Sometimes. It depends on how shipping will be paid on a given order.

Some orders/sellers require a UPS/FedEx/DHL/etc. account. In that case, you will be prompted to enter your shipping account number* during checkout. The seller (or their broker) will then bill shipping charges to your shipping account.

*If you don't already have a shipping account, you can open one in minutes (be sure to do so in a separate window). You have 30 minutes to complete each transaction by entering valid shipping account and payment details.