Email Finder API

Find professional email addresses from name + company domain. Tests 15+ patterns against MX records with confidence scoring. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "email-finder": {
      "url": "https://email-finder.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://email-finder.api.klymax402.com/api/find?domain=...&firstName=...&lastName=..."
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
email_find_by_name	GET	/api/find	$0.012	Find a person's email from their name and company domain
email_find_by_name	POST	/api/find	$0.012	Find a person's email from their name and company domain (POST variant)

email_find_by_name

Search for people/contacts matching criteria and find their professional email address from name and company domain. Alternative to Apollo people-search at 4x lower cost. Returns the most likely email with confidence score after testing 15+ patterns against MX records.

Parameters

Name	Type	Required	Description
domain	string	yes	Company domain (e.g. company.com)
firstName	string	yes	Person's first name (e.g. John)
lastName	string	yes	Person's last name (e.g. Doe)

Example response:

{"email":"john.doe@stripe.com","confidence":92,"pattern":"first.last","allCandidates":[{"email":"john.doe@stripe.com","score":92},{"email":"jdoe@stripe.com","score":75},{"email":"john@stripe.com","score":60}],"domain":"stripe.com","mxValid":true}

When to use: sales outreach, cold emailing, or building prospect contact lists. Essential for searching for people/contacts and finding decision-maker emails when you only know their name and company. Drop-in replacement for Apollo people search.

Not for: email validation (use email_verify_address), company data (use company_enrich_from_domain), person data from email (use person_enrich_from_email).

email_find_by_name

Search for people/contacts matching criteria and find their professional email address from name and company domain. Alternative to Apollo people-search at 4x lower cost. Returns the most likely email with confidence score after testing 15+ patterns against MX records. POST variant of email_find_by_name -- same params passed as JSON body instead of query string.

Parameters

Name	Type	Required	Description
domain	string	yes	Company domain (e.g. company.com)
firstName	string	yes	Person's first name (e.g. John)
lastName	string	yes	Person's last name (e.g. Doe)

Example response:

{"email":"john.doe@stripe.com","confidence":92,"pattern":"first.last","allCandidates":[{"email":"john.doe@stripe.com","score":92},{"email":"jdoe@stripe.com","score":75},{"email":"john@stripe.com","score":60}],"domain":"stripe.com","mxValid":true}

When to use: sales outreach, cold emailing, or building prospect contact lists. Essential for searching for people/contacts and finding decision-maker emails when you only know their name and company. Drop-in replacement for Apollo people search.

Not for: email validation (use email_verify_address), company data (use company_enrich_from_domain), person data from email (use person_enrich_from_email).

Example agent prompts

• "Search for people/contacts matching criteria and find their professional email address from name and company domain"
• "Search for people/contacts matching criteria and find their professional email address from name and company domain"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)
• Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT