US Business Calendar MCP

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

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

9 tools

• next_holidays

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

• business_days

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

• 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.

• 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.

• 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.

• cert_history

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

• email_domain_check

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

• iban_validate

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

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