MCP Server

Check domain availability and live registry pricing from Claude, Cursor, or any MCP client. It's free to use, with no account and no API key.

Endpoint

https://www.orbitfour.com/mcp

Streamable HTTP, JSON-RPC 2.0, no authentication

Connect your client

Claude Code

claude mcp add --transport http orbitfour https://www.orbitfour.com/mcp

Claude (web and desktop)

Open Settings → Connectors, choose Add custom connector, and paste the endpoint URL.

Cursor

Add it to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "orbitfour": {
      "url": "https://www.orbitfour.com/mcp"
    }
  }
}

VS Code

Add it to .vscode/mcp.json in your workspace:

{
  "servers": {
    "orbitfour": {
      "type": "http",
      "url": "https://www.orbitfour.com/mcp"
    }
  }
}

Any other client: add a remote server at the endpoint URL using the Streamable HTTP transport. There's no key to configure.

Tools

check_domain

Check domain availability and price

Check availability and price (registration, renewal, transfer) for one or more domain names. Prices come from live registry checks, including premium domains. All prices are per-year; min_years in each result is the smallest number of years the registry will sell (usually 1, but e.g. .ai is 2 — multiply the per-year prices by min_years for the true minimum cost). Each result's pricing_source says where its registration price came from: "registry" is a live quote for that name, "baseline" is the extension's standard rate, and "unconfirmed" means the registry lookup did not finish — do not treat an unconfirmed price as final for a name that may be premium. pricing_sources breaks this out per action.

Parameter	Type	Description
`names` required	string[]	Domain names to check, e.g. ["example.com", "example.net"]. Max 10.
`years`	integer (1–10)	Registration term in years (default 1).

search_domains

Search for available domain names

Discover available domain names from a free-text seed (an app idea, brand, or phrase). Returns ranked, available, priced suggestions (registration, renewal, transfer) from live registry checks. All prices are per-year; min_years in each suggestion is the smallest number of years the registry will sell (usually 1, e.g. .ai is 2). Use check_domain instead when you already have exact names to look up. Each result's pricing_source says where its registration price came from: "registry" is a live quote for that name, "baseline" is the extension's standard rate, and "unconfirmed" means the registry lookup did not finish — do not treat an unconfirmed price as final for a name that may be premium. pricing_sources breaks this out per action.

Parameter	Type	Description
`query` required	string	Free-text seed, e.g. "learning studio app", a bare SLD, or a full domain.
`limit`	integer (1–25)	Target number of suggestions (default 10).
`tlds`	string[]	Optional TLDs to restrict the search to, e.g. ["com", "app", "io"].
`years`	integer (1–10)	Registration term in years (default 1).

Good to know

Prices are per year, in USD. Before you treat a price as a quote, read min_years and pricing_source; the tool descriptions above explain both.
Both tools are read-only. They never register, reserve or hold a domain.
check_domain takes up to 10 names per call.
Requests are rate-limited per IP address. Over the limit, the server answers HTTP 429 with a Retry-After header.
The tools return the same payloads as the REST endpoints /api/v1/domains/check and /api/v1/domains/search. Agents writing an integration should start with llms.txt.