The Pick-up Charge is a one time charge for each container that is picked up that is negotiated for each deal. This charge can be paid by both the supplier or the user, depending on the market situation. For example; in locations where the supplier has a shortage of containers, the cost will typically be by the user while if the user picks up boxes from a location with a large surplus and moves it to a deficit location, then the supplier often pays the charge.
Note that this charge is not designed to cover a specific cost, but rather a general charge that would apply to the deal. The standard pick-up charge on xChange is $0.