Open Interest Explained: What OI Tells You in Crypto Perps
Updated · 2 min read
Open interest (OI) is the total value of perpetual or futures positions that are still open. Every open contract has a long and a short, so OI counts one side. Rising OI means new positions are being opened; falling OI means positions are being closed or liquidated. OI tells you how much leverage is in a market, not which direction it's leaning. For that, pair it with funding and price.
- OI = open positions, not volume. A trade that closes a position lowers OI.
- Price up + OI up = new longs (or shorts adding). Price up + OI down = shorts closing (short covering).
- High OI plus extreme funding = crowded, fragile market prone to liquidation cascades.
- OI is reported per venue. Aggregators add venues together.
Reading OI with price
| Price | Open interest | Usual reading |
|---|---|---|
| Rising | Rising | New money entering; trend backed by fresh positions |
| Rising | Falling | Shorts covering; move may fade once covering ends |
| Falling | Rising | New shorts entering (or longs averaging down) |
| Falling | Falling | Longs closing or being liquidated; flush-out |
These are tendencies, not rules. Add funding rates to see which side is paying. Rising OI with sharply positive funding points to crowded longs.
OI, liquidations and heatmaps
Liquidation heatmaps estimate where leveraged positions would be force-closed, based on OI and typical leverage. They're estimates. Exchanges don't publish individual liquidation prices, and cross-margin positions have liquidation prices that shift with the rest of the account.
Frequently asked questions
Is open interest the same as volume?
No. Volume counts every trade in a period. Open interest counts positions still open at a moment in time.
Does high open interest mean price will go up?
No. High OI means a lot of leverage is open on both sides. It raises the chance of a sharp move, in either direction, when positions are forced out.
Sources
Educational content, not financial advice. Perps and prop evaluations are high-risk; firm rules change, so check each firm's current terms.