What Is a Perpetual Future (Perp)? Explained Simply

What Is a Perpetual Future?

A perpetual future, a perp, is a derivative contract that lets you bet on a crypto asset's price with leverage, long or short, without ever owning the asset and without the contract expiring. It is the most traded product in crypto by a wide margin. It is also where most leverage losses happen.

How It Actually Works

A normal futures contract settles on a date. A perp never settles, so exchanges need another way to keep its price glued to the real spot price. The mechanism is the funding rate: every few hours, whichever side of the market is more crowded pays the other side a small percentage. Perp trading above spot means longs pay shorts, nudging the price down toward reality. Below spot, shorts pay longs. The contract tracks the asset by making imbalance expensive.

Because you post margin rather than buying the asset, perps come with leverage built in, and with leverage comes the liquidation engine.

Spot vs. Perps

Spot: you own the coin. Worst case, it goes to zero and you still own it.
Perps: you own a position. It can be force-closed at a loss while the asset you were right about goes on to prove you right without you.
Being right eventually is worthless in perps. You have to be right before your margin runs out.

Risks and Common Mistakes

Ignoring funding. Paying 0.03 percent three times a day sounds tiny and compounds into a real drag on held positions.
Trading perps because they are the default on an exchange, not because the product fits the goal. For long-term ownership, spot plus self-custody does the job without a liquidation price.
Underestimating crowd positioning. Open interest and funding together show when a trade is crowded, and crowded trades unwind violently.

When It Matters

Perps explain much of crypto's short-term price behavior, including moves that make no sense from news alone. Understanding them is worthwhile even for people who should never trade them, which is most people. My Trading page covers the discipline side.