Perpetual Futures Funding Rates: Direction, Calculation, and Costs

Summary

The document explains funding in perpetual futures as a periodic transfer between long and short position holders. A positive rate generally means longs pay shorts, while a negative rate means shorts pay longs. This mechanism is intended to keep perpetual prices near an underlying spot index. The article distinguishes funding transfers from exchange trading fees and notes that settlement intervals differ by contract. It also describes possible timing delays around a settlement and says the amount collected can be constrained by available margin and counterparty deductions.

Its calculation example combines an average premium index with a bounded interest adjustment, scales the result according to settlement frequency, and applies pair-specific rate limits. The interest input is stated as fixed, while the premium index is calculated from market prices and averaged over time. Funding cost is then based on the rate and position value. The document gives a four-hour TONUSDT example, but offers no independent validation of the formula or empirical evidence about funding’s predictive value. Rates, bounds, and settlement rules may vary by pair and can change, so the article directs readers to current contract details.

Key ideas

• Funding is exchanged between perpetual futures traders to help align contract prices with an underlying index.
• The sign of the rate determines whether longs or shorts generally pay at settlement.
• The calculation uses a premium measure, an interest adjustment, settlement frequency, and pair-specific bounds.
• Funding cost depends on the rate and the position’s value, and is separate from trading fees.
• Settlement timing and margin constraints can affect the amount a trader pays or receives.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.