How to Use USPS Address Verification API: Developer's Guide

The USPS Address Verification API is part of USPS Web Tools and helps verify U.S. addresses for standardization, delivery eligibility, and ZIP+4 code assignment.

Step 1: Register for USPS Web ToolsCreate an account on the USPS Web Tools portal to obtain your API credentials.

Step 2: Read the API DocumentationUSPS provides detailed developer guides outlining request formats, XML structures, and response elements.

Step 3: Create API RequestsUse XML to submit address lookup requests. Example:

Step 4: Parse the ResponseThe API will return standardized address info, including ZIP+4 codes and delivery points.

Tips:

• USPS does not support JSON; use XML only.

• Works for U.S. addresses only.

• Ideal for shipping forms, CRMs, and ecommerce checkouts.

By integrating the USPS Address Verification API, you ensure accurate delivery and reduce return mail.

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