Resolved after 1 day 4 hours, on September 21, 2026.
Stamps.com Engineers have fixed the cubic rating issue and all systems are functioning normally. Thank you for your patience.
Update timeline
- investigating Sep 21, 2026, 08:27 PM UTC
Stamps.com Engineers have identified an issue that may temporarily affect some of our customers' ability to receive cubic rates for qualifying USPS shipments. We are working to quickly resolve this issue and will provide an update when it is available. We apologize for the inconvenience.
- resolved Sep 23, 2026, 12:46 AM UTC
Stamps.com Engineers have fixed the cubic rating issue and all systems are functioning normally. Thank you for your patience.
Your product runs on more than Stamps.com
Add the vendors you depend on and get one message when any of them reports trouble. Free for 3 vendors, no card.
Amazon Web Services