Waterfall enrichment is a method of finding contact data by querying multiple data providers in sequence, one after another, until a valid result is found. If the first provider doesn't have the data, the system automatically moves to the next one, and so on down the waterfall.
The alternative is relying on a single provider. Any single data provider has gaps in its database, which means a portion of your prospect list returns no results. Waterfall enrichment fills those gaps by combining coverage across multiple sources.
How it works
When you run waterfall enrichment on a contact, the system sends the contact details (name, company, LinkedIn URL) to the first provider. If that provider returns a valid, verified result, the process stops and that data is used. If the first provider returns nothing or an unverifiable result, the system moves to the second provider. This continues until a valid result is found or all providers are exhausted.
The order of providers matters. Higher-accuracy providers go first, with broader-coverage providers further down, so the most reliable data wins when available.
Why it matters
No single B2B data provider covers the full market. Coverage gaps are especially noticeable for smaller companies not yet in major databases, regions outside North America and Western Europe, roles that change frequently, and companies with non-standard email formats.
A single-provider approach might return valid emails for 50-60% of a prospect list. A well-configured waterfall across 4-8 providers can push that to 80-90%. More contacts reached from the same list, without buying more leads.
Waterfall vs single-provider enrichment
Single-provider enrichment is simpler and cheaper per lookup, but you hit its coverage ceiling quickly. Waterfall enrichment costs more per found result but finds contacts a single provider would miss. For most outreach use cases, the higher coverage justifies the cost. An email address not found is a prospect not reached.
How toflow.ai does waterfall enrichment
toflow.ai's Enrichment Agent runs waterfall enrichment across 8+ data sources automatically. You don't configure the waterfall manually. The system queries providers in order and returns the best verified result. Bulk enrichment runs across entire lists with a credit cost preview before processing, so you know the cost before committing.