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APIs enable integration with other applications.

  • REST APIs from give you the ability to automate requests for Certified Mail cover sheets and labels, complete with electronic postage, as well as to pull delivery information, Proof of Acceptance (Electronic), Proof of Delivery (Electronic), and Return Receipt (Electronic). All directly into your enterprise applications.
  • REST APIs also provide you with the ability to integrate Mailing Services, outsourcing the mailing of Certified, Priority and First-Class Mail, while your account retains the transaction data and USPS documents for ten years.
  • The Developer Portal provides a centralized resource for Clients to integrate their own software solutions with services through our REST APIs.
Certified Mail APIs from

Get started quickly!

Getting started is simple. There’s no software to install. No fixed monthly fees. Just a small transaction fee per piece, and we supply the Certified Mail window envelopes at no extra charge. Just tell us how many you need to get started and prefund your postage account (minimum level of $60). You’ll receive the envelopes in 3-5 days and unused postage is always refundable. To sign up, click below. If you have questions, call 888-462-1750. 8am–5pm ET.

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