Perpetual Swaps Crypto: How Futures Without Expiry Work
Last Updated: June 2, 2026
Perpetual swaps crypto contracts have become the most liquid derivative instrument in digital asset markets, accounting for more daily volume than spot trading on major platforms. Unlike standard futures contracts, perpetual swaps have no expiry date — you can hold a position indefinitely as long as you maintain sufficient margin. The contract tracks the spot price of the underlying asset through a funding rate mechanism that periodically exchanges payments between long and short traders. This structure creates unique arbitrage opportunities and risk profiles that differ from both spot holdings and traditional derivatives.
The mechanics revolve around three core components: leverage (typically 10x to 125x), the mark price (a fair-value reference that prevents manipulation), and the funding rate (which can be positive or negative depending on market sentiment). Traders use perpetual swaps for directional bets, hedging spot portfolios, and capturing basis spreads when funding rates diverge from expected returns. Understanding how margin requirements interact with funding costs is essential before opening leveraged positions, as both profit and loss are amplified by the same multiple.
This guide walks through how perpetual swaps function, what drives funding rates, how exchanges calculate liquidation levels, and when these instruments make sense versus spot trading strategies. By the end, you'll know how to read a perpetual swap order book, estimate your holding costs, and decide whether the funding rate environment favors long or short positions.
Perpetual vs Quarterly Futures
| Feature | Perpetual Swap | Quarterly Futures | Spot Market |
|---|---|---|---|
| Expiry Date | None — positions roll indefinitely until closed or liquidated by the trader | Fixed quarterly settlement — positions close automatically at the expiry timestamp | No expiry — you own the actual asset until you sell |
| Price Anchor | Funding rate mechanism — periodic payments keep contract price near spot index | Convergence at settlement — price aligns with spot as expiry approaches | Direct supply and demand — no derivative mechanism involved |
| Leverage | 10x to 125x on most platforms — amplifies both gains and losses in real time | Typically 5x to 20x — lower than perpetuals due to settlement risk | 1x only — no borrowed capital unless using a margin account |
Why perpetual swaps track spot without expiry
Traditional futures contracts expire on a fixed date, at which point the contract price converges with the spot market through settlement. Perpetual swaps remove the expiry entirely but still need a mechanism to keep the contract price anchored to the underlying asset. Exchanges achieve this with a funding rate — a small periodic payment exchanged between long and short traders every few hours (typically every 8 hours).
When the perpetual contract trades above the spot index, the funding rate turns positive, meaning longs pay shorts. This incentivizes traders to short the overpriced contract or close long positions, pulling the price back down. When the contract trades below spot, the funding rate goes negative and shorts pay longs, encouraging buying pressure. The rate adjusts dynamically based on the premium or discount between the perpetual and the spot index, usually calculated as a time-weighted average across multiple exchanges.
This creates a self-correcting system: if sentiment becomes too bullish and the contract price drifts far above spot, the cost of holding a long position rises until arbitrageurs step in to capture the funding income by shorting the perpetual and buying spot. The opposite happens when fear dominates and the contract trades at a discount. Understanding the current funding rate environment tells you whether the market is paying you to hold a position or charging you for it — a critical factor in both short-term trades and longer-term hedges. The Commodity Futures Trading Commission provides public education on derivatives mechanics, including how similar instruments function in regulated markets.
Six factors that determine your net P&L
A quick sentence to frame the list:
- Entry and exit price Your profit or loss starts with the difference between where you open and close the position, multiplied by your leverage.
- Leverage multiple A 10x position turns a 5% price move into a 50% gain or loss on your margin — liquidation risk scales with the multiplier.
- Funding rate payments Holding through multiple funding periods means you either collect or pay a percentage of your position size every 8 hours.
- Trading fees Most exchanges charge a maker fee (when you add liquidity) and a taker fee (when you remove it) — these compound on leveraged notional size.
- Mark price vs last price Liquidations trigger on the mark price (a fair-value index) rather than the last traded price, protecting against manipulation but sometimes closing positions during brief spikes.
- Slippage and order type Market orders on illiquid pairs can execute far from the displayed price, especially during volatility — limit orders give price certainty but risk missing the entry.
Funding rate history often reveals market sentiment better than price alone. During the 2021 bull run, BTC perpetual funding rates stayed positive for weeks, with longs paying 0.1% to 0.3% daily — an annualized cost exceeding 100%. Traders who ignored funding burned through margin even as spot prices rose. Conversely, during capitulation events, funding can turn deeply negative for days, rewarding shorts who hold through the panic.
The mark price deserves special attention: it's typically calculated as a basket average from multiple spot exchanges, smoothed over a short window. This prevents a single large order on the derivatives platform from triggering liquidations. If the perpetual contract suddenly spikes 10% above the mark price due to a fat-finger trade, your position won't liquidate based on that outlier. However, if the underlying spot market genuinely moves 10% against you, the mark price follows and liquidation becomes real. Check the risk management tools your exchange provides, including isolated versus cross-margin modes.
Trading perpetual swaps on EveDEX
EveDEX structures perpetual swaps around three margin modes: isolated (risk confined to the position), cross (entire account balance backs the trade), and portfolio margin (risk calculated across correlated positions). New traders typically start with isolated margin to cap downside, while experienced users switch to cross or portfolio modes to reduce liquidation risk through shared collateral.
The platform supports real-time funding rate display on the order entry screen, so you see the current 8-hour rate before opening a position. When funding is positive and you're going long, the cost appears as a red percentage; when negative, it shows green if you're short. Position size recommendations adjust automatically based on your selected leverage and available margin — the interface won't let you exceed maximum position limits for the asset's liquidity tier.
EveDEX offers up to 100x leverage on major pairs like BTC and ETH, with lower caps on altcoins depending on order book depth. The liquidation engine uses a tiered approach: as your margin ratio drops toward the maintenance threshold, the system reduces position size incrementally rather than closing everything at once. This gives you a window to add collateral during sharp moves. Funding settlements happen every 8 hours at 00:00, 08:00, and 16:00 UTC — positions open at the time of settlement will pay or receive the rate, even if you close the trade one minute later.
