POST/v1/email/similar

Similar Domains API

Discover companies and domains similar to any target domain.

Give a domain and get back a list of similar companies — each with its domain, name, and industry. Use it to expand a target account list, map a competitive landscape, or find lookalike prospects from your best customers.

Full Docs Get API Key — Free $5 Credit $0.02 / call

Try it live

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

POST/v1/email/similarsimilar$0.02/call

Response

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

{
  "data": {
    "domains": [
      {
        "domain": "shopify.com",
        "industry": "Information Technology and Services",
        "name": "Shopify"
      },
      {
        "domain": "paypal.com",
        "industry": "Information Technology and Services",
        "name": "PayPal"
      },
      {
        "domain": "adyen.com",
        "industry": "Financial Services",
        "name": "Adyen"
      },
      {
        "domain": "t1payments.com",
        "industry": "Financial Services",
        "name": "T1 Payments"
      },
      {
        "domain": "kashier.io",
        "industry": "Financial Services",
        "name": "Kashier"
      }
    ]
  },
  "ok": true
}

Features

✓

Lookalike company list

Returns domains related to your target, each with the company name and industry, so you can grow a prospect list from a single seed account.

✓

Industry context per result

Every similar domain carries its industry classification, letting you filter to the exact vertical you sell into.

✓

Competitive landscape mapping

Seed the endpoint with a competitor to surface the field of companies playing in the same space.

✓

Feeds account-based workflows

Chain results into Domain Search and enrichment to build fully qualified lookalike lists automatically.

Use cases

Lookalike Prospecting

Turn your best customers into seed domains and discover similar companies to target next.

Competitive Research

Map the competitors and adjacent players around any company in a market.

TAM Expansion

Grow a total-addressable-market list by branching out from known accounts.

Quick start

Copy this snippet and start making calls.

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

The similar domains API — lookalike companies from any seed

The Similar Domains API returns companies related to a target domain, each with its name and industry. Seed it with a best customer to find lookalike prospects, or with a competitor to map the field around them.

At $0.02 per call with $5 of free credit and no minimums, it's a pay-per-lookup alternative to Clearbit's similar-companies data. Chain the results into Domain Search and enrichment to build qualified lookalike lists under one key.

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

“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
Marcus T.
SEO Platform Founder

“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
Priya S.
Full-Stack Developer

“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Jake R.
Indie Hacker

Frequently asked questions

Each API call costs $0.02. 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/similar. 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.