Perpetual Futures Explained: The No-Expiry Contract That Powers Crypto Trading

A perpetual futures contract, often shortened to perps, is a futures contract with no expiry date. Instead of settling once at a fixed future date the way a traditional futures contract does, it stays open indefinitely and uses a recurring payment called the funding rate to keep its price tied to the spot market. That single mechanism, funding, is the entire reason perpetuals can avoid expiring at all.

Every other question about perpetuals branches off that one fact. Why does a contract need an expiry date in the first place, and what replaces it when there isn't one? How do you actually calculate a funding payment, in dollars, on a real position? And once you understand funding, does "no expiry" really mean the contract never settles, or does it mean something more precise than that? This guide answers all three with real numbers.

What Is a Perpetual Futures Contract?

A perpetual futures contract is an agreement to be long or short an asset's price with no fixed settlement date. It is called a perpetual swap in some documentation, and traders shorten it to perps in conversation; the two terms describe the same instrument, not two different products. What makes it a futures contract at all, rather than just holding the asset, is that it is cash-settled and derives its value from an underlying spot price without requiring ownership of that asset, the same basic structure as a traditional futures contract, minus the expiry date.

TradFi built its entire futures infrastructure, clearing houses, contract months, delivery windows, around the assumption that every contract eventually expires. Crypto exchanges had no such legacy infrastructure to work around when they launched, and no regulatory requirement forcing them to adopt fixed expiry either, so when the funding-rate mechanism was proposed as an alternative anchor, they were free to build around it from day one. That is a large part of why perpetuals are a crypto-native instrument rather than a TradFi one: not because the idea only works for crypto, but because crypto exchanges were the first venues with both the technical freedom and the market demand to run it at scale.

Perpetual vs. Traditional Futures: Why There's No Expiry Date

A traditional futures contract, the kind traded on exchanges like CME, has a fixed expiry. On the last trading day, the contract is marked to a final settlement price and either cash-settled or physically delivered. A trader who wants to stay in the position has to roll it, closing the expiring contract and opening a new one in the next contract month. That expiry date is what keeps the futures price tethered to spot: as expiry approaches, the futures price and the spot price are forced to converge, because at settlement they become the same number by definition.

A perpetual contract has no such date to converge toward. Nothing forces its price back to spot the way expiry does for a traditional future. Exchanges solved this by inventing a substitute anchor, the funding rate, a direct payment between the two sides of the trade that does the job expiry used to do, without ever requiring the contract to close.

How Do Perpetual Futures Work?

A perpetual futures position works like any leveraged derivative: you post margin, select a leverage ratio, and open a long or short position sized against a notional value. What is specific to perpetuals is how the exchange prices your ongoing profit and loss, how it decides when to charge or pay funding, and how it reports the overall state of the market you're trading into.

Mark Price vs. Last Traded Price

Perpetual exchanges track two separate prices for the same contract. The last traded price is exactly what it sounds like, the price of the most recent trade on that exchange's order book. The mark price is different: it is typically an index price blended across several spot markets, adjusted for the cost of holding the position, specifically so a single large order or a thin moment of liquidity on one venue cannot trigger a liquidation that spot prices elsewhere never confirmed. Your unrealized profit and loss, and your liquidation price, are calculated against the mark price, not the last traded price. This is a detail almost every beginner skips past, and it is the reason two accounts with identical leverage on the same asset can show different unrealized PnL at the same moment.

Open Interest: What It Tells You

Open interest is the total number of contracts currently open across the market, rising when new positions are created and falling when they are closed, distinct from trading volume, which resets every day. On a perpetual futures market, open interest tells you how much leveraged exposure is currently sitting on the books, long and short combined. Rising open interest alongside a persistently one-sided funding rate is a specific, readable signal: it means new leveraged positions keep piling onto the crowded side even as funding gets more expensive for them, a setup that historically precedes sharp, fast unwinds once that crowd starts getting liquidated.

Funding Rates: The Mechanism That Replaces Expiry

The funding rate is a periodic payment exchanged directly between long and short position holders, calculated from the gap between the perpetual contract's price and the underlying spot index price. When the perpetual trades above spot, longs pay shorts. When it trades below spot, shorts pay longs. The payment is small, usually a fraction of a percent, and it repeats every funding interval, commonly every 8 hours, for as long as the position stays open. There is no month-end, no settlement date, no roll. Just a recurring, mechanical transfer that nudges the contract price back toward spot every single interval.

Here is where the "no expiry" framing that dominates this topic, on every ranking guide, quietly overstates its case. A perpetual future does not avoid settlement, it trades one settlement event for many. A traditional futures contract settles once, in full, at expiry. A perpetual contract settles continuously, in small increments, every funding interval. The funding payment is not a fee bolted onto an otherwise settlement-free contract, it is the settlement, paid out on a rolling basis instead of a single date. "No expiry" is accurate. "Never settles" is not, and that distinction is exactly why a position that never technically expires can still bleed money every eight hours, whether the price moved or not.

Worked Example: A Funding Payment on a 10x Long BTC Perp

Say BTC trades at $60,000 and you hold a 10x long perpetual position with $1,000 of margin, controlling a $10,000 notional position (0.1667 BTC). The exchange's funding rate for this interval is 0.01%, in line with the default interest-rate component many exchanges use, applied every 8 hours. On $10,000 of notional, that is a $1 payment every 8 hours, or $3 a day. If longs are paying shorts, that $3 comes directly out of your margin, regardless of whether BTC moved at all in that period. Hold the position for a week and you have paid $21 in funding alone, before any price movement is even considered.

Annualized, a steady 0.01% charged every 8 hours works out to roughly 11% a year in funding costs alone, assuming the rate and your position size never change, which they rarely do in practice. That is why funding cost matters as much as direction for anyone holding a perpetual position for weeks rather than hours: a directionally correct trade can still lose money if it is held long enough against a persistently unfavorable funding rate. Nothing about that $21, or the 11% it implies annualized, is optional or negotiable. It is not a trading fee charged once at entry, it is charged again, and again, for every interval the position stays open.

Why Longs Pay Shorts (and When It Flips)

Funding direction is set by market positioning, not by exchange policy. When more traders are long than short, typically during a bullish run, the perpetual price trades slightly above spot, and the funding rate turns positive: longs pay shorts. This makes staying long marginally more expensive and staying short marginally more rewarding, which pulls new capital toward the short side and pushes the contract price back down toward spot. When sentiment flips and shorts crowd the trade, the funding rate goes negative, and the payments reverse: shorts now pay longs. Funding is not guaranteed income for either side, it is a self-correcting cost that punishes whichever side of the trade is currently overcrowded, and it can flip direction within a single day if positioning shifts fast enough.

Perpetual Futures in Crypto vs. TradFi

Crypto exchanges did not invent the mechanics of a futures contract. What they changed is which anchor keeps the price honest. TradFi relies on a hard expiry date and eventual physical or cash settlement, reinforced by clearing houses and regulatory oversight built around that expiry cycle. Crypto perpetuals rely on a continuous funding payment instead, enforced purely by the exchange's own matching engine, which is what makes them native to a market that never closes and has no clearing calendar to work around.

Factor	Traditional Futures (TradFi)	Perpetual Futures (Crypto)
Expiry date	Fixed; contract settles or must be rolled	None; position can be held indefinitely
Settlement	One final settlement at expiry	Continuous, via periodic funding payments
Price anchor mechanism	Convergence to spot as expiry approaches	Funding rate, paid every 1 to 8 hours
Rolling required	Yes, to keep a position open past expiry	No, the contract never needs to be replaced
Typical venue	Regulated futures exchanges (e.g. CME)	Crypto exchanges, largely unregulated in most jurisdictions
Trading hours	Scheduled sessions	Continuous, 24/7

The practical consequence of that difference is who carries the ongoing cost of staying in a position. A TradFi trader rolling a futures contract pays a bid-ask spread and a roll cost roughly once a quarter. A crypto trader holding a perpetual pays funding roughly three times a day, every day, whether they roll or not. Neither structure is safer than the other, they simply distribute the cost of an open position differently over time.

That distribution has a risk consequence beyond just cost. A TradFi trader who cannot afford a roll simply lets the contract expire and settle, a bounded, scheduled event. A crypto trader who cannot afford a funding payment risks something less predictable: falling below maintenance margin between payments, at any hour, on a market that never pauses to give them a scheduled moment to react. The absence of an expiry date removes one kind of deadline pressure and replaces it with a different, more continuous one.

Where to Trade Perpetual Futures

Perpetual futures are available on most major crypto exchanges, and increasingly through TradFi-adjacent venues too, but the products differ meaningfully in margin account structure, in how transparently the mark price and funding rate are disclosed before you open a position, and in whether collateral for a perpetual position can be shared with other markets on the same platform or has to sit in an isolated crypto-only account. Ouinex lets you trade perpetual futures from the same crypto-funded margin account used for its other CFD markets, with funding and liquidation mechanics disclosed the same way across every asset class rather than a separate standard for crypto alone.

FAQ

What is a perpetual futures contract?

A perpetual futures contract is a futures contract with no expiry date, kept aligned with the spot price through a recurring funding payment between long and short holders instead of a fixed settlement date.

What happens if the funding rate goes negative?

A negative funding rate means shorts pay longs instead of the usual direction. It typically happens when the perpetual price trades below spot, often because short positioning has become crowded, and it makes holding a short marginally more expensive until positioning rebalances back toward longs.

Are perpetual futures the same as perps?

Yes. "Perps" is simply the shorthand traders use for perpetual futures contracts, sometimes also called perpetual swaps in exchange documentation. All three terms, perpetual futures, perpetual swaps, and perps, refer to the same no-expiry instrument, not three different products.

Can perpetual futures be traded outside crypto?

Perpetual futures are used almost exclusively in crypto markets today. Traditional futures exchanges like CME still rely on fixed-expiry contracts with scheduled settlement, and have not adopted the funding-rate model at scale, largely because their clearing infrastructure and regulatory framework are built around expiry-based settlement rather than continuous funding. A handful of TradFi-adjacent platforms have started experimenting with perpetual-style products, but as of today they remain the exception rather than the norm outside crypto.

How This Connects to Leverage and Derivatives

A perpetual futures contract is not a standalone product, it is a specific instance of a broader idea. Perpetual futures are a type of derivative, meaning their value is derived from an underlying asset's price rather than from owning that asset directly. And because most traders open a perpetual position with a fraction of its notional value posted as margin, perpetual futures are usually traded with leverage, which means everything already covered about margin, liquidation price, and maintenance thresholds applies directly to a perpetual position, funding rate included. Understanding perpetuals without understanding leverage is like understanding the funding rate without understanding what it is protecting: a leveraged position that would otherwise have no anchor to spot at all.

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