# Epoch and Ratio

BitFi uses epochs as price update intervals.

At the end of each epoch, BitFi updates the exchange rates for bfBTC - BTC and pbfUSD or hbfUSD - bfUSD.

* [Epoch Updates](/bitfi/developer/epoch-and-ratio/epoch-updates.md)
* [bfUSD Epoch Vesting](/bitfi/developer/epoch-and-ratio/bfusd-epoch-vesting.md)
* [Underlying Asset Price Variation](/bitfi/developer/epoch-and-ratio/underlying-asset-price-variation.md)


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