Funding fees explained: the silent P&L leak in crypto perps

Perpetual futures have no expiry — funding is the mechanism that keeps their price tied to spot. It’s also a real, recurring cost that most traders never attribute to their positions. Here’s how it works and how to find out what it has actually cost you.

What funding actually is

A perpetual contract never settles, so exchanges use funding payments to pull its price toward the index: when the perp trades above spot (funding positive), longs pay shorts; when it trades below (funding negative), shorts pay longs. On Binance, Bybit and OKX this exchange happens typically every 8 hours; on Hyperliquid it accrues hourly. The payment is the funding rate times your notional position value — not your margin.

Why it hurts more than it looks

Rates like 0.01% sound negligible. Leverage is what turns them into a leak, because funding is charged on the full position size:

• Hold a $100,000 notional long at +0.01% per 8 hours → $10 per payment, $30/day, roughly 0.9% of notional per month.
• At 10× leverage that’s 9% of your margin per month — your position must appreciate that much just to break even on funding.
• In hot markets funding spikes far above the base rate. Crowded longs paying 0.05–0.1% per interval bleed several percent of notional per week.
• It compounds silently: funding hits your balance, not your trade’s P&L line, so the position that “won” $500 may have paid $700 to stay open — and most journals never connect the two.

The mistake almost every spreadsheet makes

Trade exports don’t include funding — it lives in a separate transaction ledger. So spreadsheet P&L is usually gross of funding, quietly overstating results. For swing traders holding perps for days, funding routinely decides whether a strategy is actually profitable. The same applies to fees: a scalping strategy that looks great gross can be a net loser once taker fees and funding are attributed.

How to see your real funding cost

JuiceTracker syncs every funding payment from Binance, Bybit, OKX and Hyperliquid as a first-class record — attributed by symbol and account, with a Total Funding stat and a P&L mode that shows results net of fees and funding. That’s the number that matches what actually lands in your wallet.