How to Read Funding Rates and Open Interest

A funding rate is a periodic payment exchanged between traders holding long and short positions in perpetual futures contracts. When the rate is positive, longs pay shorts; when it is negative, shorts pay longs. The mechanism exists to keep the price of a contract with no expiry date close to the spot price of the underlying asset.

Open interest is the total value of all futures contracts that are still open. Funding tells you which side of the leveraged market is more crowded; open interest tells you how much leveraged money is committed. Read together, they give a useful picture of conditions in the derivatives market.

Why do perpetual futures have funding?

Traditional futures expire on a set date and settle against the spot price. Perpetuals never expire, so they need another way to stay anchored to spot. When the contract trades above spot, the funding rate turns positive and holding a long becomes more expensive, which pulls the contract price back towards spot. When it trades below, funding turns negative. Perpetual swaps were popularised by BitMEX in 2016 and now account for the bulk of crypto derivatives trading.

Funding is not a fee paid to the exchange; it passes directly between traders. Formulas vary by venue and often combine a premium component with an interest component.

How is a funding payment calculated?

For linear contracts margined in USDT or USD, the basic formula is: Funding payment = Notional position value × Funding rate. It applies to the full size of your position, not to your margin.

Example: you open a $5,000 long using $500 of margin at 10x, and the rate is 0.01%. Your payment for that period is 5,000 × 0.0001 = $0.50. Coin-margined inverse contracts calculate funding differently, so check the product specifications on your exchange.

How often is funding paid?

Many large exchanges apply funding every eight hours, three times a day, while some platforms charge hourly. Always check which interval a rate refers to. On a $10,000 position, 0.01% every eight hours costs $3 a day; 0.01% every hour costs $24. A countdown on the trading screen shows when the next payment is due, and only positions open at that moment pay or receive.

The rate displayed on the trading screen is usually an estimate for the next period and can change before it settles. Your funding history shows what you actually paid or received.

How small rates add up with leverage

Say you hold a $20,000 long and pay 0.02% every eight hours. That is $4 per period, $12 a day and $120 over ten days. If you posted $2,000 of margin, ten days of funding has consumed 6% of it. Because funding is deducted from margin, it also gradually moves your liquidation price closer.

What do positive and negative funding rates mean?

• Positive and rising funding: leveraged buyers dominate; the long side is crowded and expensive.
• Negative funding: the short side is crowded; traders are using leverage to bet on a fall.
• Funding near zero: the derivatives market is roughly in balance with spot.

When very high positive funding persists, a sharp drop can trigger a wave of long liquidations, and the reverse applies to shorts. Funding is still not a directional signal on its own: elevated rates can last for weeks, and the same coin can show different rates on different exchanges.

What is open interest?

Open interest is the total value of futures contracts open at a given moment. Every contract has a buyer and a seller, so open interest measures one side, not longs plus shorts. When a new buyer meets a new seller, open interest rises; when both close their positions, it falls. When an existing position simply changes hands, it stays the same.

That is what separates it from volume. Volume counts trades over a period; open interest measures positions still in the market right now. Our guide to trading volume and liquidity covers the volume side.

How to read open interest with price

Open interest does not point in a direction by itself. It is read against price action, typically like this:

• Price up, open interest up: new leveraged positions are backing the rally.
• Price up, open interest down: the rise may be driven largely by shorts closing, a short squeeze.
• Price down, open interest up: new short positions are being opened.
• Price down, open interest down: longs are closing or being liquidated.

A rapid build-up of open interest means leverage is accumulating in the market. Whichever way the price then breaks, the risk of cascading liquidations and higher volatility increases.

Using funding and open interest together

The clearest picture comes from combining the two. A rising price, fast-growing open interest and high positive funding point to a crowded, expensive long side. A falling price, rising open interest and negative funding suggest shorts are piling in. Make sure the figures you compare come from the same exchange, timeframe and product; aggregator sites that combine several exchanges give a broader view.

Is collecting funding risk-free income?

No. Being on the receiving side of funding does nothing to remove price risk. A long collecting negative funding can lose far more than it receives if the price drops sharply. “Funding arbitrage” strategies that pair a spot holding with an opposite futures position are not guaranteed either: rates can flip, one leg can be liquidated and exchange risk remains.

To work out your real result, record price profit or loss, opening and closing fees and every funding payment separately. With a $150 gain from price, $20 in fees and $45 of funding paid, your net result is $85.

Sources

• Coinbase: Funding Rate and Position Value
• Coinbase International: Funding Mechanism
• Coinbase: Periodic Calculation in Different Products