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Holding a perpetual future can produce funding payments in addition to price gains and losses. The funding rate is an input; the payment is the resulting amount.
Positive and negative rates
In a common structure, positive funding means longs pay shorts; negative funding reverses the direction. Funding is distinct from an ordinary exchange trading fee. Check each product’s formula, settlement time, and limits.
The mechanism helps keep a contract without expiry near spot or an index. Positive funding does not guarantee a decline, and negative funding does not guarantee a rebound.
Convert a rate into an amount
Assume a linear contract has an eligible position value of 10,000 USDT and a funding rate of +0.01% for one settlement. The payment is 10,000 × 0.0001 = 1 USDT. Under the common positive-rate structure, the long pays and the short receives.
These are teaching assumptions. Actual payments depend on valuation price, eligibility time, contract structure, and venue rules. Do not apply the same USDT calculation unchanged to an inverse contract.
Intervals are product-specific
Not every product settles funding at the same interval. Venues can change intervals or limits. Preserve the interval and instrument when comparing observations. Do not mix estimated next-settlement rates with settled historical rates.
Funding is not a trader count
Positive funding may accompany stronger long-side demand, but it does not mean long contracts outnumber shorts: every contract has both sides. Near-zero funding does not establish equal numbers of participants.
Align price and open-interest observations before comparison. Extreme funding alone is insufficient to choose a reversal trade. Keep funding as a cost input separate from funding as a market-state variable in research.
Check P&L with actual costs
After a trade closes, enter actual trading fees and funding to review net P&L.
Sources and documentation
www.bybit.com — Funding-fee-calculation
Continue with common foundations
Position Sizing: Convert a Risk Budget into Order Quantity · Trading Expectancy: Calculate Average Profit and Loss (scheduled) · Open Interest: What an Increase in Contracts Means · Python Price Data Checks: Duplicates, Timestamps, and Returns (scheduled)
Research methods and reporting standards
For education and research. Numerical examples are teaching assumptions unless explicitly identified otherwise. Historical results do not guarantee future performance.