Understanding Perpetual Swaps: The Hottest Crypto Trading Instrument

Perpetual swaps, or 'perps', are a dominant force in the crypto market, with an estimated annual trading volume of $40 trillion to $50 trillion. They surpass spot trading in popularity and are the go-to instrument for professional traders, hedge funds, and retail speculators seeking leveraged exposure to bitcoin and other assets without directly owning them. Despite their widespread use, the inner workings of perps remain poorly understood. To grasp perps, it's essential to consider their precursors. In traditional finance, futures contracts provide leveraged exposure to assets, with an agreement to buy or sell at a set price on a specific date. When the date arrives, the contract expires, and traders must roll their positions into the next contract. In crypto's early days, this led to persistent issues, including futures trading at a premium to the spot price of bitcoin, known as basis, which confused retail traders seeking straightforward exposure. Every contract expiration also resulted in positions being closed, regardless of trader intentions. BitMEX, founded by Arthur Hayes and Ben Delo in 2014, attempted to address this by shortening contract durations, but to no avail. The perpetual swap, developed by Delo and launched by BitMEX in 2016, resolved the issue by eliminating the expiry date, creating a derivative contract that tracks an asset's price indefinitely. This presented a structural challenge: without an expiry date, nothing would naturally push the contract price back toward the underlying asset's spot price. BitMEX solved this through a mechanism that has become the industry standard. Every eight hours, a payment is exchanged between traders on opposite sides of the market, based on the funding rate, which is calculated from the deviation between the perpetual swap price and the spot price over the preceding eight hours. This creates a self-correcting equilibrium, where high funding rates for long positions reduce demand and pull the price back toward spot. Market makers accelerate this process by shorting the perpetual swap and buying spot when a premium opens up, capturing the difference as profit. The funding rate mechanism is now used by every major derivatives exchange. Perpetual swaps also feature leverage, allowing traders to control positions larger than their deposited capital. To manage this risk, exchanges use automated liquidation systems, which close positions before they can go negative, protecting the exchange from deficits. The speed and reliability of these systems have become a key competitive differentiator. Perpetual swaps are now the primary venue for price discovery in crypto, with sharp bitcoin moves typically originating in perp markets before spreading to spot. The structure developed by Delo in 2016 has proven durable, with regulators in the U.S. exploring its application to traditional assets, and the CME potentially listing perpetual swaps on equities. What began as a workaround for crypto futures limitations has become one of the most widely traded financial products globally.