The sender pays € 0.0005 per item transaction.
Fully according to the "pay-per-use" model. No shipments means no costs.
Example cost breakdown
If you send 8 pallets that each contain 40 crates to the next supply chain partner, the price will be:
8 pallets + 320 crates = €0.164 for that transaction
And only €0.21 for an FTL with empty pallets