A.) No, unless you are trying to swap to or from BDX directly. BDX is only used when Minting/Redeeming in order to make up for the collateral ratio and keep the tokens stable.
Q.) What are the fees for swapping?
A.) There is a small fee which is typically 0.3%. The fee will be automatically calculated once you choose the tokens you would like to swap. 0.25% will be rewarded to the liquidity provider while the remaining 0.05% goes to the protocol’s treasury.