Domain Availability MCP Server

Check whether domain names are available to register — from Claude, Cursor, Codex, VS Code or any MCP client.

Every answer comes from a live registry lookup (RDAP / WHOIS), with first-year and renewal prices and a link to register.

Hosted by Namechan.

Tools

All tools are read-only. unknown means the registry did not answer in time — it is never reported as available. A price with basis: "list" is the extension's standard rate (the registrar did not quote this exact name in time), so a premium name could cost more; basis: "quote" is the registrar's price for that name.

Related MCP server: domain-mcp

Free, no key needed

Every tool works without an account or API key, within a per-address limit (the same as using namechan.com without signing in). For more, sign in at https://namechan.com/api-keys and create a free key (it starts with nck_): calls with it count against your account instead, with a larger allowance. get_usage shows what is left either way.

Connect

Remote (recommended)

The server runs at https://namechan.com/mcp (Streamable HTTP). With a key, add the header Authorization: Bearer <key>; without one, leave it out.

Claude Code

claude mcp add -s user --transport http domain-availability https://namechan.com/mcp

With a key — also the way to add one to an existing setup, since add refuses a name that is already there:

claude mcp remove -s user domain-availability 2>/dev/null; \
claude mcp add -s user --transport http domain-availability https://namechan.com/mcp \
  --header "Authorization: Bearer nck_YOUR_API_KEY"

Cursor — ~/.cursor/mcp.json

{
  "mcpServers": {
    "domain-availability": {
      "url": "https://namechan.com/mcp"
    }
  }
}

Add "headers": { "Authorization": "Bearer nck_YOUR_API_KEY" } next to url to use a key.

VS Code — .vscode/mcp.json

{
  "servers": {
    "domain-availability": {
      "type": "http",
      "url": "https://namechan.com/mcp"
    }
  }
}

Local (stdio)

For clients that only start local servers, this package bridges stdio to the remote endpoint. It has no dependencies and needs Node.js 18+.

Claude Desktop — claude_desktop_config.json

{
  "mcpServers": {
    "domain-availability": {
      "command": "npx",
      "args": ["-y", "domain-availability-mcp"]
    }
  }
}

Codex — ~/.codex/config.toml

[mcp_servers.domain-availability]
command = "npx"
args = ["-y", "domain-availability-mcp"]
# optional: env = { NAMECHAN_API_KEY = "nck_YOUR_API_KEY" }

With a key, the package reads it from NAMECHAN_API_KEY (add "env": { "NAMECHAN_API_KEY": "nck_…" } to the config above), or from ~/.config/namechan/api-key (keep it chmod 600) when the variable is not set.

Example prompts

• "Find a short name for a budgeting app and check which .com and .ai domains are free."

• "Which of these are available: brightnest.com, brightnest.io, getbrightnest.com?"

• "When does example.com expire?"

HTTP API

The same lookups are available without MCP:

curl "https://namechan.com/api/v1/check?domains=acme.com,acme.io"
# add  -H "Authorization: Bearer nck_YOUR_API_KEY"  to use a key

See also the Namechan agent skill, which adds a naming workflow on top of these lookups.

License

MIT