Email Deliverability X402
About
Audit email domain deliverability: SPF, DKIM, DMARC, MX records, score 0-100. -- x402 micropayment API + MCP server for AI agents
Details
- Author
- Br0ski777
- Downloads
- 249
- Categories
- Communication, API
Jump to
- Pay‑per‑call via x402 (USDC on Base L2), no signup or API key required
- Checks SPF record validity, DKIM selectors, DMARC policy, and MX records
- Returns a deliverability score 0–100 with specific recommendations
- Part of the klymax402 marketplace with 100 x402 micropayment APIs
- No rate limits – only the per‑call fee of $0.005
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Email Deliverability X402Command (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Configure the server in your MCP client (e.g., Claude Desktop, Cursor, ElizaOS) by adding the URL https://email-deliverability.api.klymax402.com/mcp to mcpServers. Then invoke the tool email_audit_deliverability with the required domain parameter (e.g., example.com). You can also call the HTTP endpoint directly with a curl command; any x402‑aware client handles the payment challenge automatically.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"email deliverability x402": {
"email-deliverability": {
"url": "https://email-deliverability-production.up.railway.app/mcp",
"transport": "sse"
}
}
}
}McpServers
{
"email-deliverability": {
"url": "https://email-deliverability-production.up.railway.app/mcp",
"transport": "sse"
}
}Email Deliverability Audit API
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
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