Email Deliverability Audit API

MCP Server x402 License: MIT

Audit email domain deliverability: SPF, DKIM, DMARC, MX records, score 0-100. 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-deliverability": {
      "url": "https://email-deliverability.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://email-deliverability.api.klymax402.com/api/audit?domain=..."
# -> 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_audit_deliverability	GET	/api/audit	$0.005	Audit email deliverability for a domain — checks SPF, DKIM, DMARC, MX records

email_audit_deliverability

Use this when you need to audit email deliverability for a domain. Checks SPF record validity, DKIM selectors (google, default, selector1), DMARC policy, and MX records. Returns a deliverability score 0-100 with specific recommendations to improve inbox placement. Do NOT use for email validation — use email_verify_address. Do NOT use for email finding — use email_find_by_name.

Parameters

Name	Type	Required	Description
domain	string	yes	Domain to audit (e.g. example.com, gmail.com)

Example agent prompts

• "Audit email deliverability for a 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)

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