Open interest (OI) is the number of derivative contracts that remain open at a point in time. It is not the number of trades during a period and is not automatically a measure of money entering the market or of whether traders are net bullish or bearish.
How open interest changes
Every open futures contract has a long side and a short side, but exchanges count the contract once. When a new buyer and seller open a contract, OI rises by one. When an existing position is transferred to another participant, OI can stay the same. When a contract is closed or settled, OI falls. A liquidation can reduce OI if it closes contracts, while other contracts may open at the same time.
Open interest and trading volume
Volume counts contracts traded over a chosen period; OI counts contracts still open at the measurement point. High volume can occur while OI rises, falls or stays nearly unchanged, depending on whether trades open positions or close existing ones. Identify the market, contract type, unit, timestamp and whether a chart reports contracts, underlying units or notional value.
Interpreting OI with price
Price and OI are context, not a directional verdict. A rising price with rising OI means more contracts are open while prices rose, but each contract still has both a long and a short. It does not prove that “new money entered long.” Falling OI can reflect closures by either side. Funding rates, basis, liquidations, spot flows, venue coverage and contract design can add context, but OI alone is not a reliable prediction.
Aggregated data and limitations
Crypto dashboards may combine data from multiple exchanges and display it as contract counts or estimated dollar value. Contract sizes, currencies, reporting intervals and coverage can differ. A combined chart is only interpretable when its methodology and unit are clear; OI displayed as notional value can also change when prices move.
Social Media Sentiment
A September 17, 2026 r/CryptoMarkets discussion asked why Bitcoin open interest rose during a reported wave of long liquidations. Participants used the example to distinguish forced position closures from the total stock of contracts still open. This is a small, single-thread snapshot, not a broad survey or proof of a market-wide interpretation.
Last updated: 2026-10
Related Terms
See Also
- How the 2024 Bitcoin ETF Changed Crypto — discusses market access and institutional trading context.
- Why Does Bitcoin Still Move With the Stock Market? — examines how analysts interpret market relationships.
- Bitcoin as Collateral: Bank Loans, Mortgages, and DeFi Explained — covers collateral-backed exposure alongside derivatives.
- Swap crypto with ChangeNOW
Sources
- CME Group: Open Interest — defines outstanding futures contracts and distinguishes OI from period trading volume.
- CME Group: Volume and Open Interest Columns — explains how one side of each open contract is counted in exchange reporting.
- Binance Options Market Data API — shows that an exchange reports open-interest values with specific contract units and fields.