Minting OUSD is completely free aside from the gas cost necessary for any Ethereum transaction. Depending on the current value of your collateral according to Chainlink’s price oracles, you may receive slightly less than one OUSD for each dollar of collateral deposited.
When OUSD is redeemed or burned on the OUSD dapp, a fee of 0.25% is charged as a security measure to protect the protocol from being used as a free DEX when stablecoin prices fluctuate. However, this fee can usually be avoided by simply selling OUSD on an exchange or AMM.
Selling OUSD instead of redeeming it also enables you to choose which token or currency you end up with. If you redeem OUSD for underlying collateral, you will receive a proportional mix of stablecoins according to the current balances of the Origin vault. There are no fees, other than gas, required to transfer OUSD.