Reading funding rates
هذا الدليل متاح حاليًا بالإنجليزية. ستتوفر الترجمات لاحقًا.
Perpetual swaps (perpetual futures) have no expiry date. Without a mechanism to tether them to the spot market, the contract price could drift. Funding is the common mechanism: on a fixed schedule, one side of the market pays the other. The rate can be positive or negative, and it can change from interval to interval.
This guide explains the usual design and how to read a funding print as information, not as a command. Venue formulas differ. This is not financial advice and not a description of every contract.
The basic transfer
On many crypto venues, when the funding rate is positive, longs pay shorts. When it is negative, shorts pay longs. Payments are typically exchanged at set times (for example every eight hours, or more often). The amount a trader pays or receives is roughly:
notional position size × funding rate × (time in the interval, if they did not hold the full window)
Exact rounding, caps, and whether the payment uses a time-weighted average of the premium all depend on the contract specs. Some venues cap extreme rates; some have moved to a one-hour schedule. Always open the product’s specification.
The point of the transfer is to make it costly, over time, to lean too hard on the popular side when the perpetual trades rich or cheap versus the index. It is not a guarantee that the perpetual will snap back to spot.
Premium, index, and the printed rate
A typical formula mixes:
- a premium (perpetual versus an index of spot prices), often averaged over the interval,
- an interest-rate component in some older designs (a fixed offset meant to reflect the two currencies in the pair),
- clamps or moving averages so that a one-second spike does not set the whole payment.
The number you see as “current funding” or “predicted funding” may be a forecast of the next payment, a live estimate, or the last settled rate. Interfaces are not consistent. Hover or tap until you know which.
Because the payment is periodic, a large rate on a small interval can still be a modest dollar amount, and a modest-looking rate held for many days can be material. Convert the printed rate into an approximate daily or weekly cost on your notional if you want to know what holding would have cost recently. That is hindsight, not a forecast.
What a crowded rate can suggest — and what it cannot
A persistently high positive rate means longs have been paying shorts. That often coincides with a perpetual trading above its index and with a market that has been eager to be long. A deeply negative rate is the opposite: shorts have been paying, and the contract may have been under pressure or used as a hedge.
Traders sometimes treat an extreme rate as a contrarian signal (the crowded side will be forced to squeeze). Sometimes an extreme persists, or becomes more extreme, while price continues in the same direction. Funding is a description of recent positioning costs, not a timer.
Related context helps, and still does not settle the future:
- Open interest rising with a one-sided rate can mean fresh leverage is being added, not just a few stubborn positions.
- Liquidation clusters can sit behind a crowded side (see Liquidations explained).
- Spot versus perpetual basis should be consistent with the story the rate is telling; if it is not, you may be looking at a stale UI or a different index.
Practical implications for holders
If you hold a perpetual for more than a few minutes, funding is part of the cost (or a small credit). A scalp that accidentally becomes an overnight hold can cross a funding timestamp. A “cheap” leveraged long in a booming market may be expensive to keep.
Hedgers sometimes hold a short perpetual against spot. In that case, funding received or paid is part of the hedge cost, not “free income.” When rates are extremely negative, a lot of other people may already be running a similar short, and squeeze risk is a real mechanical concern.
Limitations of public data
Aggregated “average funding” charts mix venues and contracts. A rate on a thinly traded isolated-margin perp is not the same object as the rate on a flagship USDT-margined contract. Historical rates are also not a strategy: many apparent edges disappear after fees, after you account for the times you would have been liquidated, or after the venue changes the formula.
If you follow funding at all, follow the contract you actually use, read how that venue defines the next payment, and treat extremes as a reason to re-check position size and liquidation distance — not as a reason, by themselves, to enter a trade.
This article is for information only and is not financial, investment, or trading advice. Perpetual contracts are leveraged products and can result in the loss of all capital.