This article explains how Negotiated Service Agreement (NSA) customers use a USPS Enterprise Payment Account (EPA) with your Endicia account through Stamps.com. To do so, you will need to create an EPA within the USPS Business Portal (formerly the Customer Onboarding Portal (COP)).
New to the USPS Business Portal and NSA Rates? Please see our page for .
Already have a USPS Business Portal and NSA Rates? See our page for : Link Your USPS Negotiated Service Agreement (NSA) Account to ShipStation.
This table defines important abbreviations used in this article.
|
Abbreviation |
Term |
Definition |
|---|---|---|
|
NSA |
Negotiated Service Agreement. |
A customized, contractual agreement between the Postal Service and high-volume mailers that provides discounted rates or flexible classifications in exchange for increased mail volume. |
|
EPA |
Enterprise Payment Account. |
The single, centralized account (the 10-digit number) that a customer creates within the EPS platform. Starting early 2026, this number will be mandatory for NSAs to link their USPS contract rates to their Auctane account. Used for:
|
|
EPS |
Enterprise Payment System |
The USPS payment platform that manages all business postal transactions. The system is responsible for hosting and managing the individual EPA. |
|
ACH |
Automated Clearing House |
An electronic network for processing bank-to-bank transfers, typically used for low-cost, direct payment from a checking or savings account. Endicia offers this payment method free of surcharge to customers. |
|
CC |
Credit Card |
Credit Card is available as an optional payment. |
What is an EPA?
An Enterprise Payment Account (EPA) is a payment account you create directly with USPS. It is part of the USPS Enterprise Payment System (EPS).
Understanding Your Enterprise Payment Account (EPA)
When you set up your USPS Business Account within the USPS Business Portal, you will be asked to create an Enterprise Payment Account (EPA) with USPS. This EPA is required to purchase USPS labels within Auctane with your USPS rates.
How does Endicia use your EPA?
After you create your EPA with USPS, you’ll return to Endicia and enter your EPA number in our system. In most cases, Endicia will process your payments for USPS labels. This means you’ll see your available balance within your Endicia account, and Endicia will handle all payment processing for your USPS labels on your behalf.
To obtain an NSA (Negotiated Service Agreement) Promo Code, you must contact a USPS Sales Representative directly and follow their formal negotiation process. NSAs are personalized agreements for high-volume business mailers, and promo codes are not publicly available.
How to Contact a USPS Sales Representative
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Use the Contact Directory on PostalPro. The USPS website for commercial mailers has a contact directory with specific phone numbers and email addresses for various services, including the Mailing and Shipping Solutions Center (MSSC) for commercial customers.
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Email the Pricing Strategy team. For initial inquiries, send an email to nsa@usps.com to begin the process. The email should include a proposal with reasons for requesting an NSA.
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Call the Pricing Strategy team. You can contact the Pricing Strategy division directly by calling 202-268-7284.
Prepare Your NSA Proposal
Negotiated Service Agreements are not instant discount codes but are the result of a formal process. Your request will require a detailed proposal outlining the following:
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The reasons for seeking an NSA.
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Supporting documentation.
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Information that meets the general requirements of the NSA program.
Before having a substantive discussion, you will be required to sign a nondisclosure agreement.