Understanding Perps: The Hottest Trading Instrument in Crypto

Perpetual swaps, or 'perps', are a dominant force in the crypto market, processing an estimated $40 trillion to $50 trillion in annual volume. They surpass spot trading and are the go-to product for professional traders, hedge funds, and retail speculators seeking leveraged exposure to bitcoin and other assets without owning the underlying asset. Despite their widespread use, the mechanics behind perps are not well understood. To grasp perps, it's essential to understand their predecessors. In traditional finance, leveraged exposure typically comes through futures contracts, which expire on a specific date. When the date arrives, the contract settles, and traders must roll their position into the next contract. In crypto's early days, this created 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 time a contract expired, positions closed, regardless of whether traders wanted them to. BitMEX, founded by Arthur Hayes and Ben Delo in 2014, tried to solve this by shortening contract durations, but it wasn't enough. The perpetual swap, developed by Delo and launched by BitMEX in 2016, eliminated the expiry date, creating a derivative contract that tracks the asset price indefinitely. There's no settlement date, rolling, or expiry, allowing traders to hold positions for hours or years. This created a structural challenge: without an expiry date, nothing would naturally force the contract price back to the spot price. BitMEX solved this with a mechanism that's now 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, long traders pay short traders, and vice versa if it trades below spot. The exchange doesn't take a cut. The funding rate is calculated based on the deviation from spot over the preceding eight-hour window. This creates a self-correcting equilibrium, where high funding rates make it expensive to hold positions, reducing demand and pulling the price back to spot. Market makers accelerate this 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. Leverage is another defining feature of perpetual swaps. Exchanges allow traders to control large positions with limited capital, with limits varying by platform and jurisdiction. To manage risk, perpetual swap platforms use automated liquidation systems, closing positions before they go negative and protecting the exchange from deficits. The speed and reliability of liquidation engines are a key competitive differentiator. Perpetual swaps are now the primary venue for price discovery in crypto, with bitcoin moves typically originating in perp markets before spreading to spot. The structure Delo built 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 traded financial products globally.