You cannot use ShapeShift to turn your digital assets into USD or any other fiat. This is part of our strict no-fiat policy.
If you are a U.S. resident using ShapeShift.com, however, you can buy crypto using our integrated version of Wyre. If you are on ShapeShift.com and click "Buy Crypto", you will be asked to use your ACH bank account. Every crypto purchase with fiat is made via Wyre.