Why funding exists
A traditional future converges toward its underlying price as expiry approaches. A perpetual has no expiry, so venues use recurring funding payments to encourage its traded price to remain near the index.
When long demand pushes the perp above the index, positive funding makes long positions more expensive and rewards shorts. The reverse can happen when short demand dominates.
Estimating a payment
Funding is generally calculated from the notional value of the open position. A $10,000 position at a 0.01% funding rate produces an estimated $1 payment for that funding interval.
Using 10× leverage does not reduce that $1 to ten cents: the rate still applies to the $10,000 position, even if only $1,000 of collateral supports it.
Positive and negative rates
At a positive rate, longs normally pay and shorts receive. At a negative rate, shorts normally pay and longs receive. A displayed annualized percentage should not be confused with the actual payment for one interval.
Check the venue’s next funding time, interval, caps, and calculation method before holding a position through settlement.
Funding is not a directional signal
A high positive rate can indicate crowded long positioning, but it does not prove that price will fall. Strong markets can remain crowded for extended periods.
Treat funding as a measurable carrying cost or income stream - not a standalone forecast.
Separate the displayed rate from the cash flow
A rate must be read together with its interval, sign convention, settlement time, and notional base. The CFTC describes funding as a periodic transfer whose direction and magnitude generally reflect the gap between the perpetual and spot reference prices. Provider formulas can then add premiums, caps, floors, or delayed settlement rules.12
A useful audit is to calculate one interval in currency, then stress several intervals at a higher and lower rate. Do not multiply the latest observation into a yearly forecast without labeling that extrapolation. Funding can reverse sign, and a position may close before the next assessment.24