Understanding Perpetual Swaps: The Driving Force Behind Crypto's Most Traded Financial Instrument

Perpetual swaps, also known as perps, have become the go-to trading instrument in the crypto market. They facilitate leveraged exposure to assets like bitcoin without requiring ownership, with traders, hedge funds, and speculators relying on them for directional exposure. Despite their widespread use, the underlying mechanics of perps remain poorly understood. To grasp the concept of perps, it's essential to consider their origins. In traditional finance, futures contracts provide leveraged exposure to an asset, with an agreement to buy or sell at a predetermined price on a specific date. However, this approach created issues in the early days of crypto. Futures traded at a premium to the spot price, causing confusion among retail traders seeking straightforward exposure. Furthermore, contract expirations led to position closures, regardless of the traders' intentions. BitMEX, founded in 2014, addressed these problems by shortening contract durations, but ultimately, a more innovative solution was needed. The perpetual swap, developed by Ben Delo and launched by BitMEX in 2016, eliminated the expiry date, creating a derivative contract that tracks an asset's price indefinitely. This introduced a structural challenge, as the contract price could deviate from the spot price without an expiry date to anchor it. To mitigate this, a funding rate mechanism was implemented, where payments are exchanged between traders on opposite sides of the market every eight hours. This self-correcting equilibrium ensures the contract price remains aligned with the spot price. The funding rate is calculated based on the deviation between the perpetual swap price and the spot price over the preceding eight-hour window. When the perpetual swap trades above the spot price, long positions are charged a funding rate, making it expensive to hold, which reduces demand and pulls the price back toward spot. Market makers accelerate this process by shorting the perpetual swap and buying spot, capturing the difference as profit. Leverage is another defining feature of perpetual swaps, with most exchanges allowing traders to control positions significantly larger than their deposited capital. To manage the associated risk, exchanges use automated liquidation systems to close positions before they can go negative, protecting the exchange from absorbing the deficit. 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, with regulators in the U.S. now exploring its application to traditional assets.