Open Interest, Volume, and Funding
How three market metrics reveal different parts of a perpetual market's positioning and activity.
Price tells you where a market trades. Open interest, volume, and funding describe different parts of what is happening underneath that price.
Open interest measures outstanding perpetual exposure. Volume measures how much trading occurred over a period. Funding measures the relative cost of holding long or short exposure.
Volume measures turnover
Trading volume is the notional value exchanged during a period. High volume can come from new positions, position closures, arbitrage, liquidations, market making, or repeated short term trading.
This is why volume alone cannot tell you whether leverage is building. A market can trade enormous volume while total open positions remain almost unchanged.
Volume is most useful for understanding activity and liquidity demand. It also helps evaluate how much trading a venue or market handles relative to its visible depth.
Open interest measures risk that remains open
Open interest is the notional amount of perpetual exposure still outstanding. Every perpetual position has a long and a short side, so open interest is not a simple count of bullish traders minus bearish traders.
Rising open interest means more exposure remains open after trading. Falling open interest means exposure is being closed or reduced.
The combination with price can add context. Rising price and rising open interest can indicate new risk entering the market. Rising price and falling open interest can be consistent with shorts closing. Neither interpretation is a mechanical trading rule because the underlying flows can be more complex.
Funding measures relative demand for one side
Funding transfers value between long and short positions to keep the perpetual linked to its reference market.
Sustained positive funding usually means long exposure is expensive relative to short exposure. Sustained negative funding indicates the opposite.
A very high rate can attract basis traders and arbitrageurs. It can also remain elevated when directional demand is strong enough to keep paying the cost.
Reading all three together
Suppose price rises while open interest rises, volume expands, and funding becomes strongly positive. That describes a market where new leveraged exposure is building and long demand is increasingly expensive.
Now suppose price rises on high volume while open interest falls and funding moves toward neutral. That can describe a market where positions are being closed aggressively rather than a fresh wave of leveraged longs.
These are market descriptions, not guaranteed forecasts. They help identify the structure behind a move and the cost of maintaining current positioning.
Liquidity still matters
A market can have high open interest but thin executable depth. That becomes dangerous during forced deleveraging because a large amount of outstanding risk may need to exit through a relatively small book.
For that reason, open interest should be read with spread, depth, and market impact, especially during volatile periods.
Continue reading
Read Why Funding Rates Turn Positive or Negative for the deeper funding signal and Open Interest vs Volume vs TVL vs Stablecoin Balances for a broader market data comparison.