Online Audience Builder API

Online Audience Builder API Overview

Online Audience Builder

Datafinder's Online Audience Builder API service enables you to programmatically append extended complete contact information to your customer or prospect list. Fill in the alternate missing contact information such as full names, alternate email addresses, phone numbers, and postal addresses.

Please note: Emails and other contact data supplied for an online audience are not appropriate for direct communication marketing campaigns. Maintain your IP reputation and ability to send emails by using only Versium-validated emails for direct campaigns. You can get validated emails with our Consumer Email append. For more information, see Best Practices for Email Campaigns.


Our versatile API service supports multiple contact Inputs including any combination of:

  • Full Name
  • Email Address
  • Phone Number
  • Postal Address
  • Additional input options are discussed in the API documentation


The Online Audience Builder Append API provides the following Outputs:

  • Alternate Phone Numbers
  • Alternate Postal Addresses
  • Alternate Email Addresses

Try out the Datafinder Online Audience Builder APIs

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