Atmos aUSD is a fractional-algorithmic stablecoin in the Atmos Protocol.
aUSD - an automated, fractional-algorithmic stablecoin with a floating/unbacked supply, meaning that the part of the supply is backed by the collateral and a part stays algorithmic. Atmos Protocol issues aUSD, which attempts to target a particular price index ($1 value), using a targeting mechanism that continuously works to push the price toward the index if it veers away in either direction.
Collateral Ratio (CR) and algorithmic depends on the market's pricing of the aUSD stablecoin. If aUSD is trading at above $1, the protocol decreases the Collateral Ratio. If aUSD is trading at under $1, the protocol increases the Collateral Ratio.
Atmos Protocol uses both tokens usefully, meaning that aUSD is fractional and requires ATM and USDC for the creation (minting). At the genesis, aUSD will be 100% collateralized, meaning that the fractional phase will be live once market supply and demand together with the aUSD price will change.
aUSD doesn't have a fixed supply, the circulation supply depends only on the current market supply and demand.