88mph represents deposits and bonds using ERC-721 standard non-fungible tokens. This means that users can transfer them between accounts, buy or sell them on exchanges, put wrappers around them to add more features, and more.

At the moment, 88mph uses a linear model for determining the fixed interest rate offered to depositors. 88mph keeps track of the Exponential Moving Average (EMA) of the underlying yield protocol's APY over roughly a monthly window, and offers 75% of the EMA as the fixed rate.