USPS Certified Address Validation API

Correct and enhance US
mailing addresses in real-time

Test drive our USPS CASS-Certified Address Validation API.

Instantly verify, correct and standardize US addresses
with near-perfect match accuracy with USPS.
Sign up for a free API key.

Fast. Accurate. Secure.

Our full-featured, US Address Validation API is built for today’s applications. With sub-second response times, you can instantly correct and append addresses to meet USPS standards.

How it Works.

Integrate our simple API and submit your addresses for validation. Our CASS-certified service will verify, correct and append your addresses, returning results formatted to meet USPS standards.

Input Provided


27 E Cota Ave



Santa Barb





The Result




27 E Cota Street


Service Objects


Santa Barbara





Simple API

Supported with comprehensive documentation and support for most major programming languages.

USPS CASS-Certified

Over 10 years of near-perfect match and correction accuracy that exceeds USPS standards.

Full Featured

Validates and corrects difficult addresses and appends: ZIP+4, DPV, RDI, SuiteLink, barcode and more.

Developer Support

Developer guides, sample code, sample data, and support directly from the developers that built the API.


Easily integrated with major CRMs, sales and marketing platforms, like Salesforce, Marketo and Hubspot.


99.999% Uptime Guaranteed. Exceptional 24/7/365 Customer Support.
We also offer Canadian and International address validation services.

Simple to Integrate.

Our APIs are built by developers, for developers, with comprehensive documentation, developer guides, sample code, sample data and everything you need to get up and running as fast as possible

Watch a short video (1:03) on how easy it is to integrate our API.

We offer sample code for most major programming languages.
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Some of the world's biggest brands rely on Service Objects

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