What Is a Funding Rate? The Recurring Cost of Holding a Perpetual

The formula, and who actually receives the money

Funding payment = position notional × funding rate, settled at each funding timestamp. Notional means the full size of the position, not the margin you posted: a 5 BTC long at $60,000 has a notional of $300,000 whether you funded it with $300,000 or with $15,000 at 20x. The rate itself is usually built from two pieces — an interest-rate component, often fixed at a small constant, plus a premium index that measures how far the perpetual has traded from the spot index over the interval, with the whole thing clamped to a maximum such as ±0.05 percent per interval on major pairs. You do not need to reconstruct the venue's exact formula to plan; you need to know that the rate is published in advance of each settlement and that you can read it before you open.

The money does not go to the exchange. It moves from one side of the book to the other: when funding is positive, every long is debited and every short is credited at the same timestamp, in proportion to notional. That is what makes the mechanism work as a tether to spot — when everybody piles into longs, the perpetual trades above the index, the rate goes positive, and holding a long starts costing money until enough people leave or enough arbitrageurs step in to sell the perpetual and buy spot. Understanding that it is a transfer also tells you what a persistently positive rate means: it is a live measure of how crowded and how leveraged one side of the market currently is.

Small rate, long hold, large bill

Take the standard 0.01 percent per eight hours on a $10,000 notional position. Each payment is $1. Nobody notices $1. After thirty days you have made 90 payments and paid $90, or 0.9 percent of notional. After six months, $547.50. After a year, $1,095 — 10.95 percent of the position, and that is before a single trade has gone against you. The intuition that fails here is the same one that fails on subscription costs: a charge small enough to ignore individually is not small in aggregate, and the aggregate is what your account balance sees.

Leverage makes the same rate hit far harder, because funding is charged on notional while your risk of ruin is measured against margin. That $10,000 notional at 10x uses $1,000 of your money, so $1,095 of annual funding is 109.5 percent of your margin — you would lose your entire stake to funding alone inside a year with the price completely unchanged. At 20x it is 219 percent, and the position dies of funding in under six months. This is why perpetuals are structurally short-horizon instruments: at high leverage the funding clock is a second liquidation mechanism running alongside the price one, and only the price one has a number displayed on the screen.

Reading the rate before you open, and what a negative one means

Before opening, multiply the current rate by three, by the number of days you expect to hold, and by your notional. That single line tells you what the trade costs before it does anything. A three-day swing trade at 0.01 percent on $10,000 costs $9 — irrelevant next to the position's price risk. The same trade held for four months costs $360, which will be a visible fraction of whatever you make. If the rate is at the cap because the market is euphoric, a long is paying the maximum precisely when the crowd is most one-sided, which is exactly the moment the position is least likely to be comfortable.

A negative rate flips the sign: shorts pay longs, and a long is being paid to hold. That is real income and it is what cash-and-carry desks harvest, holding spot and shorting the perpetual — or the reverse when the rate is negative — to collect the transfer while carrying no directional exposure. But two cautions. First, funding is not a free yield: the leg you are paid on still carries execution cost, exchange risk and, if the hedge is imperfect, basis risk. Second, the rate changes every interval and can flip within a day, so an annualised figure is a snapshot, not a forecast. The table above annualises current rates so you can compare them; it does not promise that any of them will still be there tomorrow.

Frequently asked questions

Does the exchange keep the funding payment?

No. Funding is a transfer between traders: longs pay shorts when the rate is positive and shorts pay longs when it is negative, in proportion to each position's notional. The exchange earns its money from trading commissions, which are charged separately at open and close. That distinction matters because it explains what the rate is for — it is the incentive that pulls the perpetual's price back toward the spot index, not a service charge.

Do I pay funding if I close before the settlement time?

On most venues, no: funding is charged on the position you hold at the timestamp itself, so a position opened and closed between two settlements pays none. That is why order flow clusters around funding times when the rate is large. Do not build a strategy on it, though — the trading commissions you pay to dodge one payment can easily exceed the payment, and rules differ by venue, so check the contract specification rather than assuming.

Is a high funding rate a signal to trade against the crowd?

It is evidence of positioning, not a timing signal. A sustained rate at the cap does say that one side is crowded and paying dearly to stay there, and crowded positioning has historically unwound violently. But rates can stay extreme for weeks while the trend continues, and being early on the other side means paying the same funding while you wait. Use it as one input into whether a position is worth its carry, not as a reason to take the opposite side.