USPS APIs System Release Notification November 12

Scheduled for Nov 13, 01:00 - 05:00 UTC

Update

We will be undergoing scheduled maintenance during this time.

Posted Nov 03, 2026 - 01:29 UTC

Scheduled

USPS will do planned maintenance on its APIs on Thursday, November 12, from 5:00 PM to 9:00 PM PT (8:00 PM to 12:00 AM ET).

During this window, you may see brief errors, a few minutes at most. USPS will update its systems one at a time, not all at once.

USPS says these APIs may be affected:

Domestic Labels
International Labels
OAuth (authentication)
Tracking (legacy 3.0 version only)

Package delivery is not affected. If a USPS label or tracking request fails in this window, retry it after a few minutes.

We will post an update when USPS completes the maintenance.

Posted Nov 03, 2026 - 01:29 UTC

This scheduled maintenance affects: Carrier APIs (Endicia USPS API, PitneyBowes API, USPS Direct API Status).