The history of BitMEX’s perpetual swap and its market evolution

The 2016 breakthrough

BitMEX launched the XBTUSD perpetual swap in May 2016. This contract uses a funding rate to keep the contract price near the spot index. The funding rate mechanism creates periodic payments between long and short position holders to ensure the contract price remains anchored to the spot index of the underlying asset without requiring physical delivery. BitMEX also used a mark price to reduce the risk that a manipulated last trade triggers liquidations. The liquidation engine closes positions before losses exceed posted collateral, while the insurance fund absorbs deficits when liquidations cannot be completed at the bankruptcy price. If the fund is insufficient, auto-deleveraging forcibly reduces profitable positions to preserve the exchange solvency. This combination of tools allowed traders to use high leverage at scale. During the 2018 bear market, these swaps became essential for traders wanting to short Bitcoin or hedge portfolios without managing expiry dates. The original XBTUSD was an inverse contract margined in Bitcoin. A falling Bitcoin price hurt both the position and the collateral value. Directional demand created an imbalance, and professional traders received funding to take the other side. This converted speculative pressure into an incentive for arbitrageurs to commit capital.

The regulatory trap

The US Department of Justice and the CFTC charged BitMEX in October 2020. The company paid a $100 million penalty in 2025 because it failed to maintain adequate AML and KYC programs. While the founders received pardons in March 2025, the liquidity migrated to Binance and Bybit. These competitors captured the market by offering linear USDT and USDC-margined contracts. BitMEX handled over $1 trillion in annual volume in 2019, but its daily volume in 2026 is less than $1 million. The March 2020 market crash saw a liquidation cascade that weakened confidence in BitMEX. BitMEX’s share of derivatives trading fell from 57 percent in 2019 to 0.08 percent by the time of its closure. You should observe that rebuilding a lost liquidity network is much harder than copying a contract specification because liquidity is reflexive. Once liquidity migrates, spreads widen and market makers reduce capital. Retail traders liked the product because it offered straightforward leveraged exposure in a market that never closed.

The 2026 dominance challenge

BitMEX will close its operations on September 23, 2026. The perpetual swap successfully moved into regulated US venues and onchain markets. In Q2 2026, perpetual swaps on centralized exchanges reached $12.7 trillion in volume, while onchain venues like Hyperliquid now hold a 9.3 percent share of global perpetual open interest. In 2026, the CFTC approved Kalshi’s BTCPERP, which became the first regulated US bitcoin perpetual, even as the CME Group filed suit to block its perpetual futures. Coinbase received CFTC approval in July 2025 for bitcoin and Ethereum perpetuals with 12-hour funding cycles. Onchain volume for equity and commodity perpetuals surged from $11.8 billion in December 2025 to $31.0 billion in January 2026. The perpetual swap outperformed its inventor. The product’s dominance grew while the original platform’s influence declined. How will regulated US exchanges manage the volatility of 24/7 synthetic exposure?