A perpetual future has no expiry, so nothing forces its price back to spot. Funding is the mechanism that does it: a payment between longs and shorts, every few hours, that makes holding the crowded side expensive.
When the perpetual trades above spot, funding is positive and longs pay shorts. When it trades below, funding is negative and shorts pay longs. On Binance and Bybit the payment happens every eight hours. The number you see quoted is the rate for one of those intervals, not an annual figure — 0.01% is the neutral resting rate, which works out at about 11% a year if it never moved.
Funding is the cleanest read on which side is crowded, because it is paid in real money rather than surveyed. Persistently high positive funding means leveraged longs are paying to stay in, and every hour that continues raises the cost of holding. That is what makes an over-funded market fragile: it does not need selling to unwind, it only needs the longs to stop being willing to pay.
The useful signal is rarely the absolute level. It is the change — funding that has been climbing for a day tells you positioning is building, and funding that flips sign tells you it has already unwound.
Around 0.01% is neutral. Above 0.05% per interval is crowded. Above 0.1% is unusual and tends not to last, either because price corrects or because the rate itself pulls new shorts in. Negative funding is less common and often marks capitulation rather than opportunity.
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Per-interval funding on Binance perpetuals, Bybit where Binance has no listing. Sorted highest first — these are the most expensive longs on the board. Full table on the trend scanner.