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Issues with MillionVerifier API: IP Address Blocked Despite Whitelisting | Clay

Issues with MillionVerifier API: IP Address Blocked Despite Whitelisting

·Oct 02, 2025 09:55 AM·

Getting "IP address blocked" on every MillionVerifier API call. I've whitelisted my IP and Clay's IP. Still getting the same message.

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6 comments

· Sorted by Oldest

Joseph G.
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It's a templated API call that I've used millions of times, it's definitely correct
Joseph G.
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API key is in the templated URL, which again I've used millions of times before - https://api.millionverifier.com/api/v3/?api={API_KEY}&email={EMAIL}&timeout=60
Joseph G.
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lol
Nik G.
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Joseph G. did you ever figure this out? I keep running into it. My IP isn’t on the blocklist here either: https://app.millionverifier.com/api
Clay Support
APP
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Since you're still experiencing the "IP address blocked" error with MillionVerifier despite whitelisting IPs, this could be an API key authentication issue. Verify your API key is still valid and hasn't expired or been regenerated. [1]
Could you copy and paste your JSON configuration for the MillionVerifier API call so I can help troubleshoot the specific setup?
Clay Support
APP
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I’m sorry this issue is persisting and I’m here to help if you need further assistance with the MillionVerifier API. Would you like to share more details about your current API setup or any recent changes so we can continue troubleshooting?