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

No hidden fees and no credit card required to get started.

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Trusted CDYNE Customers

  • CollaborateMD
  • Teleflora
  • Quest
  • Newbridge
  • Rooms To Go
  • Southwestern Fundraising
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Why Use Postal Address Verification

Save time, money, and resources by verifying that addresses are deliverable before you send mailings or packages.

API Documentation
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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

Verify Postal Addresses & Return Optional Data

Use this address validation service to return a certified deliverable address.

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Residential Delivery Indicator

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

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Proper Case Formatting

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

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Carrier Route

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

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

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Geolocation Data

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

Congressional building.

Legislative Data

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

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 presort postage discounts.
  • eLOT®: Qualify for enhanced carrier route presort discounts with eLOT®

What Separates CDYNE’s Postal Address Verification from the Competition?

Pay-As-You-Go Subscriptions
Free 250 Free Address Verification Tokens
No Long-Term Commitment or Hidden Fees
Customer Support
Dedicated Account Manager
Emergency Support
Live Chat, Phone, & Email Support
Talk To An Expert

Address Correction Pricing

Pick the plan that works best for you.

No hidden fees and no long-term commitment required.

  • Volume-based pricing
  • $0.03/transaction standard
  • $9.99/month API fee

Inquire about volume-based discounts.

Select your plan and start using PAV today!

Sign Up Now

All plans include:

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

Custom plan packages are also available featuring volume-based discounts, varying levels of technical support, and more.

Why Use CDYNE’s Postal Address Verification API?

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.

Get 250 Free Address Verification Credits

First-Time Purchases Only

  • DAYS




Save time and money while boosting successful delivery rates for business or residential locations. CDYNE’s PAV API is easy to use, fast, and accurate.

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Our Support Team Cares

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Let Us Serve You

We’re constantly striving to provide quality support for all customers, seven days a week. Expect fast response times, fast troubleshooting, and easy-to-read documentation that will never leave you waiting for answers. Get in touch with us using live chat, phone, or email.

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Postal Address Verification Leaders

We’ve been rated 5 out of 5 stars on Capterra, GetApp, Google and Facebook – based on 35+ reviews.

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Award-Winning Company

Postal Address Verification API is powered by CDYNE Corporation. CDYNE has been ranked in the Inc. 5000’s top 5000 companies in America six times in a row from 2012–2018. We’re passionate about providing you with the best services in the industry and proving our value by driving real results.

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250 Free Address Verification Tokens

All first-time customers will receive 250 FREE address verification tokens when they sign up for PAV API!

Let’s Do This!