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