Startup Name Check in Cursor
Is that name's domain taken?. The MCP server is https://names.openkrill.app/mcp. No key. The steps below are only for Cursor. A call to check_domain_availability was checked against that server on 2026-10-01.
What this server answers
Check whether the domain for a startup, product or business name is already registered before you fall in love with it.
Ask "is acme.com available?", "check if this startup name is taken" or "find an available .com for my bakery name".
Startup Name Check turns a name into a domain label, then asks Cloudflare Registrar's domain-check API whether that domain can be registered and what it costs. When that API is not configured, or does not cover the ending, it asks the registry's public RDAP service instead.
It checks up to five names or domains at a time across .com, .net, .org, .ai, .app and .dev by default, or the endings you choose.
For a taken domain it shows the registration, expiry and last-change dates when the registry publishes them. It never returns who owns it or any contact details.
When Cloudflare Registrar answers for an available domain, the answer includes the registration and renewal cost. That figure is not a charge and does not reserve the name.
Results are indicative: they show the status at that moment and do not reserve a name. Premium or reserved names can be unavailable or cost more.
Trademarks are not searched, so run a trademark check before you commit to a name.
It stores nothing about you: answers are cached for up to five minutes, and the only lasting record is a daily count of calls per tool.
What it can do
- Checks whether a name's domain is registered in .com, .net, .org, .ai, .app and .dev
- Checks a full domain such as acme.com on its own
- Compares up to five candidate names in one answer
- Shows registration and expiry dates for domains that are taken, when the registry publishes them
- Shows the registration and renewal cost when Cloudflare Registrar returns one
- Never returns owner or contact details
Tools
check_domain_availability, Check name and domain availability. Use this when the user asks whether a domain or startup name is available or taken, for example "is acme.com available", "check if this startup name is taken" or "find an available .com for my bakery name". Pass up to 5 names or full domains. Names are checked across .com, .net, .org, .ai, .app and .dev unless tlds says otherwise. Returns, for each domain, available, registered (with registration, expiry and last-change dates when published), unsupported or unavailable, plus source. An available domain includes registrationCost and renewalCost when Cloudflare Registrar returns them. The result is indicative, not a reservation or a charge; it never includes owner details and does not check trademarks.
Add Startup Name Check in Cursor
Cursor reads MCP servers from mcp.json. A project file at .cursor/mcp.json applies to that project. A user file at ~/.cursor/mcp.json applies everywhere. These steps were checked against the Cursor MCP docs on 2026-10-01. Streamable HTTP is the transport: a url, not a shell command.
Create or edit the file so it contains this server. Merge it with servers you already have. Do not replace the whole file if other servers are listed.
{
"mcpServers": {
"names": {
"url": "https://names.openkrill.app/mcp"
}
}
}No headers and no auth block. Those are for servers that require a token or a pre-registered OAuth client. Startup Name Check answers without either. Saving the file is the install. Open Cursor Settings, then MCP, and confirm Startup Name Check is enabled. If it stays disconnected, reload the window. You should see check_domain_availability.
In Agent chat, ask: Is acme.com available? Cursor calls the tool over streamable HTTP and shows the arguments before it runs them, depending on your run mode. Approve the call the first time and read the result. The server is public and read-only. It does not see your repository unless the model puts repository text into the arguments, so do not paste secrets into the question.
A one-click Marketplace install does not exist for this server. The JSON above is the whole setup. Team admins can distribute the same url through a team marketplace, but that is an admin step, not something this page can do for you. OAuth redirect URLs in the Cursor docs matter only for servers that require sign-in. Skip them here.
A call checked on 2026-10-01
example.com is a reserved public name, so the check is repeatable and does not probe a private brand. The request below was posted to https://names.openkrill.app/mcp as tools/call. HTTP 200. Source: the Startup Name Check server, read 2026-10-01.
{
"method": "tools/call",
"params": {
"name": "check_domain_availability",
"arguments": {
"names": [
"example.com"
]
}
}
}- notice. Indicative only: this is the registry's status right now, it does not reserve anything, and premium or reserved names can be taken or cost more at a registrar. Trademarks are not checked.
- names. 1 returned
Repeat the call yourself if you need a newer reading. Cached answers expire. A rate limit is not a result: wait and try again. Nothing in the call is a ranking, a filing, or advice.