Email Finder APIs
Email finder APIs guess and verify a professional email address from a domain or a person's name. Hunter and Tomba both search by company domain and verify results, with Hunter adding confidence scores and Tomba also accepting a LinkedIn profile. NioLeads works from a name plus company domain or LinkedIn URL and is offered as a free trial rather than a free tier.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
HunterFinds and verifies professional email addresses for a domain or company, with confidence scores. Business & Productivity › Company Data | Freemium | API key | JSON | <100/day | Live |
NioLeadsFinds and verifies business email addresses from a person's name and company domain or LinkedIn profile. Business & Productivity › Company Data | Free trial | API key | JSON | — | Untested |
Tomba Email FinderFinds and verifies professional email addresses for a company domain, name or LinkedIn profile. Business & Productivity › Company Data | Freemium | API key | JSON | — | Untested |
HunterFreemiumLive
Finds and verifies professional email addresses for a domain or company, with confidence scores.
API key · JSON
<100/day
llms.txt
NioLeadsFree trialUntested
Finds and verifies business email addresses from a person's name and company domain or LinkedIn profile.
API key · JSON
—
no machine-readable spec
Tomba Email FinderFreemiumUntested
Finds and verifies professional email addresses for a company domain, name or LinkedIn profile.
API key · JSON
—
llms.txt
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Choosing an Email Finder API
Is there a free Email Finder API?
Yes. Hunter and Tomba Email Finder have a free tier alongside paid plans.
Which Email Finder APIs work without an API key?
All of them need a key or account. Hunter and Tomba Email Finder give one out free when you sign up.
Can I use Email Finder APIs in a commercial project?
Hunter and Tomba Email Finder permit commercial use. NioLeads restricts it, for example to non-commercial or attributed use, so read the terms first.
Broader: Company Data APIs · Business & Productivity APIs
More in Company Data: Company Enrichment APIs · Company Registry Lookup APIs · B2B & Lead Data APIs