Use DomainDNA MCP with Claude Code

Tech stack, email security (SPF, DMARC, MX provider) and domain age API + MCP. 25 free domains/day.

Remote MCP server (Streamable HTTP), nothing to install. Free: 25 free domains/day · Paid: $5 pack; $19/mo

Set it up

Run the command in your terminal (add --scope user to use it in every project, or --scope project to write .mcp.json).
Start Claude Code and type /mcp to see the server and its tools.
Ask a question the tools can answer; Claude Code asks permission before each tool call unless you allow it.

Run:

claude mcp add --transport http domaindna-api 'https://domaindna-api.cybermaxtools.com/mcp?via=use-with-claude-code'

Or share it with your team in .mcp.json (project scope)::

{
  "mcpServers": {
    "domaindna-api": {
      "type": "http",
      "url": "https://domaindna-api.cybermaxtools.com/mcp?via=use-with-claude-code"
    }
  }
}

With a paid key:

claude mcp add --transport http domaindna-api 'https://domaindna-api.cybermaxtools.com/mcp?via=use-with-claude-code' \
  --header "x-api-key: YOUR_KEY"

In .mcp.json, ${CYBERMAX_API_KEY} is read from the environment so the key is not committed.

Where it goes:

stored by the CLI: local scope (default, you in this project), project scope (.mcp.json, shared), user scope (you, every project)

Config format checked 2026-10-09 against Claude Code's MCP documentation.

Tools you get

Endpoint checked 2026-10-09: https://domaindna-api.cybermaxtools.com/mcp answered an MCP initialize (protocol 2025-06-18) and tools/list with 4 tools, all marked read-only. No key was used and no tool was called.

Tool	What it does	Required inputs
`domain_report`	Tech stack (with evidence), email provider, SPF, DMARC, DNS, RDAP registration (age, registrar, expiry), security headers and site files for one domain, URL or email.	`domain`
`email_security`	MX provider, SPF record and all qualifier, DMARC policy, pct and rua, A/AAAA/NS and TXT verifications for 1-5 domains.	`domains`
`tech_stack`	Technologies (CMS, e-commerce, frameworks, analytics, tag managers, CDN, chat...) with the evidence for each, plus security headers, for 1-3 websites.	`domains`
`domain_registration`	RDAP registration (registrar, created, updated, expires, age in days, status) for 1-10 domains.	`domains`

Test the endpoint from a terminal

This lists the tools without a key and without calling any of them:

curl -s https://domaindna-api.cybermaxtools.com/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

If it does not work

If a project-scoped server does not load, Claude Code asks you to approve servers from .mcp.json the first time.
The free tier has a daily limit (see the pricing line above); a paid key raises it.

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