Perpetual futures are the most widely traded instrument in crypto derivatives, and understanding how they work is essential before putting any capital behind one. A perpetual future is a contract that lets you take a leveraged position on an asset's price without ever owning the asset and without a fixed expiry date. That combination — leverage plus no settlement date — is what makes perpetual futures both flexible and easy to misuse.
Contracts with no expiry
A traditional futures contract has a settlement date. On that date the contract expires, and if you want continued exposure you must roll into a new one. Perpetual futures remove that step entirely. There is no expiry, so a position can stay open for as long as you choose to hold it and can meet its margin requirements. This is the single most defining feature of the instrument.
Removing the expiry solves a practical annoyance but introduces a design challenge. Expiry is what normally forces a futures price to converge with the spot price of the underlying. Without it, the contract price and the spot price could drift apart indefinitely. Perpetual futures need a different mechanism to keep the two aligned, and that mechanism is funding.
The funding mechanism
Funding is the tether that keeps a perpetual's price close to the underlying market. It works through periodic payments exchanged directly between traders on opposite sides of the trade. When the contract trades above spot, longs pay shorts; when it trades below, shorts pay longs. The payment scales with position size and is settled at regular intervals.
The effect is a self-correcting pressure. Paying to hold the crowded side makes that side less attractive and rewards taking the other, which nudges the contract price back toward spot. No central authority sets the price directly; instead the funding flow leans on trader incentives to keep the perpetual honest. For anyone holding a position across intervals, funding is a genuine recurring cost or credit worth planning around, not an afterthought.
Because funding responds to the balance between longs and shorts, its direction and size shift over time. That makes it both a cost to manage and a rough read on how positioning is leaning — though, as with any single indicator, it describes the present balance rather than predicting the next move.
Margin, leverage, and liquidation
Perpetual futures are traded on margin, meaning you post collateral to control a position larger than that collateral alone. This is leverage, and it cuts both ways: it amplifies gains and losses in equal measure. A modest move in the underlying can translate into a large move in your account, which is precisely why leverage demands respect rather than enthusiasm.
