Shipping carriers like USPS, FedEx, and UPS offer flat-rate shipping boxes with set rates for delivering items contained within them. This is often cheaper than buying your boxes and getting a custom ...

Shipping with Flat Rate Boxes is a breeze. As long as it will fit in the box, it will ship at the same price whenever possible. The boxes are provided by USPS for free, and if your shipment is going ...

Shopify Shipping offers different carriers and mail classes to help you access great rates and fast fulfillment for your ...

The 2-pound flat-rate envelope is typically ... When it comes to shipping packages overnight, not everyone wants to use the USPS. Fortunately, there are a variety of ways to send overnight mail.

The last day to mail a package before Christmas will be here before you know it — here's your USPS, UPS and FedEx cheat sheet ...

This .NET class library handles all communications with the US Postal Service web API to obtain postage rates. Your application only needs to instantiate the USPSRateCalculator class included in this ...

Here's what frequent mailers need to know about USPS' 2025 rates. The cost of a first-class stamp is 73 cents; that includes ...

The USPS is ... the timely delivery of ballots is key leading up to the election, the 69.8% statistic applies to all first-class mail. Ballots have an inbound on-time delivery rate of 95.1% ...

Given some shipment details and rate options, this method returns a list of rate quotes. Please see our docs to learn more about calculating rates.