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Just Domain. MCP Server

by justdomain Your server? Claim it
answering

Just Domain. is answering right now. Last checked 3 min ago. It exposes 3 tools. Last commit 1 Nov 2026.

Check a domain name, both prices and whether it can transfer in. You register it on justdomain.ai.

Uptime history 91 days of history · worst day 95%
91 days agonow
100.0%
Uptime 24h
91 of 91 checks
3
Tools
read from the server
417 ms
Response time
average over 24h
0
Stars
last commit 1 Nov 2026

What changed 21

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 13 August 2026. No other catalogue keeps this.

31 Oct a tool description was rewritten search_domains
31 Oct a tool changed version
29 Oct a tool description was rewritten check_trademark
29 Oct a tool changed version
26 Oct a tool disappeared search_trademarks
26 Oct a tool changed version
25 Oct 2 tools appeared check_trademark, search_trademarks
25 Oct a tool description was rewritten search_domains
25 Oct a tool changed version
4 Oct a tool changed version
and 10 more, back to 13 August 2026

Tools have disappeared from this server

A tool that vanishes takes a piece of your agent with it, and the change arrives silently. Watch this server and every such change lands in your inbox.

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Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

run in your terminal
claude mcp add just-domain --transport http https://mcp.justdomain.ai/
Settings → Connectors → Add custom connector, then paste this address
https://mcp.justdomain.ai/
~/.codex/config.toml
[mcp_servers.just-domain]
url = "https://mcp.justdomain.ai/"
.cursor/mcp.json
{
  "mcpServers": {
    "just-domain": {
      "url": "https://mcp.justdomain.ai/"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "just-domain": {
      "type": "http",
      "url": "https://mcp.justdomain.ai/"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

domain
check_domain_transfer
Read-only transfer precheck for ONE domain the user already owns at another registrar: could it move to Just Domain, what is stopping it, what would it cost, and does its DNS survive the move. Nothing is ordered, charged, unlocked, or changed. The answer is built from two public sources only, the registry's own RDAP record and our registrar's price list, so it is safe to call without authentication and it reads nothing about the user's account. Read `blockers` before you say anything: an EMPTY list is the only thing that means the domain is ready to move. Every entry carries a plain `detail` sentence you can show as-is, and a `code` you do not recognise must still be reported through its `detail` rather than dropped. `source.rdap: false` means the registry did not answer, so nothing about the domain was established: say that, and never call it ready. `price` is the TOTAL for one full transfer term, not a per-year rate. A .ai transfer adds and charges TWO years because its registry works in two-year units. Do not divide or multiply the amount by a number of years, and do not label it per year; quote `term_note` beside it. `expected_new_expiry` is a projection (the registry's current expiry plus the term), not a date any registry has confirmed, so present it as expected. Moving a domain IN is self-service: the owner checks it and pays at https://justdomain.ai/transfer, pasting the authorization code there, and a transfer that does not complete is refunded in full. This tool tells the user whether the domain is eligible to move and what one full term would cost; hand over `transfer_url`, which opens that page for this domain in the owner's browser. Nothing is paid or ordered inside the chat. Moving a domain OUT of Just Domain IS self-service, and that means a human owner signed in on justdomain.ai in a browser, switching the transfer lock off and issuing the code from their own account. It does not mean you can do it. This tool does not return, accept, or hint at an authorization (EPP) code, and there is no agent path to unlocking a domain or to having a code issued, here or through any other Just Domain surface. An auth code is a bearer credential for the domain and a chat transcript is not a place to put one. Do not ask the user for a code, do not offer to hold or relay one, and never claim you can unlock or move the domain yourself.
domains
search_domains
Use this when the user asks whether a domain name is available or what it costs to register: call it directly with the names, with no account and no confirmation needed. That includes a name for a site the user built, or is building, with ChatGPT Sites. Read-only availability and pricing lookup for domain names. No purchase or order is created by this tool; it only returns information. Preferred input: `domains`, 1 to 200 fully-qualified names (e.g. ['acme.com', 'acme.io']); results cover exactly those domains, with no suggestions or expansion. Fallback input: `query`, free text (one or more names, comma- or space-separated); names given without a TLD are expanded to popular TLDs (com/io/ai/co/net). Each result includes whether the domain is available, whether it is a premium name, the registration price and the renewal price. Both prices are totals for one full registration term of that ending, not per-year rates: one year on most endings, but two years on .ai, whose registry mandates a two-year term. Do not divide or multiply a returned price by a number of years. Available non-premium results also carry a `checkout_url` the user can open in a browser to register the domain on justdomain.ai if they choose to. Premium names cannot be registered through Just Domain yet and carry no `checkout_url`.
trademark
check_trademark
Read-only trademark check for ONE proposed name, answered by Open Trademarks (opentrademarks.org) from the US, EU and Israeli trademark registers. Nothing is filed, reserved, watched or paid for. Optional `goods` (free text, mapped to Nice classes), `classes` (Nice classes 1 to 45) and `registers` (a subset of `us`, `eu`, `il`; all three by default) narrow the check. Read `verdict` first. `exact_live_mark` and `similar_live_marks` name the marks behind them in `conflicts`, each with its register, number and how it matched. `no_live_match` means no live mark matched in the registers that were read: a positive signal, not clearance. `not_checked` means no register in this check has been read yet, so it is NOT a verdict: do not call the name clear or taken on it. `registers` gives each register's read date, and a register with no `loaded_at` was not checked at all. Never tell a user a name is clear unless it was checked during this conversation and every register in the answer was read today or yesterday. Quote `notice` as written: a register search is not legal advice. Use it when the user is choosing or vetting a name for a brand, product or business. It checks trademarks only: for whether a domain is available or what it costs, use `search_domains`; for moving a domain the user already owns at another registrar to Just Domain, use `check_domain_transfer`.

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

search_trademarks
removed 26 Oct 2026

Endpoints

URLTransportStateLatencyChecked
https://mcp.justdomain.ai/ streamable-http answering 422 ms 3 min ago

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same job, measured the same way
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F
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Check whether a name is free on package registries, app stores, agent directories and domains.

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Check whether AI agents can discover, validate, and trust your domain's services.

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D
Domaincheck
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Domain availability and pricing, transfer prechecks, US/EU/IL trademark register checks.

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Just Domain. — questions

Answers built from our own checks of this server.

What can Just Domain. do?
It exposes 3 tools, read directly from the server on our last check. Among them: check_domain_transfer, check_trademark, search_domains. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Just Domain. working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 417 ms. The bar chart above shows every period we have measured.
Did Just Domain. ever remove tools?
Yes. search_trademarks is no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.
How do I connect Just Domain.?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Just Domain. need an API key?
No. Just Domain. completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Just Domain.?
It answers our handshake in 417 ms on average, which is faster than 31% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Just Domain. open source?
The code is open source: it is published under the MIT licence, written in Python and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at mcp.justdomain.ai, which runs on its operator's own terms.