What funding rates are and why they exist

A funding rate is a small, recurring payment exchanged between traders holding opposite sides of a perpetual futures contract. It exists to keep the perpetual’s price tethered to the underlying spot price, replacing the role that an expiry date plays in an ordinary future. Nobody sets it as a fee; it is calculated from the gap between the contract and spot.

This article explains what funding is, why it exists, and how it is calculated at a mechanical level. It is educational only and is not trading advice; it does not suggest that positive or negative funding is a reason to take any position.

The problem funding solves

An ordinary futures contract has an expiry date. As that date nears, the contract price and the spot price converge, because on expiry the contract settles against spot. That convergence is what stops a future from drifting far from the real market and staying there.

Perpetual futures deliberately have no expiry, which removes that anchor. Left alone, a perpetual could trade persistently above or below spot with nothing to pull it back. Funding is the substitute anchor: it makes it costly to sit on whichever side is pushing the contract away from spot, creating a continuous incentive that nudges the price back into line.

How the payment flows

Funding is a transfer between the two sides of the contract, not a payment to the exchange. The direction depends on where the perpetual is trading relative to its spot-linked reference:

• Perpetual above spot → positive funding. Longs pay shorts. Being long costs a little each period, which discourages pushing the price higher and encourages shorts.
• Perpetual below spot → negative funding. Shorts pay longs. Being short costs a little, which discourages pushing the price lower and encourages longs.

On major venues such as Binance and Deribit, funding is typically exchanged every eight hours, though the interval and exact formula vary by exchange. The payment is calculated on the position’s notional value, so a larger position pays or receives proportionally more.

What goes into the rate

Most exchanges build the funding rate from two ingredients, then combine them:

• The premium (or basis) component. This measures how far the perpetual is trading above or below an index of spot prices. A larger gap produces a larger funding rate in the direction that closes the gap.
• An interest-rate component. A small baseline reflecting the cost of holding the quote versus the base currency. On many venues this is a fixed, modest figure and the premium does most of the work.

Exchanges also usually clamp the rate within a maximum and minimum so a single volatile period cannot produce an extreme payment. Because the specifics differ, the exchange’s own documentation — for example Binance’s or Deribit’s published funding methodology — is the authoritative source for any given contract.

A simple, illustrative example

These figures are invented to show the arithmetic, not real market data.

• Suppose a trader holds a long position with a notional value of 10,000 units, and the funding rate for the upcoming period is +0.01%.
• The funding payment is 0.01% of 10,000 = 1 unit. Because the rate is positive, this long trader pays 1 unit to the shorts at the funding timestamp.
• If the rate had been −0.01%, the same trader would instead receive 1 unit from the shorts.

Note two things. First, funding is charged on the whole notional, so leverage magnifies its effect relative to your margin. Second, funding is paid only if you hold the position across the funding timestamp; a position opened and closed entirely between timestamps typically pays no funding.

How to read funding without over-reading it

Funding is often described as a “sentiment” indicator, and there is a grain of truth: persistently positive funding means the perpetual is trading above spot, which usually means more aggressive demand from longs. But treat this carefully:

• Funding tells you about the contract’s price relative to spot, not about where the price will go next. It is a description of the present, not a forecast.
• Extreme funding can reflect crowded positioning, which can precede sharp moves in either direction — but the rate itself is not a signal to act, and this article does not offer one.
• Funding is a real, recurring cost. Over many periods it can add up to a meaningful drag or credit that is entirely separate from price movement.

Why funding and the “basis” are two views of the same thing

The basis is the gap between a derivative’s price and spot. For a dated future, the basis shrinks to zero at expiry. A perpetual has no expiry to close the basis, so funding does the job continuously: a positive basis (perpetual above spot) produces positive funding that pressures the basis back down, and a negative basis produces negative funding that pressures it back up. In other words, funding is the price the market charges to hold the basis open. When you see persistent positive funding, you are really seeing a persistent premium of the contract over spot — and the funding is the mechanism working to erode it. Neither figure tells you where price goes next; both describe the tension between the contract and the underlying at this moment.

The arbitrage that keeps funding honest

Funding is not just a rule an exchange imposes; it is enforced by traders acting on incentives. When funding is strongly positive, a market-neutral participant can, in principle, hold spot and short the perpetual to collect funding while carrying little directional exposure — a “cash-and-carry” style position. That behaviour adds selling pressure to the expensive perpetual and buying pressure to spot, which narrows the gap and pulls funding back toward normal. The reverse works when funding is deeply negative. This is described here only to explain why funding tends to self-correct; it is not a strategy recommendation, and such positions carry their own execution, counterparty, and liquidation risks. The takeaway is that funding is a live equilibrium maintained by many participants, not a static fee schedule.

The risks connected to funding

• Accumulating cost. Holding a position on the paying side through many periods can erode equity even if the price barely moves.
• Interaction with leverage and liquidation. Funding payments reduce margin. On a highly leveraged position, funding outflows can nudge equity toward the maintenance threshold and closer to liquidation.
• Venue differences. Because each exchange defines its own interval, clamps, and index, the same nominal position can incur different funding on different venues.
• Timing effects. Because funding is charged only across the timestamp, the exact moment you hold a position matters. Two traders with identical views can pay very different funding simply because of when their positions were open relative to the funding clock.

These are mechanical realities of the contract, not warnings for or against using it. The point is that funding is a genuine, recurring cash flow with its own rules, and any honest picture of holding a perpetual has to account for it alongside the price move itself.

What this means

Funding rates are the clever fix that lets a never-expiring contract still track the spot market: a small payment between traders that makes the “expensive” side pay the “cheap” side, nudging the perpetual back toward spot every few hours. Understanding it means seeing it as a mechanism, not a message — it describes the gap between contract and spot, it is a genuine cost that compounds over time, and it interacts with leverage and liquidation. For the wider picture, see how perpetual futures are built and how liquidations cascade when leveraged positions are forced closed.