. But BitMEX itself never recaptured the market it invented. Liquidity, market makers and large traders migrated to venues with deeper books, wider listings and cleaner legal histories. The competitive picture in 2026 is unforgiving: centralized-exchange perpetual futures volume fell roughly 10% to $12.7 trillion in the second quarter, while the decentralized venue Hyperliquid climbed to become the second-largest perpetuals exchange by open interest, behind only Binance.
The final irony is regulatory. BitMEX built its business offshore precisely because perpetual futures had no lawful home in the United States. That is no longer true — US regulators have moved to permit perpetual futures through registered intermediaries, and domestic platforms are now offering onshore what BitMEX once had to run from Seychelles to provide. The product won completely. Its inventor did not.
Why it matters
For BitMEX’s remaining users, the immediate takeaway is procedural: August 26 is when control begins shifting to the exchange, September 23 is when it ends entirely, and unclaimed balances start incurring fees. Acting early is the only way to keep the timing of any liquidation in your own hands.
For the wider market, Thursday was a marker. One of crypto’s founding institutions, an exchange that ran 11 years without losing customer funds to a hack, a genuine achievement in an industry that has lost billions, is exiting simultaneously with a lawsuit alleging its core risk engine was built against its own customers. Whether that allegation survives contact with a judge is now a question for the Southern District of New York. Either way, the perpetual swap will keep trading long after the platform that invented it goes dark.
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