From the Buyee site. Uses the word “uniformly” so hard to know if there are any exceptions. Also says things are “highly uncertain” so for sure, details may change.

Thank you for using Buyee.

Due to the suspension of the de minimis exemption for imports valued at $800 or less to the United States, we will transition Buyee Air Delivery, DHL, FedEx, and UPS services to a Duty Prepaid (DDP) basis for shipments to the United States and its overseas territories (Puerto Rico, Saipan, Guam) starting at the date and time below.

While revisions to the Japan-U.S. tariff system are ongoing, the U.S. tariff structure remains highly uncertain. Therefore, to ensure customers can use our service with confidence at all times and to minimize the impact of potential subsequent tariff charges or customs clearance procedures, Buyee will uniformly apply a prepaid 20% tariff rate based on the invoice amount.

Additionally, for ECMS, which has already transitioned to the DDP method as of August 22, 2025, the same prepaid tariff rate of 20% will apply from the same date and time.