Glossary

Open interest

Open interest is the total notional value of outstanding positions in a market.

In short

Open interest counts contracts currently open rather than traded volume. Rising open interest with rising price suggests new positioning; falling open interest suggests positions being closed.

Why it matters for crowded trades

High open interest concentrated on one side of a market is a liquidation-cascade ingredient: a modest adverse move can force closures that push price further in the same direction.

For a mirrored account this shows up as slippage and, in extreme cases, as ADL — both worse than usual precisely when the market is most crowded.

Questions

Frequently asked

Is high open interest bad?

Not inherently. Concentrated one-sided positioning with high funding is the risky combination.

Where can I see it?

Hyperliquid publishes per-market open interest on-chain.

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