Postal Address Verification API

Our postal address verification API can instantly verify mailing addresses in the United States and Canada, ensuring that postal deliveries are always successful.

  • USPS CASS Certified
  • Append Missing ZIP Codes
  • Fast, Accurate Formatting
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Powerful Address Verification Features

Seamlessly build powerful address verification applications with our dynamic address validation API. Verify, standardize, and correct mass addresses. Our robust address validation service API delivers the tools you need to ensure efficient deliveries and more.

Residential Delivery Indicator

Residential Delivery Indicator

USPS RDI, or Residential Delivery Indicator, identifies whether a U.S. address is classified as residential or business.

Proper Case Formatting

Proper Case Formatting

Get data in Proper Case format rather than the default uppercase format for automatic scanning of bar codes.

Carrier Route

Carrier Route

Carrier route codes can be presorted to the carrier route level to take advantage of presort postage discounts.



Ensure correct primary and secondary data to give mailers the ability to sort their mailings in approximate carrier-casing sequence.

Geolocation Data

Geolocation Data

U.S. addresses can yield latitude and longitude, area code, time zone, and daylight savings information as an optional return.

Legislative Data

Legislative Data

Return legislative information, including the congressional district number along with the senate and house district of the address.

Why Use Postal Address Verification

CDYNE’s address verification API is fast and reliable. We have fully redundant server farms that deliver results in a fraction of a second. A trustworthy validation service is crucial if you collect postal address data through a sales or enrollment portal. The service can be programmed to clean customer lists through periodic scrubbing or to maintain integrity at the point of entry. Choose us because we have been experts in verifying mailing addresses since 1999. We are a company you can trust.

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Address Standardization

Automatically update addresses to adhere to the United States Postal Service’s (USPS) standards. This will ensure accurate, successful deliveries.

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Address Correction

Are any of your customers’ original shipping addresses for mail or packages incorrect? If so, our address verification API can automatically correct them.

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Address Validation

Our API compares each customer address with the official USPS database and tries to find a match. If a match is found, then that address is deliverable.

How Postal Address Verification Works

Our USPS address verification API is perfect for companies looking to correct, standardize, and validate mailing addresses while decreasing the amount of undeliverable mail they send out. It doesn’t matter whether the recipient’s location is residential or business, you’ve got complete control with CDYNE’s address validation service.

ROI, Cost, & Data Management

Reach customers the first time and improve the results of mail campaigns. Reduce costs incurred by undeliverable mail and postal returns, and qualify for bulk discounts. Standardize your address data and weed out non-deliverable addresses.

Programmable USPS Address Verification

Our USPS address validator integrates with your website, database, or system using SOAP (Simple Object Access Protocol) or REST (Representational State Transfer) protocols.

Address Verification Dataset Return Values: Example

Appended Information

  • DPV Confirmation: Deliverable
  • RDI: Not a residence
  • IntelligentMailBarCode: ZTVQi
  • CongressDistrictNumber: 04
  • StateLegislativeUpper: 014
  • StateLegislativeLower: 090
  • Longitude: 36.796768
  • Latitude: 76.228590
  • TimeZone: EST
  • AreaCode: 757
  • County: Chesapeake

Default Return Data

  • DPV Return Code System: Comprehensible return code system that confirms the existence of a specific address.
  • LACSLink Processing: Update old rural route addresses with USPS LACSLink processing.
  • POSTNET Delivery Point Barcode: Qualify for additional USPS discounts with barcoding.
  • Intelligent Mail Barcode (IM Barcode): Qualify for additional USPS discounts with barcoding.
  • USPS SuiteLINK: Utilize USPS SuiteLINK for correcting business records with accurate suite information.

Optional Return Data

  • Residential Delivery Indicator (RDI): Avoid residential delivery surcharges with Residential Delivery Indicator (RDI)
  • Proper case formatting: Get data in Proper Case format rather than the default uppercase format
  • Census data: Includes CMSA, FIPS, Census block and Census track number
  • Geolocation data: Includes latitude/longitude, area code, time zone, and daylight savings
  • Legislative data: Includes Congressional district number and State Legislative Upper/Lower
  • Carrier Route (CR): Carrier route codes can be presorted to the carrier route level to take advantage of postage discounts.
  • eLOT®: Qualify for enhanced carrier route presort discounts with eLOT®

Address Verification Pricing

Pick the plan that works best for you.

No hidden fees and no long-term commitment required.

Best in industry pricing with either our unlimited or per transaction pricing. We will not be undersold*. With CDYNE you get the most accurate and advanced Postal Address Verification API at the absolute best pricing anywhere.

Inquire about volume-based discounts.

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Some restrictions apply, contact sales for details.

All Plans Include

  • Residential Delivery Indicator
  • Code Documentation
  • HTTPS Protocol
  • Geolocation
  • Instant Address Verification
  • CASS Certification
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Quality Customer Support

Most address API providers don't have active online support channels customers can speak to when they need it the most, and we understand. That's why we have 24/7, around the clock emergency support for our address verification API service.

Expect fast response times, fast troubleshooting and easy-to-read documentation that will never leave you waiting for answers.

Contact us via live chat, phone or email about our address API today.

Address Verification FAQs

Postal Address Verification (PAV) is an API (Application Programming Interface). It allows a business’s IT department to configure the Web Service on a web page, application or database with a few lines of code. There is no software to buy or install.

Our API delivers address results in a fraction of a second.

We receive updates from USPS once per month.

The API can be consumed with any programming language that supports REST or SOAP. See our Quick Start to see examples and a how-to guide on implementation.

Not at this time. CDYNE offers this API as a web service call requiring some coding to consume the API. However, you can save returned results to a database for your records.

Emergency support is available 24/7. Please see our Contact page for more information.

Read our full list of general and technical FAQs.

Address Verification Your Way

Take the uncertainty out of mailing campaigns with CDYNE’s PAV API. We’ve been providing businesses with top-rated software solutions since 1999.

Volume-Based Pricing

Volume-Based Pricing

With per-transaction pricing and customized plans, our PAV API fits every budget.

Customer Satisfaction

Customer Satisfaction

We strive to provide the best customer service, which is why we offer a SLA.

Great Coverage

Great Coverage

Our PAV API standardizes address all across the U.S., U.S. territories, and even Canada.

Emergency Support

Emergency Support

After-hours emergency? No problem! We offer 24/7 emergency support.

It’s Easy To Get Started

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