What open interest actually is
Open interest (OI) is the total number of futures contracts that are open right now — positions that have been opened and not yet closed. Every contract has two sides, a long and a short, so OI counts contracts, not buyers or sellers.
It changes in only three ways:
- A new buyer and a new seller open positions → OI goes up.
- An existing long and an existing short both close → OI goes down.
- One side hands its position to a newcomer (an old long sells to a new long) → OI is unchanged.
So OI is a measure of commitment. Volume tells you how much traded; open interest tells you how much is still on the table afterwards.
The four states: OI read together with price
OI on its own says little. Its power comes from comparing it with what price did over the same window:
| Price | OI | Reading | What to do with it |
|---|---|---|---|
| ↑ | ↑ | New longs are funding the rally | The healthiest trend. Pullbacks tend to get bought. |
| ↑ | ↓ | Shorts are covering | Fast but fragile. Often fades once the covering is done. |
| ↓ | ↑ | New shorts are pressing | Sellers are committing capital — a real downtrend, or squeeze fuel if price turns. |
| ↓ | ↓ | Longs are unwinding | Liquidation and profit-taking. Selling pressure ends when the unwinding does. |
The chart at the top of this page puts the last 48 hours of a coin into one of these four boxes using live Binance data.
How much of a change matters?
There is no universal threshold, because OI moves differently on Bitcoin than on a small altcoin. Two practical rules:
- Compare a coin with itself. A 5% OI jump in a day is huge for BTC and routine for a new listing. Comparing OI with its own value a few bars ago, or with its recent average, is more meaningful than a fixed number.
- Pair it with price size. OI up 15% while price moved 1% means size is being added quietly. OI up 15% while price rose 20% means the crowd is chasing.
Example (illustrative): a coin trades flat for three days. Price is up 1%, but OI is up 40%. Nobody is chasing price, yet positions are piling in — one side is building a large position. When price finally breaks out of the range, the side that is wrong has to close, and that adds fuel to the move.
Common mistakes
- Treating rising OI as bullish. Rising OI only means more positions. Whether that is bullish depends on what price is doing.
- Comparing different exchanges. Each exchange reports its own OI. Aggregated OI on charting sites adds several exchanges together and will never match one exchange’s figure.
- Ignoring funding. OI tells you how many positions exist; funding tells you which side is paying to keep them open. Use both.
- Reading one candle. A single-bar OI spike can be a single large trader. Look for OI that keeps rising over several bars.
Turning it into a scan
Reading OI coin by coin is slow. In CryptoScanX, OI is a scan condition, so you can ask the whole market at once:
New money behind the move
Price up 5%+ over two candles, OI up 10%+ in a day, volume three times normal.
Quiet build-up
Positioning jumps while price hasn’t moved yet.
OI Change % is free on every account. See the open interest scanner for more ready-made scans.
Frequently asked questions
Is rising open interest bullish?
Not by itself. Rising OI means more contracts are open. With rising price it usually signals new longs funding the move; with falling price it signals new shorts pressing.
What is the difference between volume and open interest?
Volume counts every contract traded in a period. Open interest counts the contracts still open at the end of it. High volume with flat OI means positions changed hands; rising OI means new positions were opened.
Why does OI differ between websites?
Each exchange reports its own open interest. Aggregated figures add several exchanges together, so they will be larger than any single exchange’s number.
Crypto futures are leveraged and carry a high risk of loss. This guide is educational and is not investment advice.