HEATKEYS

SmartyStreets is the leading mailing list software and address hygiene services provider. We provide on-demand USPS CASS Scrubbing and postal address verification, validation, certification, and standardization services that are CASS-Certified(TM) by...

Get shipping rates, buy stamps, print postage, track a package, look up a ZIP Code? - Find the mailing products and services you need at USPS.com.

Address verification from Experian QAS enhances USPS postal address data quality with front-end and back-end data verification software products.

ProgrammableWeb.com keeps you up to date with web mashups and APIs: what

For data quality management tools, mailing software, consumer and residential mailing lists, address verification, and NCOA services, visit MelissaData.com, a leading source of cost effective, direct marketing database solutions.

Web services that validate, update, correct and enhance contact information in real-time within any application.

StrikeIron provides an on-demand Web-based infrastructure for delivering business data to any Internet-connected system, including Software as a Service (SaaS) applications, websites, mashups, spreadsheets or core enterprise systems.

Technical resources for developers of integrations and connectors for Avalara's AvaTax Sales Tax Automation Suite.