Open interest (OI) is the total number of unsettled derivative contracts in a market at any given moment. In crypto, it most commonly refers to perpetual futures and is expressed in dollar terms. OI rises when new contracts are created (a new buyer and seller open a position) and falls when contracts are closed or liquidated.
How Open Interest Works
Each futures contract requires two parties: a long and a short. When both are new to the market, OI increases by one contract. When one closes, OI decreases.
OI increases when:
- A new long opens against a new short
- Both parties are entering fresh positions
OI decreases when:
- A long closes (sells) to an existing short closing
- A position is liquidated
OI stays the same when:
- An existing long sells to a new long (position transfer)
Open Interest vs. Volume
| Metric | Measures | Resets |
|---|---|---|
| Volume | Contracts traded in a period | Daily |
| Open Interest | Total open positions right now | Never resets; tracks running total |
Volume can be high with stable OI (traders opening and closing quickly). Rising OI at rising prices is often seen as a stronger trend signal than rising volume alone.
Interpreting Open Interest
| OI Trend | Price Trend | Interpretation |
|---|---|---|
| Rising | Rising | New money entering long — bullish confirmation |
| Rising | Falling | New money entering short — bearish confirmation |
| Falling | Rising | Short covering, not new buying — weaker signal |
| Falling | Falling | Long liquidations — potential capitulation |
OI peaks often coincide with local price tops, when leverage accumulation reaches unsustainable levels. The spike before a major crash is a classic pattern — OI reaches all-time highs just before mass liquidations.
Aggregated Open Interest
Traders track OI across all exchanges using tools like Coinglass, which aggregates Bitcoin and Ethereum OI across Binance, Bybit, OKX, CME, Deribit, and others. CME Bitcoin OI is particularly watched by institutional traders as a proxy for institutional positioning.
Bitcoin OI records:
- Pre-May 2021 crash: ~$26B aggregate OI
- Pre-November 2021 peak: ~$22B aggregate OI
- Post-FTX collapse low: ~$6B
- 2024 post-ETF peak: exceeded $30B+
History
- 2016 — BitMEX makes perpetual OI a visible metric; traders begin using it as a positioning indicator.
- May 2021 — Record OI before Bitcoin’s 50% crash; liquidation cascade of $10B+ in 24 hours.
- 2022 — Post-FTX collapse sees OI dry up to cyclical lows as leveraged speculation exits the market.
- 2024 — Bitcoin spot ETF approval brings CME OI into analyst focus as institutional gauge.
Social Media Sentiment
Open interest is a daily CT topic — funding rate tweets, OI chart shares, and ‘the market is overleveraged’ takes are core to derivatives trading discourse. Coinglass OI dashboards are widely embedded in CT analyses. Significant OI spikes consistently attract both ‘long squeeze incoming’ bearish takes and bulls arguing trend strength is confirmed.
Last updated: 2026-04
Related Terms
Sources
- Glassnode. (2023). Derivatives Market Weekly Reports. Glassnode Insights.
- CME Group. (2024). Bitcoin Futures Market Data and Open Interest Reports. CME Group.