Uncovering Perps: The Ultimate Guide to Crypto's Most Popular Trading Instrument

Perpetual swaps, commonly referred to as perps, have become the dominant force in the crypto trading landscape, handling an estimated $40 to 50 trillion in annual volume. 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 unclear to many. Understanding perps requires a look at their predecessors. In traditional finance, leveraged exposure to an asset typically comes through a futures contract, which is 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 practice led to persistent issues. Futures contracts traded at a premium to the spot price of bitcoin, known as basis, causing confusion among retail traders seeking straightforward exposure. Additionally, when a contract expired, positions would automatically close, regardless of the trader's intentions. BitMEX, a derivatives exchange founded in 2014, attempted to address these issues by shortening contract durations, but none of these efforts were sufficient. The perpetual swap, developed by Ben Delo and launched by BitMEX in 2016, resolved these problems by eliminating the expiry date. 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 any duration, from hours to years. However, this created a structural challenge: without an expiry date, nothing would naturally push 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 made between traders on opposite sides of the market. If the perpetual swap price exceeds the spot price, indicating high demand for long positions, long traders pay short traders. If the perpetual swap price is below spot, the payment is reversed. The exchange does not take a cut. The funding rate, which determines the payment amount, is calculated based on the deviation of the perpetual swap price from the spot price over the preceding eight-hour window. The greater the deviation, the higher the rate. This creates a self-correcting equilibrium, where high funding rates make it expensive to hold long positions, reducing demand and pulling 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 widely used by major derivatives exchanges. Perpetual swaps are also defined by their use of leverage. Most exchanges allow traders to control positions significantly larger than their deposited capital, with varying limits depending on the platform and jurisdiction. At its peak, BitMEX offered leverage of up to 100 times, meaning a 1% move in bitcoin's price would result in a 100% gain or loss on a fully leveraged position. To manage this risk, 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 become negative, protecting the exchange from absorbing the deficit. The speed and reliability of this liquidation engine have become key competitive differentiators in the market. Perpetual swaps have become the primary venue for price discovery in crypto, with significant 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.