A perpetual has no expiry, so something has to pull it back to spot. That something is a payment out of your account, several times a day.
Dario FennDeFi & Markets Lead · DeFi protocols, yield, market structure and on-chain data
Perpetual futures have no settlement date, so exchanges use a periodic funding payment between long and short holders to keep the contract price anchored to spot. When the perpetual trades above spot, longs pay shorts; when it trades below, shorts pay longs. The rate combines a premium component and a fixed interest component, is usually paid every eight hours, and compounds into a substantial annualised cost on a crowded position.
A dated future converges to spot because it expires. A perpetual never expires, so it needs another mechanism, and that mechanism is a cash transfer between the two sides of the market. Funding is not a fee the exchange charges — it moves between traders — but it leaves your account all the same, and on a popular directional trade it is often the largest cost you pay.
At each funding interval, the exchange compares the perpetual's price against an index of spot prices. If the perpetual is above, longs pay shorts. If below, shorts pay longs. The payment is proportional to position size, not to margin, which matters at leverage: a $100,000 position on $5,000 of margin pays funding on $100,000.
The rate itself typically has two parts. A premium component measuring how far the perpetual sits from the index, and a fixed interest component reflecting the rate differential between the quote and base assets. Most venues clamp the result within a cap and settle every eight hours, though several now use one-hour intervals, which makes the rate more responsive and the accounting more granular.
The economic logic is arbitrage. If longs are paying a large rate, someone can short the perpetual, buy spot, and collect the funding with no directional exposure — the cash-and-carry trade. That flow pushes the perpetual back toward the index, which is exactly what the mechanism is designed to induce.
Funding is quoted per interval, which makes it look trivial. At three eight-hour intervals a day, a 0.01% rate — the common baseline — is roughly 11% a year. A 0.05% rate is around 55%. A 0.1% rate sustained is over 100% annualised.
The arithmetic is: rate per interval × intervals per day × 365. Do it every time before opening a position you intend to hold, because the difference between a trade being viable and being hopeless is often entirely here. A long that needs the asset to rise 3% to break even after two weeks of elevated funding is a different trade from the one you thought you were putting on.
Funding is the cleanest sentiment gauge in the market because it is paid rather than said. Persistently high positive funding means leveraged longs dominate and are collectively paying to stay in; persistently negative funding means the reverse.
Two practical readings. Extended high positive funding across venues marks a crowded long, and crowded longs are what liquidation cascades feed on — the mechanism is described in liquidation cascades. And a sharp flip from positive to negative during a sell-off often marks capitulation rather than the start of a trend, because the people paying to be short arrive last.
Compare across venues, not just on one. Divergent funding between exchanges usually means fragmented positioning rather than a signal, and it is the basis of a large share of professional basis trading. Aggregated views are available on most derivatives data tools.
The cash-and-carry trade — long spot, short the perpetual of the same size — is delta-neutral and collects funding whenever the rate is positive. It is the engine behind several yield products, including the synthetic dollars covered in yield-bearing stablecoins.
The risks are not zero and they are not directional. Funding can turn negative and you begin paying. Your short leg needs margin, and a sharp rally forces you to post more or be liquidated even though the combined position is flat. And the two legs usually sit on different venues, adding exchange and settlement risk to a trade that looks arithmetically safe.
Funding interval — eight-hour versus one-hour changes how quickly the rate responds and when you are charged. The index construction, which determines what "spot" means and how manipulable it is on thin assets. The cap on the rate, which limits both your cost and your income in extreme conditions. And whether funding is charged on unrealised profit as well as principal.
Hyperliquid publishes its funding formula, index composition and interval openly, which is the standard to hold other venues to; the perp DEX ratings score that transparency directly, because a funding mechanism you cannot inspect is a cost you cannot forecast.
Check funding before opening, and check it again before rolling into another day. If the annualised rate exceeds the move you expect over your holding period, the position is paying for itself in the wrong direction, and the trade needs to be shorter, smaller, or expressed with a dated future instead.
Perpetual futures now trade several multiples of spot crypto volume most days. Understanding how perps and funding rates actually work is the difference between using leverage deliberately and being liquidated by it.
A dollar that pays you something is a dollar taking a risk on your behalf. The only question worth asking is which one.
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