Effective April 2, 2026, the Postal Service™ is revising various sections of Mailing Standards of the United States Postal Service, International Mail Manual (IMM®) 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to replace the legacy Web Tools API platform (which was retired on January 25, 2026) and is updating the IMM to replace outdated references to Web Tools. Mailers can find more information and migration support by visiting usps.com/business/web-tools-apis/welcome.htm.
Mailing Standards of the United States Postal Service, International Mail Manual (IMM)
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1 International Mail Services
110 General Information
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116 Trademarks of the USPS
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Exhibit 116.1 USPS Trademarks in the IMM
[Remove “USPS Web Tools” from the list.]
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2 Conditions for Mailing
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220 Priority Mail Express International
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225 Mail Entry and Deposit
225.1 Place of Mailing
225.11 Items Eligible for Deposit or Pickup
[Revise the text (replacing “USPS Web Tools system” with “USPS API platform”) to read as follows:]
Priority Mail Express International items bearing a computer-generated customs form with customs data that has been electronically transmitted (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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230 Priority Mail International
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235 Mail Entry and Deposit
235.1 Place of Mailing
235.11 Items Eligible for Deposit or Pickup
[Revise the text (replacing “USPS Web Tools system” with “USPS API platform”) to read as follows:]
Priority Mail International items bearing a computer-generated customs form with customs data that has been electronically transmitted (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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240 First-Class Mail International
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245 Mail Entry and Deposit
245.1 Place of Mailing
245.11 Items Eligible for Deposit or Pickup
[Revise the text (replacing “USPS Web Tools system” with “USPS API platform”) to read as follows:]
First-Class Mail International items bearing a computer-generated customs form with customs data that has been electronically transmitted (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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250 First-Class Package International Service
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252 Eligibility
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252.2 Electronic USPS Delivery Confirmation International Service (E-USPS DELCON INTL)
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252.25 Price Eligibility
[Revise the last sentence (by replacing “USPS Web Tools” with “USPS APIs”) to read as follows:]
***Electronically generated customs forms that are not generated with PC Postage or a permit imprint, or forms electronically generated by USPS APIs or Click-N-Ship service, are charged the retail price.
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255 Mail Entry and Deposit
255.1 Place of Mailing
255.11 Items Eligible for Deposit or Pickup
[Revise the text (replacing “USPS Web Tools system” with “USPS API platform”) to read as follows:]
First-Class Package International Service items bearing a computer-generated customs form with customs data that has been electronically transmitted (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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Although effective April 2, 2026, the Postal Service will incorporate these revisions into the July 12, 2026, edition of the online IMM, which is available via Postal Explorer® at pe.usps.com.
— Product Classification,
Product Solutions, 4-2-26
