Perpetual Futures Explained: How Leveraged Crypto Trading Actually Works

Perpetual futures are the most-traded financial product in the entire crypto market — bigger than spot Bitcoin, bigger than Ethereum, bigger than everything else combined. On a typical day, over $80 billion in perpetual futures change hands across major exchanges. And yet most UK traders who ask about them have only a vague sense of what they are. That vagueness is expensive. Understanding how perps actually work — the funding rate, the liquidation engine, the leverage mechanics — is the difference between using them deliberately and getting wiped out by something you didn’t see coming.

What Are Perpetual Futures?

A perpetual future is a derivative contract that tracks the price of an underlying asset — Bitcoin, Ethereum, Solana, whatever — without ever expiring. That’s the key word: perpetual. Traditional futures contracts have an end date. When they expire, you settle and move on. Perpetual futures don’t expire. You can hold a position for five minutes or five months.

You never own the underlying asset. You’re trading a contract that reflects its price. If Bitcoin is trading at £60,000 and you open a long perpetual futures position, you profit when Bitcoin goes up and lose when it goes down — without ever actually holding Bitcoin. This is what makes them useful for short-term speculation and hedging, and what makes them dangerous for people who treat them like spot trading.

They were invented by crypto exchange BitMEX around 2016. By 2026, perpetuals account for roughly 75% of all crypto derivatives volume globally. Binance alone processes more perp volume in a day than most traditional stock exchanges handle in a week.

The Funding Rate: The Mechanism That Holds It Together

Here’s the question most guides skip: if a perpetual future never expires, how does its price stay close to the spot price? The answer is the funding rate — and it’s one of the most important things to understand before you touch perps.

Every eight hours (on most exchanges), a payment passes between traders on opposite sides of the market. When more people are long than short — betting on price rising — the perpetual price tends to trade above the spot price. To correct this, longs pay shorts a small fee. When more people are short, shorts pay longs. The rate floats based on how far the perp price has drifted from spot.

In practice, the funding rate is usually small. A typical rate is around 0.01% every eight hours, which works out to roughly 10.95% annualised if it stayed constant. But it can spike dramatically during market manias. In the run-up to Bitcoin’s all-time highs in late 2024, funding rates hit 0.1% every eight hours — over 100% annualised — meaning longs were paying a serious ongoing cost just to hold their position.

How Leverage Works — And Why It Cuts Both Ways

Leverage is the thing that makes perpetuals attractive and dangerous in equal measure. With 10x leverage, a £1,000 position controls £10,000 worth of exposure. A 10% move in your favour doubles your money. A 10% move against you wipes it out entirely. That’s not a metaphor. That’s the maths.

When I looked at the data on retail crypto trading accounts, the numbers are grim. A 2023 study found that over 80% of retail accounts that use leverage above 10x lose money over a rolling 12-month period. That’s not because the markets are rigged. It’s because the combination of leverage, funding costs, and the psychological difficulty of holding losing positions means most people exit at the worst possible moment.

Most exchanges offer leverage from 2x up to 125x on major pairs. Higher leverage doesn’t mean higher potential — it means a smaller adverse move is enough to liquidate you. At 100x leverage, a 1% move against your position is enough to trigger a wipeout.

Liquidation — What Happens When It Goes Wrong

Liquidation is the exchange forcibly closing your position because your losses have eaten through your margin. Every position has a liquidation price — the point at which your account balance can no longer cover the unrealised loss. When price hits that level, the exchange liquidates you automatically and keeps whatever margin remains to cover the loss.

Exchanges set a maintenance margin level — typically 0.5% to 1% of the position size — that your account must stay above. If your balance drops below that threshold, liquidation triggers. You don’t get a phone call. You don’t get a grace period. It happens in milliseconds.

Cascade liquidations are a real market phenomenon. When many traders are holding leveraged longs at similar prices, a sharp drop triggers a wave of liquidations. Each liquidation adds selling pressure, which drops the price further, which triggers more liquidations. In May 2021, over $8 billion in crypto positions were liquidated in a single 24-hour period. That wasn’t a hack or a glitch. It was the liquidation engine doing exactly what it was designed to do.

Long vs Short: How Both Sides Work

Going long means you’re betting the price will rise. It’s the natural direction for anyone bullish on an asset. Going short means you’re betting the price will fall — and this is where perpetuals offer something spot trading doesn’t. In spot markets, shorting an asset requires borrowing it first, which is complicated and costly. In perpetuals, opening a short is as simple as opening a long, just in the other direction.

Short positions are used for speculation on falling prices but also for hedging. A crypto miner holding Bitcoin might short BTC perps to lock in a sale price without actually selling their coins. A fund holding altcoins might short BTC perps to reduce overall market exposure without liquidating their portfolio. These are legitimate use cases — the same reason professional traders use derivatives on every other asset class.

The distinction between speculative shorts and hedging shorts matters for UK tax purposes. HMRC treats gains from crypto derivatives as capital gains or trading income depending on the frequency and nature of the activity. Short positions that result in gains are taxable. Losses can be offset. But the rules get complex quickly, and professional advice is worth getting before you start.

The UK Regulatory Picture — What the FCA Actually Did

In January 2021, the FCA banned the sale of crypto derivatives — including perpetual futures — to UK retail consumers. This applied to all FCA-regulated firms. You cannot legally buy or sell crypto perps through a UK-regulated broker if you’re classified as retail. The FCA cited extreme volatility, lack of legitimate investment need, and inadequate market integrity as reasons.

In practice, most UK traders who use perps do so through offshore exchanges — Bybit, Binance, OKX — which are not authorised by the FCA for UK retail derivatives trading. Using these platforms is technically accessing products the regulator has deemed unsuitable for UK retail investors. There’s no law that criminalises the individual trader for doing so, but there is also no Financial Services Compensation Scheme (FSCS) protection if the exchange collapses. Celsius, FTX, and Voyager are the recent cautionary examples. Over 80,000 UK creditors were caught in the FTX collapse in 2022.

UK investors keen on this area should note that professional classification — available to those with sufficient portfolio size or trading experience — removes the ban. But claiming professional status comes with significant requirements, and most retail traders don’t qualify.

The Costs That Grind You Down

Beyond liquidation risk, perpetual futures have ongoing costs that compound over time. Funding rates are the biggest. If you’re consistently on the popular side of the trade, you’re paying the minority. During bull markets, longs pay shorts continuously. A funded rate of 0.03% every eight hours sounds trivial but adds up to 32.85% annualised. That’s a serious drag on returns.

Exchanges also charge trading fees on each open and close. Maker fees (adding liquidity) run around 0.02%; taker fees (removing liquidity) around 0.05-0.06%. On high-frequency trading, these stack up. A trader opening and closing three positions per day at 0.05% each way pays over 100% of their position in fees per year before any market movement.

Slippage — the difference between the expected execution price and the actual price — is another cost most people underestimate. On large positions, or during volatile markets, slippage can significantly erode returns. The listed price and the filled price are rarely identical.

What This Means for You

If you’re a UK retail investor, the honest starting point is: perpetual futures are not designed for you. The FCA drew that line for reasons that the data largely supports. The combination of leverage, funding costs, liquidation mechanics, and the psychological difficulty of managing leveraged positions means the majority of retail accounts that use them lose money.

That doesn’t mean ignoring them entirely. Understanding how perps work helps you understand crypto market dynamics. Funding rates signal market sentiment. Liquidation levels explain why price sometimes crashes sharply and recovers just as fast. Open interest data reveals where large positions are concentrated. This is all genuinely useful context for anyone invested in crypto, even if you never trade a perp yourself.

If you do decide to explore this area — perhaps on a small amount you’re genuinely prepared to lose — start with the lowest available leverage, understand your liquidation price before you open any trade, and account for funding costs in your calculations. And get proper tax advice from an accountant familiar with crypto. HMRC will want to know about your gains regardless of where the exchange is based.

This article is for educational purposes only and does not constitute financial advice. Cryptocurrency investments involve significant risk. Always do your own research.