USPS APIs Terms and Conditions

ACKNOWLEDGEMENT AND ACCEPTANCE. Read this carefully before registering to use the USPS API services. By utilizing the APIs, you hereby ACCEPT ALL of the terms and conditions of this Agreement. 

INFORMATIONAL: USPS APIs System Deployment - January 10, 2026

Labeling List Changes Effective February 1, 2026

Effective February 1, 2026, the Postal Service™ will revise Labeling List(s) L002, L005, L012, L016, L051, L201, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the February 1, 2026, effective date through March 31, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22694.

DELIVERY - Wrightwood Post Office (92397) - Temporarily Closed

DELIVERY - Lytle Creek Post Office (92358) - Temporarily Closed

INFORMATIONAL - USPS APIs System Maintenance January 14, 2026

PTR2 Release Notes_DD_01_10_26

INFORMATIONAL - Postal Service Files Requests for New Rules on Market Dominant Rates

INFORMATIONAL - MGI Important Dates

INFORMATIONAL - January Price Change 2026 - Commercial System Releases January 4

Mail Tracking Vendor List

This document provides contact information for a number of third-party service providers who offer mail owner and mail service provider solutions.

DELIVERY - Winter Weather Update December 18

Addressing Fact Sheet for First-Class Flats

This document is for mailers who are sending flat-size mail (such as large envelopes) at Automation and Presorted First-Class Mail prices. To use these prices, you must mail at least 500 pieces at a time, prepared and sorted according to Postal Service guidelines. 

Financial Audit Reporting Tool v4

PCC Event Planning Template 5.0 - 12.15.25

INFORMATIONAL - USPS Ship Payment Transaction Type Update for Monthly Assessments

INFORMATIONAL - Reminder - Christmas and New Year's Holiday Recommendations on Live Animal Shipping

DELIVERY - UPDATE - WestPac Area - Washington District - Hamilton Post Office (98255) - Temporarily Closed

DELIVERY - Hamilton Post Office (98255) - Temporarily Closed

INFORMATIONAL - U.S. Postal Service Announces Bid Solicitation

Opportunity to Feature NPF on Your Podcast

Request to Participate - MTAC User Group and Work Group

Request to Lead - MTAC User Group and Work Group

PROCESSING AND DISTRIBUTION: Destinating Delays at South Suburban, IL - Processing and Distribution Center (P&DC)

INFORMATIONAL - Reminder - USPS Mail Flow 101 Webinar