ShipEngine Carriers gives you one payment method that can buy labels from multiple carriers. Currently, ShipEngine Carriers includes USPS and UPS service providers.
ShipEngine Carriers works like a single postage account in ShipEngine for you to create labels. There’s no need to create individual carrier accounts. With ShipEngine Carriers, you set up the billing method you wish to use and purchase your labels.
In addition to managing multiple carriers from one postage account, ShipEngine Carriers gives you access to discounted rates from both USPS and UPS, including cubic pricing for USPS shipments! To learn more about these discounted rates, reach out to our sales team.
This article includes:
To start using ShipEngine Carriers, log in to the ShipEngine dashboard and follow these steps:
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Add your billing information in the pop-up window, then click the Continue button.
You will now see Stamps.com (USPS services) and UPS listed under ShipEngine Carrier Accounts. Each carrier will have a unique Carrier ID. You can also make a List Carriers call to view all of your Carrier IDs and available services.

Note
With ShipEngine Carriers, you will not have access to your own USPS or UPS account. You are still able to connect separate USPS or UPS accounts through the Connect My Own Carriers process.
After you have set up ShipEngine Carriers, you will need to add funds to begin making labels. All labels created using ShipEngine Carriers are prepaid and use a shared pool of funds.
To add funds to your ShipEngine Carriers balance:
Feature |
USPS from ShipEngine |
UPS from ShipEngine |
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Domestic Shipping |
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International Shipping |
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Electronic Customs Submission* |
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Return Labels |
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Estimated Rates |
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Carrier Insurance |
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Tracking |
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Automatic Tracking |
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End of Day (Electronic) |
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End of Day (PDF) |
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Label Branding |
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Label Messages |
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Multi-package Shipping |
Cubic pricing is available by default for all ShipEngine users creating labels with USPS from ShipEngine.
Cubic rates are ideal for small, heavy packages since the pricing is based on the volume of the package instead of the weight. Any package that measures 0.50 cubic feet or less and is 20 pounds or less is eligible.
To receive cubic rates in ShipEngine:
Choose a USPS domestic Priority service.
Choose a package type of Package.
Enter the package weight & dimensions.
ShipEngine will automatically apply the cubic rate whenever it's cheaper than the Priority rate.