The Frax Share token (FXS) is the non-stable, utility token in the protocol. It is meant to be volatile and hold rights to governance and all utility of the system. It is important to note that we take a highly governance-minimized approach to designing trustless money in the same ethos as Bitcoin. We eschew DAO-like active management such as MakerDAO. The less parameters for a community to be able to actively manage, the less there is to disagree on. Parameters that are up for governance through FXS include adding/adjusting collateral pools, adjusting various fees (like minting or redeeming), and refreshing the rate of the collateral ratio. No other actions such as active management of collateral or addition of human-modifiable parameters are possible other than a hardfork that would require voluntarily moving to a new implementation entirely.
The FXS token has the potential of upside utility and downside utility of the system, where the delta changes in value are always stabilized away from the FRAX token itself. FXS supply is initially set to 100 million tokens at genesis, but the amount in circulation will likely be deflationary as FRAX is minted at higher algorithmic ratios. The design of the protocol is such that FXS would be largely deflationary in supply as long as FRAX demand grows.