This information comes directly from Nexo's help center
Buy and Sell are two types of actions that represent the interaction between the Base and the Quote assets. The action is initiated against the Base asset. When a Buy is opened, we are spending the Quote asset to acquire (buy) the Base asset. Performing a Sell, on the other hand, means spending (selling) the Base asset to obtain the Quote asset.
For example, if the BTC/USDT pair is selected, BTC is the Base asset and USDT is the Quote asset. A Buy means acquiring BTC by selling USDT. On the other hand, a Sell means spending BTC to obtain USDT.
Source: What is a Buy & Sell?
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