xUSD is an appreciating stable coin that is liquidity backed over 100 percent by BUSD. It's internal market maker ensures that every transaction (buys, sells & transfers) raise the value of xUSD relative to BUSD. The pricing algorithm shifts the supply ratio between the underlying asset and the total supply of xUSD, thereby allowing for every transaction to raise the value of the token.
Price is calculated as a ratio between Total Supply and underlying asset quantity in Contract. By design, xUSD's total supply is a variable that can never be less than 1 and is determined by buy versus sell pressure. There is no maximum total supply.