uChecker
FreemiumLiveLast verified 24 Sept 2026
Validates whether an email address exists via SMTP/DNS checks, singly or in bulk up to millions of addresses.
Example request
curl -s 'https://api.uchecker.net/api/v1/account/balance' -H 'x-api-key: $API_KEY'
Free tier, in plain English
New accounts get 100 free validations; after that, checks are billed per email from a prepaid credit balance.
Alternatives in Email Validation
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