Create a subscription to receive tracking events by mailer ID or tracking number. Manage all tracking subscriptions, in one place, by providing your server URL to receive Postal Service tracking events.

Receive a comprehensive list of pricing, service standards, and shipping options for USPS products within a single API call.

The Intelligent Mail Container barcode (IMcb) provides visibility at the mail aggregate level. It is used on mailer-generated pallet labels to uniquely identify pallets and similar containers (i.e. All Purpose Containers, hampers, pallet boxes, etc.) in addition to identifying the mail owner and, it provides a link between the electronic mailing record and the physical mail aggregate.

The Addresses API validates and corrects address information, eliminating errors, improving package delivery service and package pricing. This suite of APIs provides different utilities for addressing components. The ZIP Code lookup finds valid ZIP Codes for a City and State.  The City/State lookup provides the valid cities and states for a provided ZIP Code.  The Address Standardization API validates and standardizes USPS domestic addresses, city and state names, and ZIP Codes in accordance with USPS addressing standards.  The USPS address standard includes the ZIP+4, signifying a USPS delivery point, given a street address, a city and a state. 

Shipment Confirmation Acceptance Notice(SCAN) form allows integrators to link multiple domestic and international labels through one Electronic File Number (EFN) and physical SCAN Form (PS Form 5630). 

The API supports customers scheduling a carrier to pick up your packages on the next USPS delivery day (Monday through Saturday, excluding holidays) for free. Carrier Pickup is available for sending packages using Priority Mail Express, Priority Mail, First Class Package Service Commercial, international delivery services, or for returned merchandise. You are able check availability, schedule, change, cancel and inquire on a carrier pickup. 

This API returns tracking status and related details for a given USPS package, including scan events and their date, time, and location. The Tracking APIs allow you to integrate the status of your shipment into your customer-facing experience and internal fulfillment processes that will benefit your company by:

• Providing your customers with the latest status and delivery expectations while keeping them within your company’s or organization’s website.

• Integrating status and delivery information for incoming packages or customer returns directly into your systems and processes so that you know when a package will arrive at your facilities.

This API supports the service standards for the number of days between the acceptance and delivery of a piece of mail that the Postal Service™ considers to be timely delivery. Service standards are delivery benchmarks for how long customers can expect for the Postal Service to deliver different types of mail from origin to destination — Point A to Point B. Service standards are not necessarily the same as the actual service performance.

Caches payment account information so that it is entered once then used to create multiple labels. 

Your exclusive access to USPS APIs is protected using OAuth 2.0 industry standards.

All USPS APIs require an OAuth 2.0 access token to be conveyed in the 'Authorization' header, using the 'Bearer' token scheme.

Once you sign-in to the API developer portal, you may get the OAuth credentials you will need to register your application 'Add App'. See "Getting Started" for further information about: signing-in, registering your application, and additional USPS account credentials you will need to integrate your application with USPS APIs.

You are responsible for securing the application credentials once issued. Please contact USPS if your credentials have been disclosed to external parties and we will issue new credentials.