In plain terms — Some contracts have no expiry date. At set intervals, the side positioned for a rise may pay the side positioned for a fall, or vice versa: the funding rate determines the direction and amount.
A perpetual is a derivative without the ordinary fixed expiry of a traditional future. A long position benefits when the contract rises, while a short position benefits when it falls. Funding creates an economic incentive intended to keep the perpetual price close to spot or to a reference index, the venue's chosen measure of the underlying market.
How the transfer works
The venue compares the contract with its index and applies the method stated in the specifications. The calculation may include the perpetual's premium or discount, interest components, time averages, dampeners, and caps. Method, frequency, and settlement currency are not the same for every product.
Under the conventions documented by the cited venues, positive funding means longs pay shorts; with negative funding, shorts pay longs. An account history may display the sign from the customer's cash-flow perspective, however. Read the venue's legend rather than infer direction from an interface color.
Amount, position, and interval
Many venues describe the amount as N × f, where N is the
notional value permitted
by the specification and f is the rate for that interval. The value may
depend on quantity, multiplier, and mark price—the internal reference used
for calculations such as margin or liquidation—as well as contract currency.
The venue's operational formula takes precedence over this general
representation.
The interval must be checked for each contract. Official documentation shows, for example, hourly settlement at one venue and every eight hours at another. Some models include only positions open at the funding timestamp. Treating one of these examples as a rule for all perpetuals would be incorrect.
Leverage does not necessarily change the notional used for funding. For the same position, less margin nevertheless makes the same debit larger relative to committed capital and can bring a liquidation threshold closer.
Verification procedure
- Open the contract specification and identify its index, mark price, formula, interval, and currency.
- Record the position, notional, and final rate at the relevant time, separate from any predicted rate.
- Determine the paying side from the sign convention stated by the venue.
- Compare the estimated amount with the debit or credit in account history and flag any difference.
Repeated positive funding can reduce a long's result even if price is unchanged; for the short, under the same conditions, it can be a credit. The rate can reverse before the next interval. Future funding is therefore an uncertain cost or receipt, not a promised coupon.
Funding is distinct from execution commissions. A venue may state that the transfer occurs directly between the two economic sides while charging its trading fees separately. The concrete accounting method depends on the contract and clearing arrangement.
Technical depth: comparing rates and carry strategies
Before comparing two rates, normalize the unit: per-interval, hourly, and annualized rates are not interchangeable. Also distinguish a predicted rate from the final rate, and verify whether the interface uses simple interest, compounding, or a venue-specific annualization convention.
High funding alone does not prove that a market is excessively long or short and is not an entry signal. It reflects the venue's method, the difference from the reference, and conditions observed at that time; it can change without a position being closed.
Carry strategies seek to collect a difference, often by pairing a perpetual with another leg. They are not risk-free: variable funding, leg mismatch, spread, slippage, commissions, liquidation, collateral moves, index risk, and venue risk can exceed the expected transfer.
Limitation — Funding is a variable contract rule, not a guaranteed yield or protection from liquidation. Always consult the specifications and history of the applicable venue.
Sources
- BitMEX, Perpetual Contracts Guide — official documentation of the mechanism's purpose, sign, notional base, timestamp settlement, and transfer between long and short sides.
- Coinbase, Funding rates — International Derivatives — official venue documentation of hourly settlement, payment direction, and a notional-based calculation.
- Coinbase, US Perpetual-Style Futures Funding Rate Mechanism — official example of a different method based on periodic comparison between futures and spot prices.
- Coinbase International Exchange, Risk Disclosures — official disclosure of funding, leverage, liquidation, and venue risks.