A funding rate is a periodic payment between long and short traders in perpetual futures. Venues use it to keep the perpetual contract price anchored near the underlying spot or index. When the perp trades rich to spot, funding is usually positive and longs pay shorts. When the perp trades cheap, funding is often negative and shorts pay longs.
Why it matters
Funding is the carry cost of holding a leveraged directional bet with no expiry. A position can be right on direction and still lose money if funding stays expensive against you for long enough. Crowded trades often show up here before they show up in a clean spot chart. Extreme positive funding says longs are paying up to stay long. Extreme negative funding says shorts are paying to stay short.
Desks watch level, persistence, and divergence across venues. A one-hour spike can be noise. Days of elevated funding with rising open interest is a positioning clue. Funding alone is not a timing signal. Combined with liquidation maps, basis, and spot flows, it helps separate genuine demand from levered overcrowding.
Remember venue mechanics differ. Payment intervals, interest-rate components, and clamps vary. Always read the product docs for the venue you trade. Comparing Binance funding to a smaller book without checking interval length is comparing different clocks.
Simple example
You hold a long perpetual for a week while funding stays firmly positive. Each funding interval, you pay shorts. Even if the mark price barely moves, your equity drifts down. That drag is the market charging you for crowded long exposure. If funding flips negative and stays there, the same long starts collecting payments instead.
Funding also interacts with basis trades. When cash-and-carry desks are active, they can pin funding near a fair carry rate. When they step away, funding can swing harder and leave directional traders paying more for the same view.
Related terms
See perpetual futures, liquidation, open interest, and market structure. Browse more in the crypto glossary.