Clay pulls contact data from 50+ sources - but accuracy varies per source. BounceZero adds a real-time verification layer so your waterfall-enriched emails are deliverable before your sequence fires.
Clay's waterfall runs through Clearbit, Apollo, Hunter, Prospeo and dozens more until it gets a hit. But a "hit" only means a provider returned an address - not that the mailbox exists today.
Each source in your Clay waterfall has its own database age and guess logic. An email that Apollo returns as "verified" may have been checked 18 months ago - and 22% of B2B addresses decay every year.
Several waterfall providers generate emails from name patterns ([email protected]) rather than confirming them. Clay marks the column as filled - your sequence tool treats it as sendable.
Fire a Clay-built list through Smartlead, Instantly or Outreach with a 6-8% invalid rate and mailbox providers start throttling you. One bad batch can undo weeks of warm-up.
BounceZero doesn't trust the waterfall's word for it. Every address goes through a full live verification pipeline - with timing that varies by provider and verification path via API, or minutes in bulk.
A live SMTP conversation with the receiving server confirms the exact mailbox exists - not just the domain. Catches pattern-guessed addresses from waterfall providers.
23% of B2B domains accept everything, which fools single-probe verifiers. Our 3-probe method separates genuinely valid mailboxes from accept-all noise.
Flags info@, sales@ and admin@ addresses that enrichment sources return when they can't find a personal contact - poison for personalized sequences.
Identifies temporary and throwaway domains that occasionally surface in scraped or user-submitted data sources within Clay tables.
Confirms the domain can actually receive mail. Companies get acquired, rebrand, and migrate - stale enrichment databases don't notice. We check live.
ML-based screening for recycled addresses turned into traps. One trap hit from a Clay list can land your sending domain on a blocklist.
Two ways to plug in: real-time via an HTTP API column inside Clay, or bulk export-verify-import. Here's the bulk workflow - from enriched table to send-ready list in under 15 minutes.
Run your enrichment columns as usual - Clearbit, Apollo, Hunter, Prospeo, or whatever waterfall order you've set. Let Clay fill the email column for every row.
Use Clay's export action to download your table (or just the email + ID columns) as a CSV. Any column layout works - BounceZero auto-detects the email field.
Drag the CSV into your BounceZero dashboard. Up to 1,000,000 addresses per dashboard job - a typical 10K-row Clay table finishes in 5-10 minutes.
Every row comes back with a verdict and confidence score. Filter out invalids and spam traps; decide your own risk tolerance on catch-alls.
Re-import as a new table or merge via your row ID. Add a "verification status" column so downstream automations only trigger on valid emails.
Send the verified segment to Smartlead, Instantly, Outreach or any tool connected to Clay - with a bounce rate under 0.5% instead of 6-8%.
Prefer real-time? Add BounceZero as an HTTP API enrichment column directly inside your Clay table - provider-dependent response time per row.
Clay credits cost real money per enriched row. Spending $3 per 1,000 rows to make sure those credits convert into deliverable emails is the cheapest insurance in your stack.
Curious what bounces actually cost you? Try the ROI calculator.
New to verification? Start with the complete email verification guide.
Yes, two ways. For real-time verification, add BounceZero as an HTTP API enrichment column inside your Clay table - each row gets verified with timing that varies by provider and verification path as the table runs. For larger tables, export your email column as CSV, run it through BounceZero bulk verification (up to 1,000,000 addresses per dashboard job), and import the cleaned results back into Clay.
Because "found" isn't the same as "valid." Waterfall providers like Clearbit, Apollo and Hunter mix confirmed data with pattern-based guesses, and their databases age - around 22% of B2B email addresses decay every year as people change jobs. BounceZero verifies each address against the live mail server at the moment you send, not whenever the provider last checked.
Yes. Use Clay's HTTP API enrichment column to call the BounceZero verification endpoint with the email from each row. Our response time varies by provider and verification path, so even large tables run through quickly. You get back a status (valid, invalid, catch-all, risky) plus a confidence score you can use in Clay formulas and conditional runs.
Around 23% of B2B domains are catch-all - they accept mail for any address, which makes single-probe verifiers return false positives. BounceZero uses a 3-probe catch-all detection method that distinguishes genuinely existing mailboxes from accept-all behavior, so you can make an informed decision instead of guessing.
Verification costs $3 per 1,000 emails, so a 10,000-row Clay table costs about $30 and processes in 5-10 minutes. Every account also includes 100 free verifications per month with no credit card required, which is enough to test the workflow on a sample of your table before committing.
It helps, but it's not equivalent. Built-in validation steps typically run a single check per provider and inherit that provider's catch-all blind spots. BounceZero runs six independent checks - mailbox existence, 3-probe catch-all, role, disposable, MX, and spam trap detection - at up to 99.8% accuracy in internal testing on SMTP-verifiable addresses versus the ~95% industry benchmark. On a 10K list, that difference is hundreds of bounces avoided.
Verify your next Clay export before the sequence fires. 100 free verifications every month - no credit card, results in seconds.
up to 99.8% accuracy in internal testing on SMTP-verifiable addresses - $3 per 1,000 verifications - provider-dependent API response time
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