The difference in one sentence each
- Volume counts every contract that changed hands during a period. It resets every candle.
- Open interest (OI) counts the contracts still open at the end of the period. It carries over from one candle to the next.
Think of a busy shop. Volume is the number of people who walked through the door today. Open interest is the number still inside at closing time. A shop can be packed all day and empty at night, and that is very different from a crowd that stays.
Reading the four combinations
| Volume | OI | What is happening |
|---|---|---|
| High | Rising | New positions are being opened in size. Combined with price direction, this is the strongest signal of commitment. |
| High | Falling | Positions are being closed in a hurry, often a liquidation flush or short covering. Moves are fast but tend to exhaust. |
| High | Flat | Churn: positions are changing hands between traders without new money arriving. Day traders, not a new trend. |
| Low | Rising | Quiet build-up: positions are being added without much trading activity. Often seen before a breakout. |
Add price to the picture and you get the four OI states: rising price with rising OI means new longs, falling price with rising OI means new shorts, and so on.
Two situations that look alike
Example (illustrative): two coins both rise 12% on volume five times their average. On the first, OI rises 18%: new positions funded the move, and pullbacks are likely to be bought. On the second, OI falls 15%: shorts were forced out, and once the covering ends there is nobody left to keep buying. Same price, same volume, very different follow-through.
Spotting liquidation cascades
A liquidation cascade has a clear fingerprint: a volume spike, a sharp price move and a large drop in OI within a few candles. Forced closes are market orders, so volume jumps, and each closed position removes a contract, so OI falls. When OI stops falling, the forced selling or buying is usually over.
Scanning both at once
Committed breakout
Heavy volume, new positions and a price trigger, all at once.
Flush in progress
A crowded side is being cleared out. Wait for OI to stabilise before acting.
See the open interest scanner and the volume scanner for more ready-made scans.
Frequently asked questions
What is the difference between open interest and volume?
Volume counts all contracts traded in a period and resets every candle. Open interest counts the contracts still open at the end of the period and carries over.
Is high volume with falling open interest bearish?
Not necessarily. It means positions are closing quickly. If price is falling, longs are unwinding; if price is rising, shorts are covering. Either way the move often runs out once the closing is done.
Can open interest rise on low volume?
Yes. Positions can be added steadily without heavy trading. Rising OI on quiet volume often means one side is building a position before a move.
Crypto futures are leveraged and carry a high risk of loss. This guide is educational and is not investment advice.