> For the complete documentation index, see [llms.txt](https://bitfi-2.gitbook.io/bitfi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bitfi-2.gitbook.io/bitfi/developer/epoch-and-ratio.md).

# 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)