BitMEX Invented the 100x Perpetual Swap, Beat a Criminal Case With a Presidential Pardon, Then Lost to the Product It Created. Leave Money There Now and It Costs You $50 a Month

BitMEX stopped trading on September 23 at 04:00 UTC, 11 years after launch. It invented the perpetual swap in 2016 and once handled about 57% of all crypto derivatives trading. Perps did $61.7 trillion in volume in 2025, and almost none of it went through BitMEX. The company says it never lost user funds to a hack, but it still owes something: the Celsius estate filed a $490 million lawsuit over 2020 liquidations eleven days before the shutdown. Here's what happened, what users need to do before the fees start, and what it means if you work in derivatives.