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

Address1

27 E Cota Ave

Address2

City

Santa Barb

State

Calufurnia

ZIP

93100

The Result

corrected

appended

Address1

27 E Cota Street

Address2

Service Objects

City

Santa Barbara

State

California

ZIP

93101-7603

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.

Integrations

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

Reliable

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.

Some of the world's biggest brands rely on Service Objects

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