| API | Description | Category | Date |
|---|---|---|---|
| AddressDoctor | Street address validation service | Shipping | 2012-08-14 |
| Autoaddress | Irish address validation and geocoding service | Shipping | 2012-03-16 |
| BlueMailCentral Postal | Digital mail service | Utility | 2011-03-21 |
| Canada Post | Canadian postage and mailing service | Shipping | 2012-08-13 |
| DocMail | Send physical postal mail via a webservice/website | Utility | 2009-06-17 |
| Endicia Label Server | Web based postage service | Shipping | 2012-02-13 |
| Experian QAS Address Validation | Street address validation service | Shipping | 2012-05-01 |
| L-Vin Post | German letter mailing service | Other | 2012-11-15 |
| ParcelMonkey | Parcel Delivery Service | Shipping | 2012-07-31 |
| PostalMethods | Web-to-Post service for sending letters | Messaging | 2008-07-03 |
| Royal Mail E*Pro | Online docketing service | 2012-08-01 | |
| SendWrite | Paper card sending service | Social | 2011-11-15 |
| ServiceObjects DOTS NCOA Live | U.S. change-of-address (COA) update service | Reference | 2012-11-29 |
| Sincerely | Postcard and photo printing application | Photos | 2012-02-28 |
| SSW Australian Postcode | Australian address checking service | Tools | 2012-05-21 |
| Stamps.com | Shipping label creation service | Shipping | 2012-11-19 |
| TryPaper | Document printing and mailing service | Tools | 2013-02-18 |
| USPS Merchant Returns | U.S. Postal Service return shipping service | Shipping | 2012-12-20 |
| ViaPost | Send postal mail from electronic documents | Other | 2009-05-26 |
| Zumbox | Digital postal mail service | Other | 2011-08-12 |
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