Apollo.io›Apollo.io› offers Waterfall Enrichment

Waterfall Enrichment combines Apollo data on 240M+ contacts and 30M+ companies with 20+ partner sources to complete records with emails, phone numbers, and company fields without leaving Apollo. Users choose the sources and their order, or bring their own vendor. Enriched records flow into workflows, sequences, dialing, CRM sync, or the API.

Built-in email and phone validation is designed to reduce bounces and improve deliverability and connect rates. The offering sits in Apollo's data layer alongside first-party data unification, intent signals, and visitor identification.