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Apollo Verified Email vs Clay Waterfall Accuracy: Why They Disagree on New Domains and Which One to Trust

I ran 500 contacts through both Apollo and a Clay waterfall — same seed list, same week — and got conflicting verification states on 23% of records.

  • 23% of 500 contacts showed conflicting verification states between Apollo and Clay.
  • Disagreement primarily occurs on newly-founded .ai and .io domains.
  • Apollo's verification is a database confidence score, not real-time SMTP check.

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