Effective July 12, 2026, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), in various sections, to reflect that the Web Tools® Application Programming Interface (API) platform has been replaced with the USPS® API platform.
The Postal Service has deployed a new API Gateway and API Developer Portal to replace the legacy Web Tools API platform (which was retired on January 25, 2026) and is updating the DMM to replace outdated references to Web Tools. Additional information and migration support are available at usps.com/business/web-tools-apis/welcome.htm.
Although these revisions will not be published in the DMM until July 12, 2026, these standards are effective immediately.
Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM)
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100 Retail Mail Letters, Cards, Flats, and Parcels
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140 USPS Marketing Mail Flats Every Door Direct Mail-Retail (EDDM-Retail)
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145 Mail Preparation
1.0 Preparation of EDDM-Retail Flats
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1.3 Delivery Statistics, Sortation, and Bundling
[Revise the first sentence (replacing “web tool” with “online tool”) to read as follows:
EDDM-Retail flats must be separated by delivery route (or Post Office Box section) under 145, using delivery statistics obtained from the EDDM online tool at the website usps.com/business/every-door-direct-mail.htm.***
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500 Additional Mailing Services
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505 Return Services
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3.0 USPS Return Service
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3.1 Basic Standards
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3.1.2 Accounts
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[Revise the second sentence of item g. (replacing the website address) to read as follows:]
g. ***If not using labels generated by the USPS Application Program Interface (API) at developers.usps.com, or Merchant Return Application (MRA), applicants must submit for approval two samples for each label format to the National Customer Support Center (NCSC).***
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600 Basic Standards for All Mailing Services
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608 Postal Information and Resources
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2.0 Domestic Mail
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2.3 Customs Forms Required
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2.3.5 Items Eligible for Deposit or Pickup
[Revise the introductory text (by replacing “Web Tools system” with “USPS API platform”) to read as follows:]
Items under 2.3.1 bearing a computer-generated customs form (e.g., using Click-N-Ship service, an authorized PC Postage vendor, or the USPS API platform) may be deposited through any of the following methods, provided postage is paid by a means other than the use of postage stamps:
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700 Special Standards
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703 Nonprofit USPS Marketing Mail and Other Unique Eligibility
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2.0 Overseas Military and Diplomatic Post Office Mail
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2.5 Enter and Deposit
2.5.1 Items Eligible for Deposit or Pickup
[Revise the introductory text (by replacing “Web Tools system” with “USPS API platform”) to read as follows:]
Items not required to bear a customs form under 2.7.4 and items bearing a computer-generated customs form (e.g., using Click-N-Ship service on usps.com, an authorized PC Postage vendor, or the USPS API platform) may be deposited through any of the following methods, provided postage is paid by a means other than using postage stamps:
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The Postal Service will incorporate these revisions into the July 12, 2026, edition of the online DMM, which is available via Postal Explorer® at pe.usps.com.
— Product Classification,
Product Solutions, 4-2-26
