Description

The USPS Shipping addon connects WooCommerce checkout to the United States Postal Service API, calculating real-time shipping rates for services such as Priority Mail, First-Class Mail, Priority Mail Express, and Parcel Select. Designed for stores selling physical products shipped from the United States, it displays exact rates based on weight, dimensions, and destination ZIP code directly on the checkout page.

Key Features of USPS Shipping

  • Real-time calculation via API
    Queries the official USPS API and returns current rates during checkout.
  • Domestic services covered
    Supports Priority Mail, First-Class Mail, Priority Mail Express, Parcel Select, and Media Mail.
  • International shipping
    Enables options such as Priority Mail International, First-Class Package International, and Priority Mail Express International.
  • Calculation based on weight and dimensions
    Uses the weight and dimensions configured for each product to return the correct postage rate.
  • Compatibility with Flat Rate Boxes
    Allows products to be mapped to standardized USPS boxes and charges the corresponding flat rate.

Benefits of USPS Shipping

  • Accurate shipping at checkout
    Eliminates discrepancies between the amount charged to the customer and the actual postage cost.
  • Less cart abandonment
    Displays the final shipping price before payment, reducing surprises that prevent purchases.
  • No manual shipping rate table
    Eliminates the need to manually create and update regions and weight ranges.
  • Domestic and international coverage
    Supports sales within the U.S. and exports through the same centralized configuration.

Who Is USPS Shipping For?

  • Anyone selling physical products shipped from the United States through WooCommerce.
  • You, if you use USPS as your primary carrier or as an alternative to UPS and FedEx.
  • Anyone who needs to offer international shipping with rates calculated directly through the USPS API.

How to Download USPS Shipping

USPS Shipping is available for download here at Ultrapack. After downloading the .zip file, install it by going to Plugins > Add New > Upload Plugin, select the file, and activate it. Credentials and shipping services can be configured under WooCommerce > Settings > Shipping, in the dedicated USPS tab.

Designed for WooCommerce stores that handle logistics in the United States, USPS Shipping centralizes shipping rate calculations within the store dashboard and eliminates external rate spreadsheets. Direct integration with the API keeps rates aligned with the official U.S. postal service pricing at all times, ensuring consistency between what the customer sees and the actual postage cost when the order is shipped.

Frequently asked questions

Is WooCommerce USPS Shipping GPL-licensed?

Yes. WooCommerce USPS Shipping is distributed under the GPL (GNU General Public License). You may legally use, modify and redistribute it on as many sites as you want.

Can I use WooCommerce USPS Shipping on multiple sites?

Yes. You can install WooCommerce USPS Shipping on as many sites as you want. Only automatic updates through Ultrapack Auto Updater have a limit: from 3 to 80 sites, depending on the plan.

How much does WooCommerce USPS Shipping cost at Ultrapack?

WooCommerce USPS Shipping costs US$2.99 as a single purchase, and it is also included in the subscription plans starting at US$12/mo (VIP I).

Does WooCommerce USPS Shipping include updates?

Yes. The current version of WooCommerce USPS Shipping is 5.6.6, published at Ultrapack on Sep 24, 2026. Subscribers update straight from the WordPress dashboard with UAU (Ultrapack Auto Updater).

Is WooCommerce USPS Shipping scanned before publication?

Yes. Every version of WooCommerce USPS Shipping goes through a malware scan (ClamAV and YARA rules, at UltraHub) before it is published.

What are the requirements for the plugin WooCommerce USPS Shipping?

Requires WordPress 7.0 or higher and PHP 7.4 or higher. Tested up to WordPress 7.1.