Funding rate: how perpetual futures track spot

The Tether Between Perp and Spot

Perpetual futures—the dominant derivatives product in crypto—have no expiry date, unlike traditional futures. Without expiry, there is no natural mechanism forcing the contract price to converge with the spot price. The funding rate solves this by making longs and shorts pay each other periodically based on how far the perp trades from spot.

The mechanic is simple. When the perpetual trades above spot—a sign of bullish positioning—longs pay shorts. When it trades below spot, shorts pay longs. Payments happen every eight hours on most exchanges. The rate is usually a small fraction of a percent, but during euphoric or panicked markets it can climb high enough to be a meaningful drag on a leveraged position.

Funding rates are also a popular sentiment gauge. Persistently positive funding means traders are crowded long and willing to pay for the privilege—often a contrarian signal that a pullback is overdue. Sharply negative funding suggests the opposite. Some yield strategies, called cash-and-carry trades, deliberately go long spot and short perp during high-positive-funding regimes to capture the funding stream while remaining market-neutral.