US Business Calendar MCP Server

by donniertf-hub Your server? Claim it

answering

US Business Calendar MCP is answering right now. Last checked 2 min ago. It exposes 9 tools. Last commit 14 Oct 2026.

US federal holidays, business-day maths, invoice due dates and IRS deadlines.

Uptime history 62 hours of history

62 hours agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

129 ms

Response time

average over 24h

Stars

last commit 14 Oct 2026

Nothing serious here today

Today is the operative word: we check US Business Calendar MCP every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add us-business-calendar-mcp --transport http https://us-business-calendar-mcp.donniertf.workers.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://us-business-calendar-mcp.donniertf.workers.dev/mcp

~/.codex/config.toml

[mcp_servers.us-business-calendar-mcp]
url = "https://us-business-calendar-mcp.donniertf.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "us-business-calendar-mcp": {
      "url": "https://us-business-calendar-mcp.donniertf.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "us-business-calendar-mcp": {
      "type": "http",
      "url": "https://us-business-calendar-mcp.donniertf.workers.dev/mcp"
    }
  }
}

Available tools 9

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

domain

domain_age

FREE. Domain trust quick check: registration date, age in days, registrar, expiry and risk flags from RDAP. Accepts a domain or URL.

domain_trust_report

Full domain/URL trust report: RDAP registration, registrar, status, nameservers, plus active TLS certificates and issuers from crt.sh, with risk flags.

business

business_days

PRO. Count US business days between two dates (excludes weekends and federal holidays).

cert

cert_history

Active TLS certificates for a domain from Certificate Transparency logs (crt.sh): issuers, names, validity dates.

due

due_date

PRO. Due date after N business days or N calendar days (rolled to next business day) — Net 30/60, ACH settlement, contract notice periods.

email_domain_check

Email/domain deliverability check: MX records, SPF and DMARC policy for a domain or email address (DNS over HTTPS).

iban

iban_validate

FREE. Validate an IBAN offline: country, length and ISO 13616 mod-97 checksum, plus bank code and formatted IBAN. No outside source.

irs

irs_deadlines

PRO. Upcoming IRS filing and payment deadlines for the next N months (individual, payroll, corporate), adjusted for weekends/holidays; optional fiscal_year_end.

next_holidays

FREE. Next 3 US federal holidays (with observed dates) and whether today is a business day.

Endpoints

URL	Transport	State	Latency	Checked
https://us-business-calendar-mcp.donniertf.workers.dev/mcp	streamable-http	answering	145 ms	2 min ago

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US Business Calendar MCP — questions

Answers built from our own checks of this server.

What can US Business Calendar MCP do?

It exposes 9 tools, read directly from the server on our last check. Among them: business_days, cert_history, domain_age, domain_trust_report, due_date, email_domain_check and 3 more. 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 US Business Calendar MCP working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 129 ms. The bar chart above shows every period we have measured.

How do I connect US Business Calendar MCP?

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 US Business Calendar MCP need an API key?

No. US Business Calendar MCP completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 9 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is US Business Calendar MCP?

It answers our handshake in 129 ms on average, which is faster than 86% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is US Business Calendar MCP open source?

We cannot say either way: 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.