Stamps.com

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:

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 Services

USPS offers economical, efficient options to ship your packages across the country or globe. The tables below describe the varying services, their criteria, restrictions, and insurance coverage. 

Domestic Services

Description

USPS First Class Mail

USPS’s most economically-priced shipping service for parcels under 16 oz. Delivered generally in 1-5 business days. Tracking offered only for packages and thick envelopes with delivery confirmation.

USPS Priority Mail

USPS’s quicker service to ship trackable packages up to 70 lbs in 1-3 days.

USPS Priority Mail Express

USPS’s expedited service to deliver shipments weighing up to 70 lbs in 1 or 2 days, including Sundays and holidays. Insures packages up to $200.

USPS Media Mail

USPS’s economical option for shipping books (at least 8 pages), DVDs, videocassettes, CDs, printed music, vinyl records and other sound recordings that are under 70 lbs. Delivery is between 2-9 days. 

(NOTE: Video games, computer drives, or digital drives of any kind do not qualify for mailing at Media Mail prices.)

USPS Parcel Select Ground

USPS’s service for ground delivery on large packages up to 70 lbs. The rates are lower due to an estimated delivery time frame of 2-8 days.

 

International Services

Description

USPS First Class Mail International

USPS’s most economical way to send shipments up to 4 lbs. Delivery time can take 7-21 days.

USPS Priority Mail International

USPS’s quicker option for shipments weighing up to 70 lbs in 6-10 days.

USPS Priority Mail Express International

USPS’s expedited shipping service to deliver shipments weighing up to 70 lbs in 3-5 business days.


Service and Dimension and Weight Limits

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

Domestic Services

Dimensions and Weight Limit

USPS First Class Mail

Large Flat Envelope: 

Minimum: 6 1/8” x 11 1/2"

Maximum: 12” x 15” 

Weight: 13 oz. max

Package/Thick Envelope:

Maximum: Girth* cannot exceed 108”

Weight: 15.99 oz

*Girth = the measurement around the thickest part of the package.

USPS Priority Mail

Flat Rate/Padded Flat Rate Envelope

Dimensions: 12-1/2" x 9-1/2"

Max Weight: 70 lbs.

USPS Priority Mail Express

Package/Thick Envelope: 

Max Dimensions: Girth cannot exceed 108”

Max Weight: 70 lbs.

USPS Media Mail

Package/Thick Envelope: 

Maximum: Girth cannot exceed 108”

Weight: 70 lbs.

USPS Parcel Select

Package/Thick Envelope: 

Maximum: Girth cannot exceed 108”

Max Weight: 70 lbs.

 

International Services

Dimensions and Weight Limit

USPS First Class Mail International

Package/Thick Envelope:

Max Dimensions: 24” Length, L+H+W=36”

Max Weight: 4 lbs

USPS Priority Mail International

Flat Rate/Flat Rate Padded Envelope:

Dimensions: 12 1/2 “ x 9 1/2”

Max Weight: 4 lbs

 

Package/Thick Envelope:

Max Dimensions: Length + Girth 108”

Max Weight: 4-70 lbs (Depending on destination country)

USPS Priority Mail Express International

Package/Thick Envelope:

Max Dimensions: Length + Girth: 79”

Max Weight: 22-70 lbs (depending on destination country)

Flat Rate/Flat Rate Padded Envelope:

Dimensions: 12 1/2 “ x 9 1/2”

Max Weight: 4 lbs.


Included Insurance Coverage

This table explains the amount of insurance (Covered Value) that Stamps.com provides for each service listed below. Because you must insure the full value of an item, should that item’s value be greater than what’s listed below, use a third-party shipping insurance like ShipSurance to insure the total amount of the shipment.   

Service

Covered Value

USPS Priority Mail

Up to $100

USPS Priority Mail Express

Up to $100

USPS Priority Mail (International)

Up to $200

USPS Priority Mail Express (International)

Up to $200


NOTE: First Class Mail, Media Mail, and Parcel Select
DO include insurance with the price of the label. USPS Priority Mail DOES NOT include insurance with the price of the label. 

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.

Max weight

15.99 oz

Max dimensions

(L) 22" x (H) 18" x (W) 15"

 

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.

Max weight

70 lbs

Max dimensions

Length + Girth < 108"

 

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.