US Business Calendar MCP

io.github.donniertf-hub/us-business-calendar-mcpVersion 1.0.0

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

Status

Responds106 msNov 14, 2026, 14:50 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:50 UTC
Latency: 106 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://us-business-calendar-mcp.donniertf.workers.dev/mcpResponds106 msNov 14, 2026, 14:50 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: us-business-calendar-mcp
Remote MCP server URL: https://us-business-calendar-mcp.donniertf.workers.dev/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"us-business-calendar-mcp","type":"http","url":"https://us-business-calendar-mcp.donniertf.workers.dev/mcp"}'

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Tools

9 tools

Tools of US Business Calendar MCP
	Description		Read-only	Idempotent	Open world
`business_days`PRO. Count US business days between two dates (excludes weekends and federal holidays).	PRO. Count US business days between two dates (excludes weekends and federal holidays).	Not declared	Not declared	Not declared	Not declared
`cert_history`Active TLS certificates for a domain from Certificate Transparency logs (crt.sh): issuers, names, validity dates.	Active TLS certificates for a domain from Certificate Transparency logs (crt.sh): issuers, names, validity dates.	Not declared	Not declared	Not declared	Not declared
`domain_age`FREE. Domain trust quick check: registration date, age in days, registrar, expiry and risk flags from RDAP. Accepts a domain or URL.	FREE. Domain trust quick check: registration date, age in days, registrar, expiry and risk flags from RDAP. Accepts a domain or URL.	Not declared	Not declared	Not declared	Not declared
`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.	Full domain/URL trust report: RDAP registration, registrar, status, nameservers, plus active TLS certificates and issuers from crt.sh, with risk flags.	Not declared	Not declared	Not declared	Not declared
`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.	PRO. Due date after N business days or N calendar days (rolled to next business day) — Net 30/60, ACH settlement, contract notice periods.	Not declared	Not declared	Not declared	Not declared
`email_domain_check`Email/domain deliverability check: MX records, SPF and DMARC policy for a domain or email address (DNS over HTTPS).	Email/domain deliverability check: MX records, SPF and DMARC policy for a domain or email address (DNS over HTTPS).	Not declared	Not declared	Not declared	Not declared
`iban_validate`FREE. Validate an IBAN offline: country, length and ISO 13616 mod-97 checksum, plus bank code and formatted IBAN. No outside source.	FREE. Validate an IBAN offline: country, length and ISO 13616 mod-97 checksum, plus bank code and formatted IBAN. No outside source.	Not declared	Not declared	Not declared	Not declared
`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.	PRO. Upcoming IRS filing and payment deadlines for the next N months (individual, payroll, corporate), adjusted for weekends/holidays; optional fiscal_year_end.	Not declared	Not declared	Not declared	Not declared
`next_holidays`FREE. Next 3 US federal holidays (with observed dates) and whether today is a business day.	FREE. Next 3 US federal holidays (with observed dates) and whether today is a business day.	Not declared	Not declared	Not declared	Not declared

Details

Registry status: Active
Published: Oct 29, 2026
Updated: Oct 29, 2026
Website: https://us-business-calendar-mcp.donniertf.workers.dev/⁠ (opens in a new tab)
Repository: https://github.com/donniertf-hub/uk-mcp-fleet⁠ (opens in a new tab)
Categories (suggested): CommunicationSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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