The rate is high because the contract drifted from spot
Funding exists to pull a perpetual back toward spot. It is broadly two components: a **premium index**, measuring how far the contract trades from spot, plus an **interest rate** term.
When enough capital is long and pushes the contract above spot, the premium index rises and funding turns positive and grows. Longs pay shorts, that cost discourages further buying, and the gap converges.
So a funding spike is itself information: **positioning on one side is crowded right now**. It is not the exchange charging you. It is the market pricing crowding.
The part most people miss: the interval shortens
This one is not widely known and its effect is multiplicative.
Venues cap the per-period funding rate. When the rate stays pinned at that cap and the basis has not converged, several venues **shorten the settlement interval for that contract** — from eight hours to four, sometimes to one.
The per-period rate still reads as the cap. But the number of settlements per day goes from three to six, or to twenty-four. What you pay doubles or octuples while the percentage on screen looks almost unchanged.
This is exactly why annualising has to use the contract's **current** interval. Assuming eight hours understates the cost badly in precisely the conditions where cost matters most. The board here infers the interval from historical settlement timestamps for this reason.
Predicted funding is not settled funding
The next-period rate shown in an interface is a **prediction**, extrapolated from the current premium index. It moves with the market and is only fixed at settlement.
During violent moves the prediction and the settled figure can differ substantially. When a frightening number appears, establish first whether it has settled.
New and illiquid contracts swing hardest
On a freshly listed contract, or a thin one, a modest amount of capital moves the premium index, so funding is far more volatile than on major pairs.
Annualised funding on those contracts often looks extraordinarily attractive. The same thinness means worse slippage getting in, more difficulty getting out, and a rate that may reverse before your position is even built.
What it does to an open position
Funding is debited from margin at every settlement. After a few days your actual margin is no longer what you opened with, **and your liquidation price has moved with it**.
Holding size through a high-funding period is a slow, unannounced reduction of your margin. Nothing notifies you; it shows up in the liquidation price.
How to read it
- A spike is a crowding signal, not a malfunction
- Check whether the interval has been shortened; that decides the real multiple
- Separate predicted funding from settled funding
- Recheck the liquidation price periodically, because funding keeps removing margin
- If the plan is to collect this rather than pay it, understand the real cost of the cross-venue trade first
- What funding carry actually costs
Note
Funding moves constantly, so any specific figure is stale on arrival — use the live board. This describes mechanics and is not investment advice.
