Perpetual futures
Based on Wikipedia: Perpetual futures
In 1992, economist Robert Shiller proposed something radical: a futures contract with no expiration date. A derivative instrument that could be held indefinitely, without the cumbersome need to roll over contracts as they approached delivery. It was an idea born from frustration—Shiller wanted to create derivatives markets for illiquid assets like single-family homes and untraded indices, things that traditional finance had largely ignored. The concept was elegant in its simplicity, yet it would take years before the market truly embraced it.
The world of futures contracts has always been defined by deadlines. Traditional futures have a specific delivery date at the end of their life: when a contract expires, holders must either physically settle the asset or roll their position into a new contract. This rolling process creates what traders call "basis risk"—the nagging difference between futures prices and spot prices accumulates with each rollover, making hedging inefficient and speculation costly. For assets like commodities or indices, this methodology works well enough. But for things like housing markets or labour costs, the friction of expiration dates becomes a barrier to entry.
Perpetual futures solve this problem by removing the expiration date entirely. Think of it as an endless bridge between buyer and seller: instead of settling at a specific point in time, the contract remains open indefinitely. Cash is exchanged periodically—often daily—as the difference between the contract price and the underlying asset's spot price crystallizes. This mechanism is called "cash settlement," and it's fundamentally different from what you see in traditional futures markets.
The payments flow between holders of long positions and short positions, with the direction and magnitude determined by how far the contract price drifts from the underlying asset. If you're holding a perpetual future on Bitcoin, for instance, you'll receive or pay the difference between where the market prices Bitcoin and where it actually trades. No delivery date means no rolling over. The contract lives forever, or at least until you decide to close your position.
Shiller's original vision in 1992 was ambitious. He proposed perpetual futures alongside a method for generating asset-price indices using hedonic regression—a statistical technique that accounts for unmeasured qualities by adding dummy variables representing each element's unique characteristics. The goal was to permit derivatives markets for illiquid, infrequently-priced assets: single-family homes, untraded indices, income flows like labour costs or the consumer price index. It was an attempt to bring mathematical rigor to markets that had been mathematically invisible.
But Shiller's idea remained largely theoretical for nearly two decades. The financial world wasn't ready for indefinitely-lived futures contracts. Traditional exchanges weren't interested in creating products for illiquid assets, and the infrastructure didn't exist to support such instruments. The concept languished in academic papers and conference proceedings, waiting for the right moment to emerge.
That moment arrived with cryptocurrency.
The Crypto Revolution
In 2011, Alexey Bragin developed a solution that would simplify leverage trading of cryptocurrencies on unlicensed exchanges. The product was revolutionary: it combined an inverse nature—where the asset itself serves as margin for trading—with a funding mechanism designed to keep perpetual futures prices close to the underlying asset price.
The innovation was critical because cryptocurrency markets existed in a regulatory grey zone. Before stablecoins became widespread, nearly all perpetual futures traded on unlicensed crypto exchanges were what finance professionals call "inverse futures contracts." The underlying asset was US dollars, and prices were quoted in USD for one Bitcoin. This created something called "non-linear inverse bitcoin futures"—a mouthful of jargon that essentially means the calculation includes an extra layer of complexity.
The advantage was clear: the contract could be useful as a financial instrument while allowing all accounting in Bitcoin, rather than relying on fiduciary currencies. It bypassed the need for exchanges to hold financial licenses, since no accounting occurred in any fiduciary currency. The legal complexities of traditional futures trading disappeared.
When wider adoption arrived in 2016 through derivatives exchanges like BitMEX, perpetual futures became something entirely new. The leverage available was staggering—sometimes exceeding 100 times the margin. This wasn't the cautious leverage of traditional commodities trading; it was something far more aggressive and, frankly, far more dangerous.
How Auto-Deleveraging Works
The cryptocurrency perpetual market developed unique mechanisms to handle this extreme leverage. Chief among them is auto-deleveraging—a mechanism that compels high-leverage, profitable traders to forfeit a portion of their profits to cover the losses of counterparties during periods of high market volatility.
When volatility spikes, prices move violently in one direction. Traders with positions on the losing side see their margins evaporate rapidly. The system must step in to cover these losses so that the market remains solvent. The mechanism forces profitable traders—those who are winning—to share their gains with those whose positions have been wiped out. It's a form of financial triage, ensuring that someone always pays the piper when markets go haywire.
Alongside auto-deleveraging sits another protective layer: insurance funds. These pools of assets exist to prevent the need for auto-deleveraging in the first place—smoothing out the turbulence before chaos forces itself onto the winners. Think of it as a cushion that absorbs the worst market shocks, protecting both sides from complete annihilation.
The Structure of Perpetual Markets
Perpetual futures serve the same function as contracts for difference (CFDs)—allowing indefinite, leveraged tracking of an underlying asset or flow. But there's a crucial distinction: a single, uniform contract is traded on an exchange for all time-horizons, quantities of leverage, and positions.
This uniformity creates efficiency. Traditional CFD trading typically involves separate contracts for separate quantities of leverage—you negotiate with your broker, agree on terms, execute the trade. With perpetual futures, everyone trades the same instrument regardless of their position size or time horizon. The exchange handles standardization, making the market more liquid and easier to price.
The daily settlement mechanism for perpetuals intended to mirror flows like dividends requires payment from one side of the contract to another. At any day t, the dividend is defined as: s(t+1) = (f(t+1) - f(t)) + (d(t+1) - r(t)f(t)), where f represents the price of the perpetual at day t, d represents the dividend paid to owners of the underlying asset on that day, and r represents the return on an alternative asset—expected to be a short-term, low-risk rate—between time t and t+1.
This mathematical formulation ensures that the perpetual contract stays anchored to its underlying asset. The funding mechanism built by Bragin in 2011 keeps prices close to reality: funding is paid regularly to incentivize price movement closer to the actual asset price. It's a beautiful self-correcting mechanism.
The Trade-Offs
The drawback of this solution was significant and specific: non-linearPnL, generating what practitioners call "convexity"—the second derivative of a contract's value with respect to price. This mathematical property means that long positions will be liquidated faster on price falls than short positions will be on price rises.
The implications are serious for traders. When markets move sharply downward, those holding long positions face liquidation much more aggressively than their counterparts on the short side when markets rise. The asymmetry isn't a bug—it's a feature of perpetual futures designed to keep prices close to underlying assets.
From Theory to Practice
What Shiller proposed in theory and Bragin built for crypto now represents one of the most liquid derivative instruments in the world. Cryptocurrency perpetuals handle enormous volume daily, with leverage that would make traditional futures traders weep. The funding mechanisms ensure price discovery happens continuously rather than at discrete expiration dates.
The journey from a 1992 academic proposal to 2011's crypto innovation to today's massive perpetual markets shows how financial engineering responds to constraints. Traditional finance couldn't create derivatives for illiquid assets because the infrastructure didn't support indefinite contracts. Crypto created that infrastructure, and in doing so, spawned an entirely new class of instruments.
The market continues to evolve. New exchanges offer perpetuals on traditional assets like equities and commodities. The same principles—cash settlement, no expiration, funding mechanisms—apply across asset classes. But the roots trace back to Shiller's frustration with illiquid markets and Bragin's solution for unlicensed crypto exchanges.