Perpetual swaps, or perps, have become the dominant trading instrument in cryptocurrency markets, processing an estimated $40 to $50 trillion in annual volume. Yet despite their ubiquity among professional traders, hedge funds and retail speculators, the mechanics that make them function remain poorly understood by many market participants. Understanding perps requires first examining the problems they were designed to solve.
Perpetual swaps launched on BitMEX in May 2015 as an innovation to address structural flaws in traditional crypto futures contracts. In conventional finance, leveraged exposure typically comes through futures contracts, which are agreements to buy or sell an asset at a predetermined price on a specific date. When that expiration date arrives, the contract settles and traders must roll their positions into the next contract to maintain exposure.
This system created persistent headaches in crypto’s early years. Futures consistently traded at a premium to the spot price of bitcoin, a phenomenon known as basis, which confused retail traders seeking straightforward directional exposure. Additionally, every contract expiration forced positions to close regardless of whether traders wanted to maintain them. BitMEX, founded by Arthur Hayes and Ben Delo in 2014, spent months experimenting with shorter contract durations, moving from quarterly to monthly to weekly to 48-hour to 24-hour expiries, but none of these adjustments fully resolved the underlying problem.
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Ben Delo’s solution was elegant in its simplicity: eliminate the expiry date entirely. The perpetual swap contract tracks an asset’s price indefinitely with no settlement date, no rolling requirement and no expiration. Traders can hold positions for hours or years without interruption. However, this innovation created an immediate structural challenge. Without an expiry date to serve as an anchor, nothing would naturally force the contract price back toward the spot price of the underlying asset.
BitMEX solved this through the funding rate mechanism, which has since become the industry standard adopted by every major derivatives exchange worldwide. Every eight hours, payments are exchanged between traders on opposite sides of the market. If the perpetual swap trades above the spot price, indicating excess demand for long positions, traders holding longs pay traders holding shorts. If the perpetual swap trades below spot, the payment flows in the opposite direction. The exchange takes no cut from these transfers.
The funding rate itself is calculated based on how far the perpetual swap price has deviated from spot during the preceding eight-hour window. Larger deviations produce higher rates. This creates a self-correcting equilibrium. When long traders face substantial funding rate charges, holding their positions becomes expensive, reducing demand and pulling the price back toward spot. Market makers accelerate this process by shorting the perpetual swap while simultaneously buying spot, capturing the price difference as profit.
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The other defining feature of perpetual swaps is leverage. Most exchanges allow traders to control positions significantly larger than their deposited capital, though limits vary by platform and jurisdiction. BitMEX historically offered leverage up to 100 times, meaning a 1% move in bitcoin’s price could produce a 100% gain or loss on a fully leveraged position. This follows a pattern seen in related coverage of how platforms are expanding trading capabilities to attract diverse user bases.
To manage the substantial risk this leverage creates, perpetual swap platforms employ automated liquidation systems. If a trader’s losses approach the value of their deposited margin, the system automatically closes the position before it can turn negative, protecting the exchange from absorbing losses. The speed and reliability of liquidation engines became key competitive differentiators in the market’s early years and remain central to how exchanges compete today.
Perpetual swaps have become the primary venue for price discovery in cryptocurrency markets, according to CoinDesk analysis. When bitcoin moves sharply, the movement typically originates in perp markets before spreading to spot markets. The structure Delo developed in 2015 has proven durable enough that 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 evolved into one of the most traded financial products globally.
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