The importer of record is responsible for paying duty. The seller of the goods cannot pay duty in advance. Be leery of sellers who claim duty on your purchase will be prepaid. Cleared and Delivered may pay duty on your behalf as part of their services in clearing your goods when they arrive in the United States.

Reciprocal Tariffs-Trump Executive Order-April 2nd
By the authority vested in me as President by the Constitution and the laws of the United States of America, including the International Emergency Economic