POST/v1/email/sources

Email Sources API

See the public web pages where an email address appears.

Send an email address and get back the list of public web pages where it has been found, each with the source domain and the dates it was first and last seen. Use it to audit an email's provenance and gauge how trustworthy a discovered address is.

Full Docs Get API Key — Free $5 Credit $0.01 / call

Try it live

Fill in the fields and hit Run to see a real response.

POST/v1/email/sourcessources$0.01/call

Response

Example response — hit "Send Request" to see a live result

{
  "data": {
    "sources": []
  },
  "ok": true
}

Features

✓

Public source list per email

Returns the domains where the address appears on the open web, so you can see the evidence behind a discovered email rather than taking it on faith.

✓

First-seen and last-seen dates

Each source carries firstSeen and lastSeen timestamps, letting you judge whether an address is current or stale.

✓

Provenance for compliance

Document exactly where a contact was sourced from — useful for outreach compliance and data-hygiene records.

✓

Cheapest call in the suite

At $0.01 per lookup it's an inexpensive way to add a trust signal to any email you've found or been given.

Use cases

Email Verification Support

Cross-check a discovered email's legitimacy by seeing how many independent domains reference it.

Data Provenance

Keep an auditable record of where each contact in your database was sourced.

Freshness Checks

Use last-seen dates to spot addresses that may have gone stale.

Quick start

Copy this snippet and start making calls.

const res = await fetch('https://api.yepapi.com/v1/email/sources', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "email": "[email protected]"
  }),
});
const data = await res.json();
console.log(data);

The email sources API — provenance for any address

The Email Sources API returns the public web pages where an email address has appeared, each with the source domain and first- and last-seen dates. It's the trust signal behind a discovered email — proof of where it came from and whether it's still current.

At $0.01 per call, it's the cheapest endpoint in the Email API and an easy add-on to any verification or finding workflow, all under one YepAPI key with $5 of free credit to start.

Start making API calls in 30 seconds

$5 free credit on signup. No credit card required. Pay per call.

Get API Key — Free $5 Credit

What developers say

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Indie Hacker

Frequently asked questions

Each API call costs $0.01. No monthly minimums or subscriptions — you only pay for what you use.

Sign up for a free API key, then send a POST request to /v1/email/sources. Check the code example above for a ready-to-use snippet in JavaScript, cURL, or Python.

YepAPI bundles SEO, AI, and web scraping APIs under one key with no monthly minimums. You get lower per-call pricing, a unified dashboard, and one billing account instead of managing multiple providers.