Provider ordering matters more than most people think. The waterfall stops at the first "valid" result, so your most accurate provider should go first.
What the benchmarks say:
A test of 9,000+ contacts across multiple providers found segment-specific strengths:
- US SMBs: Findymail achieves the best balance with 77% coverage and ~60% validity
- European enterprise: Hunter leads with 92% accuracy
- General B2B: Hunter, FullEnrich, and Findymail together produce 2-3x better results than any single provider
Community-tested orderings:
For general B2B outbound, practitioners in the Clay community recommend:
- Findymail first (94.99% data quality in marketplace ratings)
- LeadMagic second (97.02% accuracy, catches what Findymail misses)
- Hunter or Prospeo as fallback
Important: verify after the waterfall. The waterfall finds emails, but it can stop on a technically valid email that belongs to the wrong person. Add a name-matching formula or verification step after enrichment.
Cost consideration: Each attempt costs credits regardless of outcome, so put your highest-accuracy provider first to minimize wasted attempts downstream. Some providers like Prospeo only return verified emails, which saves credits on verification.