Use DomainDNA MCP with Gemini CLI

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, or add the server to settings.json under "mcpServers".
Start Gemini CLI and run /mcp to list the server and its tools.
Ask a question the tools can answer.

Run:

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

Or add it to settings.json yourself::

{
  "mcpServers": {
    "domaindna-api": {
      "httpUrl": "https://domaindna-api.cybermaxtools.com/mcp?via=use-with-gemini-cli"
    }
  }
}

With a paid key:

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

Use the project file only if it is not committed with the key in it.

Where it goes:

~/.gemini/settings.json (user)
.gemini/settings.json (project, the default for the add command)

Config format checked 2026-10-09 against Gemini CLI'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

Use "httpUrl" for Streamable HTTP; "url" is for the older SSE transport.
The docs note that for unpaid-tier and Google One users, Gemini CLI was replaced by Antigravity CLI on 18 June 2026.
The free tier has a daily limit (see the pricing line above); a paid key raises it.

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