Choose which two positions the ledger represents
This page studies cash flows rather than forecasting the next funding rate. The examples use linear contracts quoted and settled in USDT, with quantity expressed in BTC. One BTC of contract exposure changes by one USDT for each one-USDT price move. Contract counts must first be converted using the exchange multiplier.
- A perpetual short is a derivative position; do not invent a spot-coin borrow charge for it. Add borrow costs only where an actual loan exists, including borrowed collateral.
- Inverse contracts and collateral in a different currency require different payoff, funding and currency-conversion formulas. The linear USDT arithmetic below cannot be copied into them unchanged.
| Structure | Funding receipt sought | Additional exposure |
|---|---|---|
| Buy spot, short perpetual | Positive funding received by the short | Spot purchase capital, perpetual margin, basis changes and custody risk; financing applies if cash is borrowed. |
| Long perpetual A, short perpetual B | Funding received on B less funding paid on A | Two settlement schedules, two margin accounts, venue price divergence and asynchronous fills. |
| Short borrowed spot, long perpetual | Negative funding received by the long | Spot borrow availability, variable borrow interest, collateral and forced repayment. |