Business email lookup
A name and a domain in.
An honest answer out.
Email Finder tests how a company actually forms addresses, probes the result against their mail server, and tells you exactly how much it proved — confirmed, accepts-everything, or unconfirmed. Never a green tick it did not earn.
No subscription — pay in Ounie credits10 credits per answernothing found, nothing charged
How the search works
Companies only form addresses a few ways
Almost every business address is one of a handful of shapes built from a first name, a last name, and a domain. We walk the common ones in order, put each candidate to the company's own mail server, and keep the one that survives.
What comes back is the address, the shape it used, and how many candidates were actually tested — so you can see the work rather than take a number on faith.
Candidate shapes
0/8
first.lastfirstflastf.lastfirstlastfirst_lastlastfirstlast
We pin the search to the four shapes that cover roughly 85% of real companies. Testing every possible shape would cost more than the answer is worth, and we would rather tell you we stopped than quietly bill you for a wider guess.
Verification states
Three answers, and only one of them is a yes
Most of this industry collapses these three into a single green badge. The difference between them is the difference between a delivered email and a bounce on your sending domain, so we keep them apart — in the UI, in the API, and in what we charge.
› RCPT TO: <dana.whitfield@northbeam.io>
‹ 250 2.1.5 OK
› RCPT TO: <zzq-not-a-person@northbeam.io>
‹ 550 5.1.1 No such user
The server distinguishes real mailboxes.
The mailbox was confirmed. Send with confidence.
› RCPT TO: <mhale@deltaworks.co>
‹ 250 2.1.5 OK
› RCPT TO: <zzq-not-a-person@deltaworks.co>
‹ 250 2.1.5 OK
It accepts nonsense too. The OK means nothing.
A strong guess, not a confirmation. This is where other tools show a green tick.
› RCPT TO: <p.raman@castlepoint.dev>
‹ 451 4.7.1 Greylisted, try again later
› RCPT TO: <p.raman@castlepoint.dev>
‹ 421 4.7.0 Too many probes
No conclusive answer was reached.
The shape matches how this company forms addresses. Nothing confirmed the mailbox.
A catch-all domain will answer “OK” tozzq-not-a-person@just as readily as to your prospect. Any tool that calls that a verified hit is selling you a coin flip with a tick next to it.
For developers & AI agents
One lookup, four ways to call it
The same endpoint answers a curl, an MCP client, a keyless agent paying in USDC, and the dashboard. Every rail returns the identical shape, and every rail applies the identical honesty rules — an agent gets the same `accept_all` warning a human does.
curl -X POST https://emailfinder.ounie.com/api/lookup \
-H "Authorization: Bearer eml_live_..." \
-H "content-type: application/json" \
-d '{"firstName":"Dana","lastName":"Whitfield",
"domain":"northbeam.io"}'
{
"found": true,
"email": "dana.whitfield@northbeam.io",
"verification": "verified",
"confidence": 0.92,
"pattern": "first.last",
"tested_count": 4,
"flags": { "catch_all": false, "role_account": false },
"credits_charged": 10
}MCP
Add the server to Claude, Cursor, or the Ounie AI Team. Tools: find_email, get_lookup, list_lookups, get_pricing.
https://emailfinder.ounie.com/api/mcpx402
Keyless agents pay $0.12 in USDC on Base. Nothing settles unless an address is found.
POST /api/x402/findCredits
10 Ounie credits per answer, drawn from your shared wallet. A lookup that finds nothing is free.
Refused, never overdrawnCredit math
You pay for an answer, not an attempt
One lookup that returns an address costs 10 Ounie credits — 10 cents. A lookup that finds nothing costs zero, automatically, with no support ticket. There is no subscription and no seat: credits come from the one Ounie wallet shared across every Ounie app.
| Outcome | Credits |
|---|---|
| Verified address returned | 10 |
| Accepts-all address returned | 10 |
| Unverified address returned | 10 |
| No address found | free |
| Lookup engine unavailable | free |
| Reading past lookups | free |
An accepts-all or unverified result still bills: the pattern work was done and the answer is honest about what it is. We would rather charge you for a labelled guess than dress one up as a confirmation.
Questions worth asking
What does “verified” actually mean here?
That the receiving mail server accepted that specific mailbox, and that we confirmed it distinguishes real mailboxes from invented ones. It is the only status that means the address was confirmed. If we could not establish that, you get accepts-all or unverified instead — never a green tick we did not earn.
What is a catch-all domain, and why does it matter so much?
Some domains accept mail addressed to anything at all, real mailbox or not. A probe against such a domain returns “OK” for an address that cannot exist, so acceptance proves nothing. We report those as accepts-all. It is the single most common way email tools mislead people: they take that “OK” at face value and show it as a hit.
Do I pay when nothing is found?
No. A lookup that returns no address settles at zero credits automatically. You pay for an answer, not for the attempt.
Do I pay for an accepts-all or unverified result?
Yes. The pattern work was done and you get a usable answer plus an honest label on it. We price the work, not the confidence — and we would rather bill you for a labelled guess than quietly upgrade it to a confirmation.
Can I look up a Gmail or Outlook address?
No, and we refuse those before charging you. A personal address at a consumer mailbox provider is one of millions of plausible strings, not a company pattern. Guessing at it is not a product.
Can I run a whole list, or enumerate everyone at a domain?
No. Email Finder answers one named person at one named company at a time. There is no bulk enumerator here — sweeping a domain for whoever happens to exist is a different and considerably worse thing to build.
Should I send cold volume to an unverified address?
No. Bounces damage your sending domain's reputation, and that damage outlasts whatever the campaign was worth. Treat unverified as a lead to confirm another way, not a green light.
How do agents use this without an Ounie account?
Through the x402 endpoint: the agent gets a 402 with payment terms, signs, and retries. Nothing settles on chain unless an address is actually found — the check happens before the money moves, because an on-chain settlement has no refund path.
Find one. See what it actually costs you.
10 credits when we find something, nothing when we don't. Sign in with the Ounie account you already have.