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"
    }
  }
}

Related MCP server: Prospector 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

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

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

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