AIMS360 gets USPS rates and prints USPS labels through EasyPost, on your own EasyPost account, from the same screens as UPS and FedEx. Brands on Endicia software can connect that instead. Tracking and postage land back on the order and invoice.
Light DTC parcels often go cheapest by USPS. In AIMS360, USPS rates and labels come through EasyPost on your own account, so a USPS service sits on the same rate list as UPS and FedEx and the label prints from the same pick ticket. Brands that already run Endicia software can connect it instead.
Yes. AIMS360 reaches USPS through EasyPost. You connect your EasyPost account with its API key, choose your negotiated rate or the standard published rate, and USPS services show up next to UPS and FedEx when you rate a packed shipment. The rate EasyPost returns is based on the to and from addresses, the carton dimensions and the weight. Labels print from Finalize Pick Ticket or Shipment Processing.
Brands that print postage with Endicia software can link it through the AIMS360 shipping integration instead. For a new setup, EasyPost is the simpler route, and it also covers Canada Post and Purolator if you ship to Canada.
Each one puts the tracking and the postage back on the AIMS360 order. They differ in which postage account prints the label.
| Route | How it works | Best for |
|---|---|---|
| EasyPost API | Your EasyPost API key in AIMS360 system settings. USPS rates and labels come straight back into AIMS360. | Most brands, and any new USPS setup |
| Endicia software | Endicia and AIMS360 share files through the shipping integration or the Advanced Shipping Utility | Brands already printing postage in Endicia. Check its status first, see the Endicia page |
| ShipStation | Pick tickets go to ShipStation, you label there, and tracking and freight come back | Teams that pack in ShipStation. See ShipStation |
About as long as it takes to find the API key.
USPS rates and labels run on your own EasyPost account. Copy its API key from your EasyPost account settings.
Under Setup, System Settings, open the EasyPost tab, enable the integration and paste the API key.
Choose your negotiated rate or the standard published rate, and the fields you want printed on the label, then save.
Shipment Processing needs the unit of measure settings filled in. Empty settings cause errors when AIMS360 asks for USPS rates.
Each USPS service you use needs its ShipVia code mapped, so orders, rating and labels point at the same service.
Rate and label one real parcel, then check the tracking number and postage on the pick ticket and invoice.
Small settings, but each one stops a label.
A label voided in AIMS360 stays on record in EasyPost. If you void and reprint, AIMS360 shows the labels in use while EasyPost may list more for the same shipment.
PDF and PNG labels print straight from AIMS360. EPL and ZPL labels for thermal printers print through the AIMS360 label printing utility.
Shipping templates on a customer work with USPS too, for ship-from and return addresses and references, when the order is flagged third party.
USPS retired its legacy Web Tools APIs on January 25, 2026. Rating through EasyPost does not depend on a Web Tools login.
Yes. AIMS360 gets USPS rates and prints USPS labels through EasyPost on your own account, or through Endicia software if you already use it.
For the API route, yes. AIMS360 connects with the API key from your own EasyPost account, and postage runs on that account.
The EasyPost setup lets you choose your negotiated rate or the standard published rate. Which negotiated rates you have depends on your EasyPost and USPS arrangements.
Yes. When you rate a packed shipment, USPS services from EasyPost show next to UPS and FedEx on the same list, with price and service for each.
USPS retired its legacy Web Tools APIs on January 25, 2026. In AIMS360, USPS rates and labels come through EasyPost, which does not need a Web Tools login.
Yes. Turn on Canada Post or Purolator in your EasyPost account, and AIMS360 support adds the ShipVia codes for those services.
Usually the unit of measure settings are empty, or the USPS ShipVia code is not mapped to a service. Fill both and rate again.
Bring a real order. We will rate it across USPS, UPS and FedEx, print the label and show where the postage and tracking land.
