Glossary/Open interest
Open interest
Open interest (OI) is the number of open derivative contracts (or notional) that have not been closed or settled. Rising OI with rising price can indicate new capital entering; interpretation always depends on context and venue definitions.
How AymarData records it
OI is a natural companion series to Hyperliquid and Binance perp books. Join OI timestamps carefully with L2 mids from AymarData. Check schema/changelog for field availability on your plan; L2 and trades remain the core recorded streams.