Stamps.com is a USPS postage reseller that grants access to all standard services offered by USPS, as well as additional international shipping options through GlobalPost.

This article includes:

• How to connect an existing Stamps.com account
• How to setup auto-funding
• How to reauthorize your Stamps.com password
• Available Features
• Creating USPS labels for tubes and rolls

Connect a Stamps.com account to ShipEngine

1. Select the Connections button in the left-hand navigation bar of your ShipEngine account.
   
   
2. Select Add a Carrier.
   
   
3. Select the United States Postal Service by Stamps.com tile.
   
   
4. Choose the radio button that says, “I already have a Stamps.com account”.
   
   
5. Enter your stamps.com username and password and then click Next.

You’re now ready to start creating USPS labels with your Stamps.com account!

Set Up Auto-Funding

Configure ShipEngine to automatically purchase postage when your Stamps.com account balance dips below a certain amount.

1. Click the Connections tab in the left-hand side navigation bar.
   
   
2. Click Add Funds for your Stamps.com account listed under the Other Shipping Providers section.
   
   
3. Select the Set up Auto-Funding radio button, and set the minimum balance before more postage is automatically purchased. For example, if you wanted to purchase $100 any time your account balance is below $250, set the When balance drops below amount to ‘250’ and the Automatically fund by this amount to ‘100’. Then enter the maximum number of times ShipEngine should automatically purchase postage in a day next to Stop after this many times per day.
   
   
4. Click Submit 

Reset a Stamps.com Account Password

When you update your Stamps.com account password with Stamps.com, you will need to update the password in ShipEngine as well. Otherwise, you will encounter an error when attempting to use USPS services.

1. Click Edit beside the Stamps.com account that needs an updated password listed under the Other Shipping Carriers on the Connections page. 
   
2. Click Reauthorize in the new window that opens. 
   
   
3. Enter your updated Stamps.com password, then click Confirm. 
   
   

Now you’ll be able to start shipping with Stamps.com again!

Available Features

Common ShipEngine Features:

Shipping Options:

Additional Features:

NOTE: To meet USPS requirements ShipEngine will always display postage for First Class Mail with the Large Envelope/Flat package type.

Create USPS Labels for Tubes or Rolls

This section explains how to ship tubes via USPS First Class and Priority services. For each service, the same weight and size restrictions that apply to packages also apply to tubes.

While ‘Tube’ is not currently an available package type in ShipEngine, Stamps.com recommends using ‘Package’ as the package type for these shipments. Enter the tube’s correct dimensions to ensure that label charges reflect the proper rate, whether you are using your own custom packaging or the USPS provided Dual-Use Priority and Priority Mail Express tubes.  

TIP: Reference the USPS 201e Quick Service Guide to help determine the girth of a package.

USPS First Class Mail

For tubes, the height and width will be the same. USPS determines the rate by the weight of the package.

USPS Priority Mail

Priority Mail is zone-based pricing. That means for certain zip codes you will have to enter the dimensions of your tube in order to obtain the correct rate. Entering dimensions is always recommended to ensure your packages receive the correct rate from the postage provider. Incorrect dimensions can result in packages being returned, or rate adjustments applied to your postage provider account after shipping.

USPS Dual-Use Tubes

If you ship using the small or medium Priority Mail or Express tubes provided by the USPS, you will still select ‘Package’ for the package type and enter the dimensions for the tubes into ShipEngine.