Uncovering Perps: The Crypto Trading Instrument Everyone's Talking About

Perpetual swaps, or 'perps', are a dominant force in the crypto market, handling an estimated $40 trillion to $50 trillion in volume annually. They surpass spot trading and serve as the go-to product for professional traders, hedge funds, and speculators seeking leveraged exposure to assets like bitcoin without actually owning them. Despite their widespread use, the inner workings of perps remain poorly understood. To grasp perps, it's essential to consider their origins. In traditional finance, leveraged exposure typically comes through futures contracts, which involve an agreement to buy or sell an asset at a set price on a specific date. When the date arrives, the contract expires, and traders must roll their position into the next contract if they wish to maintain it. In the early days of crypto, this practice posed persistent problems. Futures contracts traded at a premium to the spot price of bitcoin, a concept known as basis, which confused retail traders seeking straightforward exposure. Moreover, every time a contract expired, positions closed regardless of the trader's intentions. BitMEX, founded by Arthur Hayes and Ben Delo in 2014, attempted to address this issue by shortening contract durations, but none of these efforts proved sufficient. The perpetual swap, developed by Delo and launched by BitMEX in 2016, resolved the problem by eliminating the expiry date entirely. This created a derivative contract that tracks the price of an asset indefinitely, with no settlement date, rolling, or expiry. Traders can hold positions for hours or years. However, this created a structural challenge: without an expiry date, nothing would naturally force the contract price back toward the spot price. BitMEX addressed 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. If the perpetual swap trades above the spot price, indicating excess demand for long positions, long traders pay short traders. If the perpetual swap trades below spot, the payment is reversed. The exchange does not take a cut. The funding rate, which determines the payment rate, is calculated based on the deviation between the perpetual swap price and spot over the preceding eight-hour window. The further the deviation, the higher the rate. This creates a self-correcting equilibrium. When longs are charged a substantial funding rate, it becomes expensive to hold the position, reducing demand and pulling the price toward spot. Market makers accelerate this process by shorting the perpetual swap and buying spot when a meaningful premium opens up, capturing the difference as profit. The funding rate mechanism is now used by every major derivatives exchange. Perpetual swaps are also defined by their use of leverage. Most exchanges allow traders to control positions significantly larger than their deposited capital, with limits varying by platform and jurisdiction. To manage the risk this creates, perpetual swap platforms use automated liquidation systems. If a trader's losses approach the value of their deposited margin, the system closes the position before it can go negative, protecting the exchange from absorbing the deficit. The speed and reliability of that liquidation engine have become key competitive differentiators. Perpetual swaps are now the primary venue for price discovery in crypto. When bitcoin moves sharply, the move typically originates in perp markets before spreading to spot. The structure Delo built in 2016 has proven durable enough that regulators in the U.S. are 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.