A funding rate is a periodic payment exchanged between holders of long and short positions in a perpetual futures contract, which keeps the contract's price close to the underlying spot price. When funding is positive, longs pay shorts; when it is negative, shorts pay longs.
How it works
A conventional futures contract expires, and its price converges with the spot price at expiry. A perpetual future never expires, so it needs another mechanism. Funding provides it: when the perpetual trades above the spot index, funding turns positive and longs pay shorts. That makes holding a long more expensive and holding a short more attractive, which pulls the price back toward spot. The reverse happens when the perpetual trades below spot.
- Formula: most venues combine a premium component (how far the perpetual trades from the index) with a small interest-rate component, within caps. The exact formula differs by exchange.
- Interval: many centralized exchanges settle funding every eight hours; Hyperliquid settles every hour.
- Payment: position notional × funding rate. The payment passes between traders; it is not a fee kept by the exchange.
Because intervals differ, rates are easier to compare annualized: rate per interval × intervals per year. An hourly rate of 0.001% equals 0.001% × 8,760 ≈ 8.8% a year; an eight-hour rate of 0.01% equals 0.01% × 1,095 ≈ 11% a year. These are simple, not compounded, figures.
Open interest is the total number of contracts still open. Each contract has a long and a short side, so open interest measures the size of positioning, not its direction. It is often shown in US dollars as contracts × mark price. The same idea applies to options; see open interest.
How to read it
Funding shows which side is paying to keep its position; open interest shows whether positions are being added or closed. Read together with price:
| Price | Open interest | Common reading |
|---|---|---|
| Rising | Rising | New positions opening; the move is backed by fresh leverage |
| Rising | Falling | Shorts covering or longs taking profit; the move comes from positions closing |
| Falling | Rising | New shorts, or longs adding into the decline |
| Falling | Falling | Longs closing or being liquidated |
High positive funding with rising open interest points to a crowded long side. If price then drops, leveraged longs can be liquidated in sequence, accelerating the fall (a long squeeze). Deeply negative funding with high open interest is the mirror image and carries short-squeeze risk.
Funding is also a running cost: at 30% a year, holding a long for a month costs about 2.5% of its notional value.
Worked example (illustrative numbers)
| Item | Value |
|---|---|
| Hourly funding rate | +0.004% |
| Annualized (× 8,760) | About 35% |
| Long position notional | $50,000 |
| Funding paid per hour | $50,000 × 0.00004 = $2 |
| Funding paid over 30 days | About $1,440 |
| Open interest over the week | $1.0B → $1.3B (+30%) |
| Price over the week | +5% |
Longs are paying a steep rate, and open interest grew much faster than price: in coin terms, positions rose about 24% (1.3 ÷ 1.05 ≈ 1.24). Leverage is building on the long side. That does not forecast a decline, but it means a decline could be amplified by forced selling.
Limitations and common mistakes
- One venue is not the market. Each exchange has its own funding and open interest; positioning can differ across venues.
- Dollar open interest rises with price. If price doubles and no new contracts open, dollar open interest still doubles. Check the coin count where possible.
- Funding can stay high. In strong trends, elevated funding can persist for weeks.
- Annualized figures exaggerate brief spikes. One hour at an extreme rate annualizes to a dramatic number that may not last.
- Leverage cuts both ways. Crowding analysis describes risk; it does not time reversals.
In Clear Tape
The Crypto page includes a Hyperliquid perpetuals table for BTC, ETH, SOL and HYPE. It shows the mark price, the 24-hour change, funding annualized from Hyperliquid's hourly rate (× 8,760, not compounded), a plain reading of who pays (longs pay or shorts pay, marked as crowded when annualized funding is 30% or more in either direction), open interest in US dollars (contracts × mark price) and 24-hour volume. Large individual positions are not shown, because Hyperliquid's public data gives positions one account at a time. The table is available to Tools and Pro members, and Clear Tape's Bitcoin support and resistance levels to Pro members; crypto prices and Bitcoin network data are free.
For educational purposes only. Not investment advice.