What Are Perpetual Swaps and How Do They Work in Crypto?
Last Updated: June 2, 2026
Perpetual swaps are derivative contracts that let traders speculate on cryptocurrency prices without ever taking delivery of the underlying asset. Unlike traditional futures, what are perpetual swaps is best understood by their defining feature: no expiration date. You can hold a leveraged position for as long as you want, provided you maintain enough margin and settle funding rate payments every eight hours. These contracts dominate crypto derivatives volume because they combine the flexibility of spot trading with the capital efficiency of leverage—often up to 125× on major exchanges. The mechanism that keeps perpetual swap prices tethered to the spot market is the funding rate, a periodic payment exchanged between long and short positions. When the perpetual trades above spot, longs pay shorts; when it trades below, shorts compensate longs. This creates a self-balancing system that prevents the derivative from drifting too far from reality. Perpetual swaps also use mark price instead of last traded price to calculate unrealized profit and loss, reducing the risk of manipulative liquidations during volatile spikes. By the end of this guide, you'll understand how funding works, when leverage makes sense, and how to manage margin requirements without getting caught in a cascade. If you're evaluating whether perpetual swaps fit your strategy, check out leveraged trading essentials for a broader risk primer.
Key Differences: Perpetual Swaps vs Traditional Futures
| Feature | Perpetual Swaps | Traditional Futures | Spot Trading |
|---|---|---|---|
| Expiration | No expiry; positions can be held indefinitely as long as margin is maintained and funding is paid | Fixed settlement date (quarterly, monthly); position automatically closes or rolls over at expiry | No expiry; you own the asset outright until you decide to sell |
| Funding Rate | Periodic payments every 8 hours to anchor price to spot market; rate fluctuates with demand | No funding mechanism; price converges to spot only at settlement through basis decay | No funding; you pay exchange fees and network fees only when transacting |
| Leverage | Up to 125× on major platforms; amplifies both gains and liquidation risk exponentially | Typically 10–20× depending on exchange and asset; lower than perpetuals but still substantial | None by default; you trade with capital you own, no borrowed exposure |
How Funding Rates Keep Perpetual Swaps Anchored
Funding rates solve the core problem of perpetual contracts: without an expiry date, there's no built-in mechanism to force convergence between the derivative price and the spot market. Every eight hours, traders on the overweight side of the market pay those on the underweight side. If the perpetual is trading above spot—indicating more demand for longs—the funding rate turns positive and longs compensate shorts. This makes holding a long position more expensive over time, encouraging traders to close or short, which pulls the perpetual price back down. When the perpetual trades below spot, the funding rate flips negative and shorts pay longs, incentivizing long entries and pushing the price back up. The rate is calculated using a formula that compares the perpetual's premium or discount to spot over the previous funding interval, often with an interest rate component baked in. According to CME Group's derivatives overview, this funding mechanism is unique to perpetual swaps and doesn't exist in traditional futures, which rely on expiry-driven convergence. On EveDex, you can monitor real-time funding rates across all perpetual markets to anticipate cost and adjust your holding strategy. For a deeper dive into how margin affects your ability to weather negative funding, see position sizing and risk management.
Six Core Mechanics Every Perpetual Trader Should Know
Understanding these mechanics separates profitable perpetual trading from expensive guesswork.
- Mark price vs last price The exchange calculates unrealized PnL and liquidation using mark price—a fair-value estimate derived from multiple spot exchanges—not the last traded price on the perpetual order book. This prevents a thin order book from triggering mass liquidations during a flash spike.
- Initial and maintenance margin Initial margin is the collateral required to open a position; maintenance margin is the minimum you must hold to keep it open. If your equity drops below maintenance due to adverse price movement or funding costs, the exchange liquidates your position.
- Funding interval timing Most exchanges settle funding every eight hours at fixed UTC timestamps. If you close a position one minute before funding, you avoid the payment; if you hold through the timestamp, you pay or receive the full rate regardless of how long you've held the position during that interval.
- Leverage and liquidation price Higher leverage means a liquidation price closer to your entry. At 10× leverage, a 10% adverse move wipes you out; at 2× leverage, you can survive a 50% move. Calculate your liquidation price before entering any trade and set stop-losses well above it.
- Cross margin vs isolated margin Cross margin uses your entire account balance as collateral for all positions, offering maximum flexibility but risking total account loss. Isolated margin locks a fixed amount per position, limiting downside to that allocation but requiring active management across multiple trades.
- Basis and arbitrage opportunities When the perpetual trades at a premium or discount to spot, arbitrageurs can capture the spread by simultaneously buying spot and shorting the perpetual (or vice versa), then collecting funding while the positions offset. This keeps the derivative tethered to reality.
Funding costs compound quickly. A 0.01% rate every eight hours equals roughly 11% annualized if you're on the paying side continuously. For volatile assets with high leverage demand, funding can exceed 0.1% per interval during euphoric rallies, making long positions prohibitively expensive to hold overnight. The U.S. Commodity Futures Trading Commission (CFTC) has noted in public guidance that perpetual swaps fall into a regulatory grey zone outside traditional futures oversight, which is why most retail perpetual platforms operate offshore.
If you're deciding between perpetual swaps and traditional quarterly futures, read crypto futures comparison for a side-by-side breakdown of capital efficiency, rollover friction, and tax treatment. For traders concerned about liquidation cascades during high volatility, EveDex offers advanced order types including take-profit and stop-loss triggers tied to mark price rather than last price.
Trade Perpetual Swaps on EveDex With Transparent Funding
EveDex gives you access to perpetual swaps on BTC, ETH, and 40+ altcoins with leverage up to 125× and transparent, real-time funding rate displays across every market. You can toggle between cross and isolated margin modes per position, set conditional orders that execute when mark price—not last price—hits your trigger, and monitor your liquidation buffer in a unified dashboard. The platform calculates funding every eight hours at 00:00, 08:00, and 16:00 UTC, with rates published 60 seconds before settlement so you can close positions if the cost outweighs the potential gain. EveDex's insurance fund absorbs losses from liquidated positions that fall below zero equity, protecting other traders from socialized losses—a key risk in undercapitalized perpetual markets. If you're new to leveraged derivatives, start with isolated margin at 2–5× leverage to limit downside while you learn how funding, mark price, and volatility interact in live conditions.
