Futures Funding Rate Calculator

A perpetual futures contract never expires, so it needs a mechanism to keep its price tethered to spot. The funding rate does that job: at each settlement, holders of one side pay the other a fraction of notional. A positive rate means longs pay shorts, which happens when the contract trades above the index; a negative rate means the reverse. The payment equals position size times the rate, applied at fixed intervals, most commonly every eight hours for three payments per day. The rate itself combines a fixed interest component, typically 0.01 percent per eight hours on major venues, with a premium index measuring the gap between contract and mark price, then clamped to an exchange-defined cap. Costs compound faster than the headline number suggests. A 0.01 percent rate paid three times daily annualizes to about 10.95 percent of notional, and 0.05 percent annualizes to roughly 54.75 percent. Because funding is charged on notional rather than on margin, a trader at 10x leverage pays ten times that rate measured against their own capital. Two caveats apply to any projection. Funding is owed only by whoever holds the position at the settlement timestamp, so entering just after settlement avoids that payment entirely. And rates are set by market imbalance and can flip sign within hours, so a sustained rate above about 0.05 percent per interval signals crowded leverage that often precedes liquidation cascades.

The design was proposed years before crypto existed. Robert Shiller, writing in 1992 on measuring asset values for cash settlement in derivative markets, described a perpetual claim held to an index by a periodic cash payment, intended for illiquid assets such as real estate where a conventional futures curve could not be maintained. The idea saw no widespread implementation until crypto exchanges needed a contract that retail traders could hold indefinitely without rolling expiries. BitMEX launched the perpetual swap on Bitcoin in 2016 with eight-hour funding, and the format spread across the industry after Binance Futures opened in September 2019, with Bybit, OKX and others adopting the same interval and a similar interest-plus-premium formula. Variations followed. dYdX moved to hourly funding to blunt the incentive to trade around fixed timestamps. Exchanges added rate caps, tiered maintenance margin and insurance funds to contain the liquidations that extreme funding periods produce. The data itself became an analytic staple, with aggregators such as Coinglass publishing cross-exchange rates that traders read as a leverage and sentiment gauge, while basis traders harvest the spread using delta-neutral spot-versus-perpetual positions.