ZEC Open Interest Statistics:
ZEC Aggregated Open Interest Chart:
Aggregated open interest = open interest of coin-margined contracts + open interest of stablecoin-margined contracts converted to USD (notional value). For the moment only ZEC/USD and ZEC/USDT contracts are included. See the indicator settings, you can select/deselect individual contracts.
There are two other indicators that display raw open interest: aggregate open interest coin-margined contracts (value unit = USD) and aggregated open interest stablecoin-margined contracts (value unit = ZEC). See the chart indicators window.