For educational purposes only; not investment advice. Investing may result in loss.
Direct answer
Open interest measures the size of contracts that have not yet been closed. This entry explains the relationship between OI and price, funding rates, and leverage congestion.
Open Interest (OI) is the total size of derivatives contracts that have not yet been closed, expired or settled. It describes how much contract exposure there is still in the market, and does not directly indicate which side is stronger: long or short. Each contract has two counterparties, long and short, so an increase in OI means new positions are opened in pairs, rather than “more longs than shorts.”
If A opens a new 1 BTC long order and B opens a new 1 BTC short order, and a new contract is added to the market, OI will increase by 1 BTC instead of 2 BTC. When A transfers the long order to C and B continues to hold the short order, the contract still exists and OI remains unchanged. OI decreases when trades offset open positions, such as when a long and a short are both closed or when an expiring contract is settled or delivered; the original counterparties do not have to close at the same time.
The platform can display OI in currency-based quantity, number of contracts or nominal value in US dollars. When the quantity of BTC remains unchanged and the price rises from US$50,000 to US$60,000, the US dollar-based OI will naturally increase by 20%, which does not mean that 20% of new contracts have been added. Therefore, cross-time comparisons must confirm the pricing unit, and cross-exchange contract multipliers and statistical ranges must be confirmed.
OI is different from trading volume. Trading volume counts how many contracts changed hands over a period of time, and the transfer of positions between different traders can create many transactions; OI is the stock of contracts that remain open at a point in time. High trading volume with unchanged OI may mean a change of hands, while high trading volume with a sharp drop in OI may mean concentrated liquidation or other forced unwinding.
How it works
When both parties open positions, OI increases; when both parties close positions, OI decreases; when one party opens a position and the other party transfers the old position to the other party, OI can remain unchanged. Exchanges usually aggregate data from matching and positioning systems, and aggregation websites add up the different platforms. Multiple data sources may be inconsistent due to different update times, currency calibers, and whether options are included.
Perpetual contracts have no expiration date, and the funding rate is used to keep the contract price close to the spot. A positive funding rate usually means that longs are paying shorts, and a negative funding rate is the opposite, but the rate does not mean that the market will inevitably reverse. The combination of OI, price and funding rate can describe leverage congestion.
Liquidation can quickly reduce OI. Highly leveraged longs are forced to sell when prices fall, which may push more accounts to trigger liquidation, forming a chain feedback; short liquidation may form an upward squeeze. Liquidation data often only covers specific platforms, and “estimated liquidation maps” are not actual order commitments from the exchange.
Example
Assume that BTC rises from US$60,000 to US$63,000, and the BTC caliber OI increases from 300,000 BTC to 330,000 BTC, indicating that approximately 30,000 BTC new contract exposure is established. During the same period, the eight-hour funding rate rose from 0.01% to 0.08%, the perpetual premium expanded, and spot transactions only increased by 10%. This is more like a derivatives leverage push, and if prices fall back, crowded longs may accelerate unwinding.
In another scenario, the price also increased by 5%, but OI dropped from 300,000 BTC to 270,000 BTC, the funding rate returned from negative to close to zero, and spot transactions doubled. It may be short covering plus spot buying. The two gains are the same and the position structure is completely different, so OI cannot be used in isolation from other data.
Let’s look at the misleading US dollar caliber. If the OI is always 100,000 BTC and the price rises from 40,000 to 50,000 USD, the page shows that the USD OI rises from 4 billion to 5 billion USD. The actual number of contract coins did not increase, and the $1 billion change came entirely from the underlying revaluation. Analysts should also record coin-based OI.
Risks
When OI is concentrated on one platform, the platform’s margin adjustment, withdrawal restrictions or downtime will change the liquidation process. An exchange reduces the maximum leverage from twenty times to ten times, and users are forced to reduce their positions, which will cause OI to decline, even if the market view does not change. Differences in funding rates between platforms will also attract cross-platform arbitrage, making individual platform data out of touch with the direction of the market.
The research report should clearly state the data deadline, including the platform and conversion method. If the coin price changes significantly within the statistics window, it is best to display both the coin-based quantity and the dollar value. Although such records cannot predict prices, they can prevent pricing changes from being mistaken for actual openings.
Recording consistency is more important than pursuing single-time accuracy.
Common misconceptions
Myth 1: Rising OI means an increase in long positions
Each contract has both long and short sides at the same time. OI can only indicate an increase in unclosed exposure, and the direction needs to be judged based on price, rate and transaction.
Myth 2: A drop in OI must be a liquidation
Active liquidation, delivery at maturity, contract migration and price revaluation may all cause a drop in OI. Liquidation is just one reason.
Myth 3: The growth of US dollar OI is the inflow of funds
The rise in the underlying will enlarge the nominal value of the US dollar, even if the contract currency number remains unchanged. It is not an actual deposit of margin, nor is it new cash on the exchange.
Myth 4: Extremely high OI will inevitably reverse immediately
Congestion increases the risk of volatility, but does not provide precise timing. Trends can continue at high OI and counter-trend trades are equally likely to be liquidated.
Related topics
Sources
- Explanatory Notes: Commitments of Traders - CFTC (accessed: 2026-08-21)
- Volume and Open Interest Columns Explained - CME Group (accessed: 2026-08-21)
- Understand the Risks of Virtual Currency Trading - CFTC (accessed: 2026-08-21)