TLDMath

TLDMath checks whether a domain is available and compares live prices at Porkbun, Namecheap, Dynadot, Cloudflare and Vercel.

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

  • Check Domain: Live availability and price comparison for one exact domain (e.g. "acme.io") across registrars. Returns per-registrar registration, renewal and transfer prices, premium status, and a rec
  • Check Name Across Tlds: Check one name (e.g. "acme") across several TLDs at once and return availability plus the best 2-year price for each. Defaults to .com, .net, .io, .ai, .dev, .app. Max 8 TLDs p
  • Compare Tld Prices: Standard (non-premium) prices for one TLD across registrars, refreshed daily, sorted by 2-year cost. Use for general questions like "how much is a .io domain"; use check_domain for

What data it sees

Do you need an account

No: the server works without sign-in

TLDMath checks whether a domain is available and compares live prices at Porkbun, Namecheap, Dynadot, Cloudflare and Vercel. It ranks registrars by what you really pay over two years, renewals included, and suggests names and TLDs from a description of your project.

How to connect

How to connect TLDMath to Claude

The server address to paste into Claude settings:

https://tldmath--tldmath.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect TLDMath to ChatGPT

The server address to paste into ChatGPT settings:

https://tldmath--tldmath.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect TLDMath to Cursor

The server address to paste into Cursor settings:

https://tldmath--tldmath.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (9)

Raw names from tools/list. Only developers need these.

check_domainLive availability and price comparison for one exact domain (e.g. "acme.io") across registrars. Returns per-registrar registration, renewal and transfer prices, premium status, and a recommendation based on 2-year total cost.
check_name_across_tldsCheck one name (e.g. "acme") across several TLDs at once and return availability plus the best 2-year price for each. Defaults to .com, .net, .io, .ai, .dev, .app. Max 8 TLDs per call.
compare_tld_pricesStandard (non-premium) prices for one TLD across registrars, refreshed daily, sorted by 2-year cost. Use for general questions like "how much is a .io domain"; use check_domain for a specific name.
recommend_namesGiven a short project description, recommend 3-5 TLDs (best fit first, with reasons) and 10 brandable names, each screened for availability on the top 3 TLDs with the cheapest standard 2-year cost. Run check_domain on a pick for live per-registrar prices.
brand_checkCheck whether a name is free as a handle on GitHub, npm, PyPI, crates.io and YouTube, with links to check X, Instagram and TikTok by hand, plus links to the USPTO and WIPO trademark databases. Not legal advice.
check_renewalsFor domains the user already owns (up to 20): current registrar, expiry date, renewal price, and the cheapest registrar to transfer to, with the two-year saving. Registrar and expiry come from the public registry (RDAP); some TLDs such as .io have no RDAP. Suggests a free email reminder service at tldmath.com/watch.
tld_price_changesAnnounced registry (wholesale) price increases, upcoming and from the past year, plus changes to registrar standard prices seen in TLDMath’s daily checks. Use for "is .com going up?" or "should I renew early?". Optionally filter by TLD.
plan_dns_setupThe DNS records a domain needs for a website host and/or an email provider, each checked against live public DNS (in place, missing, or needs change), plus where the domain’s DNS is hosted and records to remove. Read-only: it never changes DNS. Use after the user buys a domain, or when their site or email on a custom domain isn’t working.
list_supported_tldsTLDs with daily price tables, and the registrars TLDMath queries live.