Perpetual Contracts: How They Work and Why They Exist
Perps are the most traded instruments in crypto—more than spot, more than futures. Here's how they actually work.
Perpetual Contracts: How They Work and Why They Exist
Perpetual contracts are the most traded instruments in crypto. More volume than spot. More than futures. And most traders using them don't fully understand how they work.
That's not an insult—it's just how most people enter markets. They learn the interface before they learn the instrument. But with perps, the mechanism matters. It affects every trade you make, the fees you pay, and whether a strategy that looks profitable on paper actually is.
What Is a Perpetual Contract?
A perpetual contract is a derivative. You're not buying or selling the underlying asset—you're entering into an agreement that tracks its price.
Think of a traditional futures contract: you agree to buy 1 ETH at $3,200 on a specific date three months from now. On that date, the contract settles and closes. The expiry forces the futures price back into alignment with the spot price.
A perpetual contract removes the expiry. You can hold the position for a day, a week, a year—as long as you have enough collateral and the economics allow it. There's no settlement date, no rollover, no need to close and reopen positions as contracts expire.
What you're trading is a synthetic version of the asset. The perp market for ETH doesn't move ETH itself. It creates a parallel price that needs to stay close to the real one through a different mechanism—which is where funding rates come in.
How They Actually Work
When you open a perpetual position, you make two choices: direction and leverage.
Direction is simple. You go long if you expect the price to rise. You go short if you expect it to fall. In spot markets, going short is complicated—you need to borrow the asset, sell it, and buy it back later. In perp markets, going short is as easy as clicking "sell."
Leverage is where it gets important to understand precisely. When you open a position with leverage, you're putting up a fraction of the total exposure as collateral—called margin. With $1,000 and 10x leverage, you control a $10,000 position. Your gains and losses are calculated on the full $10,000, not just your $1,000.
The price you open at is your entry price. As the market moves, the difference between the current mark price and your entry price determines your unrealized profit or loss. If you're long ETH at $3,000 and the mark price is $3,300, you're up 10% on your exposure—which on a 10x position means your $1,000 margin has grown to $1,300.
The flip side is liquidation. If the market moves against you and your losses approach your margin balance, the exchange closes your position automatically. On a 10x position, a 10% move against you wipes your margin entirely. Most exchanges liquidate before that point—when your margin falls below the maintenance margin threshold—to protect both you and the system. The actual liquidation price is slightly better than total loss, but not by much. The position closes, the margin is lost, and there's no way to recover it after the fact.
The Funding Rate Mechanism
This is the part most traders gloss over, and it's the most important piece of mechanics in the entire system.
The problem is straightforward: with no expiry date, what keeps the perp price from drifting far away from the spot price? Futures converge at settlement. Perps have no settlement. Something else has to do the work.
The solution is funding rates—periodic cash transfers between longs and shorts, calculated based on the difference between the perpetual price and the spot price.
When the perp price is trading above spot, it means there's more demand for longs than shorts. The market is bullish and levered. In this state, longs pay shorts. This payment discourages new longs, makes existing longs more expensive to hold, and incentivizes new shorts to enter. The combined effect pushes the perp price back down toward spot.
When the perp price is trading below spot, the opposite applies. Shorts pay longs. Holding a short gets progressively more expensive. New shorts are discouraged. The perp price drifts back up.
The frequency varies by exchange. Some protocols charge funding every 8 hours—the traditional standard from centralized venues. Others charge every hour, or even continuously. The rate itself floats based on market conditions and can be positive or negative.
Here's a concrete example. If ETH funding is +0.01% per hour and you're short 1 ETH at $3,000, you receive $0.30 per hour. That sounds trivial. But $0.30 per hour is $7.20 per day, $219 per month, $2,628 per year—on a $3,000 position. That's an 87% annualized yield, just from holding the short while funding is positive.
Of course, funding rates don't stay constant. They fluctuate with market sentiment, sometimes turning negative for extended periods if the market is persistently bearish. But understanding that funding is a real, continuous cash flow—not just a footnote—changes how you think about positions.
Why Perps Dominate Crypto Trading
The dominance of perpetual contracts in crypto volume isn't accidental. Several structural advantages explain it.
No expiry management. In traditional futures markets, traders constantly roll their positions from expiring contracts to new ones. This costs money and requires active management. Perps eliminate the problem entirely. You open a position and hold it for as long as you want.
Straightforward short exposure. Shorting an asset in spot markets requires borrowing it, which adds complexity, cost, and availability constraints. In perp markets, going short is identical mechanically to going long—same interface, same process, same fees.
Leverage access at scale. Major venues offer 10x, 20x, even 50x leverage on liquid pairs. This concentrates trading activity because a smaller amount of capital can express larger views.
Deep liquidity on major pairs. Because volume concentrates in perps, liquidity follows. BTC and ETH perp markets are among the most liquid trading venues in the world, tighter spreads than many traditional asset markets.
And the 24/7 nature of crypto means perp markets never close. There's no overnight gap risk from market hours. Positions respond to news in real time regardless of when it breaks.
Perps on DEXs vs CEXs
The mechanics described above apply to both centralized and decentralized perp venues—the underlying system is the same.
The difference is in structure. Centralized exchanges like Binance or Bybit run the orderbook, hold custody of your funds, and require KYC. They offer the deepest liquidity and the most familiar trading experience, but you're trusting the exchange with your capital.
Decentralized perp protocols—Hyperliquid, Paradex, Lighter, and others—operate on-chain or with on-chain settlement. You retain custody. The mechanics are transparent and auditable. One key technical difference: DEXs typically derive their mark price from external oracles—Chainlink, Pyth, or similar networks—rather than from internal data. This means the reference price is determined independently from the trading venue itself, which adds a layer of transparency but also introduces oracle-specific risks (delays, deviations) that don't exist on CEXs. The trade-offs also include sometimes different UX and occasionally shallower liquidity on minor pairs, though this gap has narrowed significantly.
The funding rate mechanism, liquidation logic, and margin system work the same way on both. Choosing between them is about custody preference, oracle model, and liquidity requirements, not fundamental mechanical differences.
The Risks
Perps are powerful. They are also genuinely dangerous to trade without understanding them, and that's worth being direct about.
Leverage amplifies losses as much as gains. A 10% move against a 10x position eliminates your margin. The math is simple and unforgiving. Most retail traders who blow up accounts do so not from bad analysis but from position sizing that doesn't account for normal volatility.
Liquidation happens fast. In volatile markets, prices move enough to trigger cascading liquidations, which in turn move prices further. Being liquidated during a liquidation cascade often happens at worse prices than your liquidation threshold.
Funding rates can flip against you. If you're holding a long because you're bullish, but the market has been bullish for a long time, you may be paying 0.03-0.05% per hour in funding. That erodes your position steadily. A trade that was right directionally can still lose money if the holding cost is high enough and the move takes too long.
And unlike spot positions, perps are not "set and forget." They require active monitoring—not necessarily constant, but regular. A position left unattended during a volatile period can be liquidated before you have a chance to respond.
A Tool, Not a Game
Perpetual contracts are powerful tools. They allow traders and institutions to express directional views, hedge existing exposure, and access leverage without the complexity of traditional derivatives infrastructure.
The funding rate mechanism that keeps them working is also what creates opportunities for more sophisticated strategies—including delta-neutral approaches where you capture funding yield without taking directional risk. But that's a topic for another article.
If you're using perps, understand the funding rate as a continuous cost or income, not background noise. Size positions relative to your margin, not your conviction. And know where your liquidation price is before you open the trade, not after you're watching it happen.
Next in this series: The Risks of Trading on DEXs and Perpetual Markets
This article is part of the ArchiNeutral Education Series. It's educational content—nothing here is financial advice.