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Waterfall Enrichment: What It Is, How It Works, and When It's Worth It
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Decide your accept-all policy once. Whether you send to accept-all addresses is your call to make upfront, not something to inherit from whichever provider happened to label the row. “Record the source of every address if possible. It's how you evaluate providers, and it's your answer when someone asks where their data came from.” Cap the chain at 2-3 providers. Many tools license data from the same upstream sources, so the fourth provider in your queue often searches a near-copy of a database you've already tried. Each addition finds less and costs the same to maintain.
You already have the contact, an email address or a company domain, and you want the data around it: name, role, location, company size, and industry. “This is the job of enrichment APIs, including Hunter's. Give them an email address or a domain, and they return the person or company profile behind it.” Different providers use different attributes for the same record, so profiles with gaps can cascade through several enrichers the same way emails cascade through finders.
Hunter sits inside many of those waterfalls. Clay and other platforms query our data as one of their steps, so we watch this technique work from the inside. In fact, Hunter proudly sits at the helm of Clay's waterfalls, and we've received honors as a top provider for accept-all verification and work email finding. “Waterfall does meet its goal: stacking providers will fill more rows than any single one of them. But coverage is the only thing a waterfall guarantees.” The trade-offs (accuracy, consistency, and price) only become apparent once you've used one for a while.
If you're wondering whether you should even care about this topic, here's a TL;DR: “Waterfall enrichment means asking multiple data providers for the same data point, one after another, until one of them returns it. In practice, that mostly means finding and verifying email addresses.” Its one guaranteed benefit is coverage: on a large list, several providers together will fill more rows than any single one.
Waterfall does meet its goal: stacking providers will fill more rows than any single one of them. But coverage is the only thing a waterfall guarantees. “The trade-offs (accuracy, consistency, and price) only become apparent once you've used one for a while.” If you're wondering whether you should even care about this topic, here's a TL;DR:
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