Funding rates and basis trades: costs, crowding and carry

Calculate actual funding cash flows, compare intervals fairly and evaluate two-leg or settlement strategies after costs and margin risk.

Course outline

1. 1

   Calculate funding payments over your actual holding window

   Build a settlement-by-settlement funding ledger from position notional and signed rates. Keep funding separate from margin, trading fees and price P&L.

   8 min

   In short: For a linear perpetual, funding at each settlement is −N × r for a long and +N × r for a short, with N the position notional and r the settled rate; a positive rate makes longs pay shorts. Sum every settlement actually crossed and add fees and price P&L separately.

2. 2

   Compare hourly and eight-hour funding on equal terms

   A 0.005% hourly rate costs twice as much as 0.02% every eight hours. Normalise funding to one horizon and keep snapshot APR apart from account returns.

   8 min

   In short: Compare funding rates on one horizon: daily rate = r × 24 ÷ h and simple annual rate = r × 24 ÷ h × 365. So 0.005% hourly is 0.12% per day, twice the 0.06% of 0.02% every eight hours. Simple APR is a snapshot comparison, not a return on collateral.

3. 3

   Distinguish crowded positioning from a squeeze

   Use funding and open interest as context for crowded positioning. Require an adverse price move and forced-flow evidence before calling it a squeeze.

   8 min

   In short: Crowding is a vulnerable positioning context, such as unusual funding relative to its own history with rising open interest. A squeeze is the process in which an adverse price move pressures positions to close; for a short squeeze, price rises against shorts, and contracting OI with rising short liquidations supports the explanation.

4. 4

   Build the full ledger for a spot–perpetual basis trade

   Calculate both legs, basis change, funding and fees of a spot–perpetual basis trade. Stress a widening basis and margin needs before calling the hedge low risk.

   9 min

   In short: In a spot–perpetual basis trade with matched quantity, price P&L equals initial basis minus final basis, where basis = F − S. Net result adds signed funding and subtracts costs on both legs, in the example 250 + 60 − 100 = 210 USDT; basis widening and collateral needs remain risks.

5. 5

   Test a funding-settlement trade after all costs

   Opening just before funding and closing just after looks easy. A 30 USDT receipt cannot cover 100 USDT of fees and slippage even before price moves.

   8 min

   In short: A funding-settlement trade profits only if the funding receipt exceeds fees, adverse execution and price P&L. A 0.03% receipt of 30 USDT on a 100,000 USDT short, minus 80 USDT of fees and 20 USDT of execution cost, leaves −70 USDT even if price does not move.

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1. Calculate funding payments over your actual holding window
2. Compare hourly and eight-hour funding on equal terms
3. Distinguish crowded positioning from a squeeze
4. Build the full ledger for a spot–perpetual basis trade
5. Test a funding-settlement trade after all costs

Educational material. Examples do not establish a profitable strategy. Trading costs, gaps and liquidation can produce losses beyond a planned stop.