Understanding Perpetual Swaps: The Hottest Crypto Trading Instrument Explained

Perpetual swaps, also known as perpetual futures or 'perps', are a type of trading instrument that has taken the crypto market by storm, processing enormous volumes of around $40 trillion to $50 trillion each year. They have surpassed spot trading in popularity and are the go-to product for professional traders, hedge funds, and retail speculators seeking leveraged exposure to bitcoin and other assets without actually owning them. Despite their widespread use, the inner workings of perpetual swaps are not well understood. To grasp the concept of perps, it's essential to look at the traditional finance system, where leveraged exposure to an asset typically involves a futures contract - an agreement to buy or sell at a predetermined price on a specific date. When the contract expires, it settles, and traders must roll over their position to maintain it. In the early days of crypto, this approach created persistent issues, such as futures trading at a premium to the spot price of bitcoin, known as basis, which confused retail traders seeking straightforward exposure. Every time a contract expired, positions were closed, regardless of the trader's intentions. BitMEX, a derivatives exchange founded in 2014, attempted to address this by shortening contract durations, but it wasn't enough. The perpetual swap, developed by Ben Delo and launched by BitMEX in 2016, resolved the issue by eliminating the expiry date altogether, creating a derivative contract that tracks an asset's price indefinitely. There is no settlement date, rolling, or expiry, allowing traders to hold positions for any duration. This created a structural challenge, as the contract price wouldn't naturally revert to the spot price without an expiry date. BitMEX solved this by introducing 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 on the deviation of the perpetual swap price from the spot price over the preceding eight-hour window. This creates a self-correcting equilibrium, where high funding rates make it expensive to hold a position, reducing demand and pulling the price back toward spot. The funding rate mechanism is now used by every major derivatives exchange worldwide. Perpetual swaps also offer leverage, allowing traders to control large positions with limited capital, although this creates risk for the exchange. To mitigate this, platforms use automated liquidation systems to close positions before they become negative. Perpetual swaps have become the primary venue for price discovery in crypto, with sharp bitcoin moves often originating in perp markets before spreading to spot. The structure developed by Delo in 2016 has proven durable, and regulators in the U.S. are now exploring its application to traditional assets, with the CME potentially listing perpetual swaps on equities. What began as a workaround for crypto futures limitations has become one of the most traded financial products globally.