USPS Simple Shipping for Woocommerce

USPS Simple integrates the US postal domestic service as a new shipping method in WooCommerce. The plugin retrieves real-time rates through the USPS API.

By default, the plugin individually calculates the shipping price for each item in the cart, simulating separate shipments. The total price displayed to the customer is the sum of the individual item prices.

For regular-sized items, there is an option to group them based on their weight. If this feature is enabled, the dimensions of the grouped items are disregarded in the calculation.

To ensure compatibility, please set the WooCommerce currency to the US dollar and ensure that the base country is the USA.

USPS Simple supports the following services:

• First-Class Mail
• USPS Ground Advantage
• USPS Retail Ground
• Media Mail Parcel
• Library Mail Parcel

USPS WebTools API retirement — 25 January 2026

USPS Simple calculates online shipping rates using the USPS WebTools API, which will be shut down on 25 January 2026. For more information, please refer to the official announcement on usps.com.

Starting on the date, USPS Simple will stop providing Priority Mail Express, Priority Mail, and Retail Ground options to your customers.

First-Class Mail, Ground Advantage, Media Mail, and Library Mail will switch to retail rates, but will otherwise continue working as usual.

No actions required if you don't use commercial rates, Priority Mail, or Retail Ground. Otherwise, please consider replacing them with custom shipping rules (see Weight Based Shipping or Tree Table Rate Shipping), using a custom code snippet, or switching to a different plugin that provides live USPS rates.