Open interest (OI) is the total value of all open positions in a market that have not yet been closed or settled. In crypto perpetual futures, it's one of the clearest real-time indicators of market participation and conviction.
A rising OI means capital is actively entering the market. A falling OI means positions are being closed — traders are exiting, whether by choice or through liquidation.
The Basics: What Open Interest Measures
Every open position has two sides: a long and a short. When a new long opens against a new short, open interest increases by the size of that position. When an existing long closes against an existing short, open interest decreases by the same amount.
OI doesn't count the number of traders — it counts the total value of active positions outstanding at any point in time.
The number you see reported on any venue is typically the notional value of all open positions, denominated in USD (or the quote currency). A venue showing $500M in open interest has $500M worth of leveraged positions that haven't been closed yet.
Why Open Interest Matters in Perp Markets
In perpetual futures specifically, open interest is a more informative metric than in traditional markets for two reasons.
First, there's no settlement forcing positions closed. In dated futures, open interest naturally compresses as expiry approaches — all contracts settle and OI drops to zero. In perps, OI can build indefinitely. A multi-month accumulation of long positions, still open, is visible in the data.
Second, OI directly affects funding rates. When longs dominate the open interest, the funding rate turns positive — longs pay shorts. The larger the OI imbalance, the higher the cost of holding the dominant side. This creates a direct feedback loop between positioning data and trading costs.
Reading OI alongside the funding rate tells you both how crowded the market is and how much that crowding is costing.
How to Interpret Open Interest Alongside Price
On its own, OI is directionally neutral — it doesn't tell you whether positions are net long or short, just how much total capital is deployed. The signal comes from pairing OI with price direction:
| Price | OI | What it suggests |
|---|---|---|
| Rising | Rising | New capital entering long-side; trend has conviction |
| Rising | Falling | Short covering driving price up; less new buying, weaker signal |
| Falling | Rising | New shorts entering; bearish trend with participation |
| Falling | Falling | Long liquidations or profit-taking; trend may be exhausting |
The strongest trending moves typically show price and OI rising together. When price moves but OI falls, it often means existing positions are closing rather than new participants entering — a sign to treat the move with more skepticism.
Open Interest and Liquidation Risk
High open interest in a one-sided market — say, a large buildup of leveraged longs — creates a specific risk: a cascade.
If price drops enough to trigger liquidations, those forced closes add selling pressure, pushing price lower, which triggers more liquidations. The larger the OI, the more fuel a cascade has. This is why sharp drawdowns in crowded long markets can be violent and fast — the OI data in the days before a move often shows the buildup.
Watching OI alongside liquidation data gives advance warning. A market with $2B in long OI and rising funding is a different risk environment than one with $500M in balanced long/short OI — even if spot price is identical.
Open Interest vs. Volume
Volume measures how much was traded in a given period. Open interest measures how much is still open at a point in time. They're related but distinct.
High volume with falling OI means lots of positions are being opened and closed quickly — active but not accumulating. High volume with rising OI means the market is accumulating a structural position. The latter tends to matter more for multi-day price direction.
How LeverUp Manages Open Interest
LeverUp uses a cubic open interest funding model that restructures how funding rates respond to OI imbalances. Under normal conditions — where the imbalance is moderate — the cubic formula produces significantly lower funding signals than a linear model would. The protocol's ability to respond to severe imbalances is preserved, but traders holding positions in a balanced or moderately skewed market pay less.
The result is that OI can grow without creating persistent funding headwinds for one side of the market, which matters for anyone holding positions over multiple funding periods.
Read the full breakdown of the cubic OI model →
Frequently Asked Questions
What does it mean when open interest is high? High open interest means a large amount of capital is deployed in open positions. It signals participation and conviction, but also concentrated risk — especially if the OI is heavily skewed to one side. High OI in a crowded long market means there are a lot of positions that will get liquidated if price drops sharply.
Is high open interest bullish or bearish? Neither by itself. Rising OI with rising price is typically a bullish signal (new longs entering). Rising OI with falling price is bearish (new shorts entering). The direction of both OI and price together is what matters.
What happens to open interest during a liquidation cascade? OI drops sharply. Liquidated positions are forcibly closed, which removes them from the open interest total. A large spike in OI followed by a sudden drop often corresponds to a mass liquidation event.
How is open interest different from trading volume? Volume is the total of all trades executed in a period (buys + sells). Open interest is the stock of active positions that remain open at a given moment. Volume resets each day; open interest accumulates until positions close.
Why do perp markets have higher open interest than spot markets? Because leverage allows traders to control large positions with small collateral, and because there's no expiry forcing settlement. A single trader with $10,000 of collateral can hold a $1,000,000 position at 100x leverage — contributing $1M to the open interest figure. Spot markets don't have this amplification effect.
Where to Go From Here
Open interest is most useful read alongside funding rates and liquidation data. If you're new to perpetual futures mechanics, start with the core concepts: What Are Perpetual Futures? →
For a deeper look at how liquidations interact with OI in fast-moving markets: How Liquidations Work on LeverUp →
Trade perpetuals on LeverUp: app.leverup.xyz