How Do Perpetual Swaps Work in Crypto Trading?
Last Updated: September 15, 2026
Perpetual swaps have become one of the most traded instruments in crypto, offering traders a way to speculate on price movements without the constraints of expiration dates. Unlike traditional futures, perpetual swaps let you hold leveraged positions indefinitely, making them attractive for both short-term speculation and longer hedging strategies. Understanding how do perpetual swaps work starts with three core mechanics: leverage, funding rates, and mark price. These contracts track the underlying asset's spot price through a unique payment system between longs and shorts, keeping the derivative aligned with the actual market. If you've traded spot crypto, you'll notice perpetual swaps introduce margin requirements and liquidation thresholds that demand careful position sizing. Many traders are drawn to the capital efficiency — you can control a large position with a fraction of the collateral required in spot markets. EVEDEX, for example, lists perpetual swaps on 52 pairs with fees capped at 0.015% maker and 0.045% taker, and understanding leverage management is still essential before opening your first position. After reading this, you'll understand the funding rate cycle, how exchanges prevent price manipulation, and what to monitor before entering a trade.
Perpetual Swaps vs. Traditional Futures
| Feature | Perpetual Swaps | Traditional Futures | Spot Trading |
|---|---|---|---|
| Expiration Date | None — hold positions indefinitely until closed or liquidated | Fixed expiry, typically quarterly, requiring rollover or settlement | None, but requires full capital and no leverage by default |
| Price Alignment | Funding rate payments keep price close to spot index every 8 hours | Converges to spot price at expiration through arbitrage and settlement | Directly reflects order book supply and demand in real time |
| Leverage | Up to 100x on many exchanges, with dynamic margin requirements | Leverage available, often lower than perpetuals due to expiry risk | Typically 1x unless using margin accounts with different rules |
What keeps perpetual swaps anchored to spot prices
Because perpetual swaps never expire, exchanges use a funding rate mechanism to prevent long-term price drift. Every 8 hours, traders on one side of the market pay the other based on the difference between the swap price and the underlying spot index. When the perpetual trades above spot, longs pay shorts; when it trades below, shorts pay longs. This creates an economic incentive for arbitrageurs to close the gap. The funding rate is published in advance and varies with market sentiment — during bull runs, positive rates can reach 0.1% per interval or higher, costing longs significant capital over time. Exchanges calculate the rate using a combination of the premium (swap price minus index) and an interest rate component, detailed in most exchange documentation like Binance's funding rate explainer. Schedules differ by venue: EVEDEX, for example, calculates the rate every 8 hours but charges it each hour in one-eighth portions, so check the schedule before opening a position. The mark price, used for liquidation calculations, is derived from the spot index plus a dampened funding component to prevent manipulation through isolated order book moves.
Six mechanics every trader should understand
Before risking capital, know how these elements affect your position and P&L.
- Initial margin Your collateral requirement to open a position, inversely proportional to leverage — 10x requires 10% of position size.
- Maintenance margin The minimum equity needed to keep a position open; fall below this and you face liquidation.
- Liquidation price The price level at which your position is automatically closed to prevent negative equity and protect the exchange.
- Funding interval Typically every 8 hours (00:00, 08:00, 16:00 UTC); you pay or receive funding only if holding at the timestamp.
- Mark price vs. last price Mark price is used for liquidations and unrealized P&L to prevent flash-crash manipulation; last price reflects recent trades.
- Insurance fund Pools used by exchanges to cover losses when liquidations don't fully repay borrowed funds, preventing socialized losses across users.
Understanding how to calculate position size is critical when leverage amplifies both gains and losses. A 2% spot move becomes a 20% account change at 10x leverage. Many traders underestimate funding costs over multi-day holds — at 0.05% per 8-hour interval, you pay ~0.15% per day, or ~4.5% per month, which erodes long positions during extended sideways markets.
Perpetual swaps are settled in the base currency or a stablecoin, depending on the contract type. Linear contracts (e.g., BTC/USDT) use USDT as collateral and settle profits in USDT, making P&L easy to calculate. Inverse contracts (e.g., BTC/USD settled in BTC) use the underlying asset as margin, creating non-linear P&L curves that can be counterintuitive for beginners. Most retail traders start with linear swaps because the risk calculation is simpler and doesn't require holding the volatile asset as collateral. Academic research on derivative pricing, including work from the CME Group, provides foundational context for how futures and swaps derive value from underlying spot markets.
Trading perpetual swaps on EVEDEX
EVEDEX lists perpetual swaps on 52 pairs as of September 15, 2026, and all of them trade 24/7. The contracts are linear: margin is posted in USDT and P&L is counted in USDT. Funding follows the logic described above with one difference in timing: the rate is calculated every 8 hours, and one-eighth of it is charged or credited each hour. The platform uses cross margin only, so your entire trading balance backs all open positions. Mark price, the median of two index-based prices and the last trade, drives liquidations as well as stop-loss and take-profit triggers. Leverage reaches 200x on BTC-USD, ETH-USD and SOL-USD for positions up to $50,000 notional, with lower caps on other pairs, and fees are capped at 0.015% maker and 0.045% taker before cashback of up to 35%. If you are new to derivatives, start with low leverage and a small position. Perpetual futures carry a high risk of loss.
