Frax is a fractional-algorithmic stablecoin, it is the first cryptocurrency to be partially backed by asset collateral and partially stabilized by cryptographic algorithms. Algorithmic stablecoins reach a stable value and balance their circulating supply by being based on a different reserve asset.
The Frax protocol makes use of two different assets. These are the Frax (FRAX) stablecoin, which is pegged 1:1 to the US dollar, and the Frax Shares (FXS) token, which is used as a governance and utility token.