# Business Day Calendars

> Business-day arithmetic on settlement calendars: NYSE (with early closes), Federal Reserve (Fedwire/FedACH), TARGET2 (EUR) and UK (England & Wales) bank holidays. Add or subtract business days, count business days between dates, roll dates with modified-following, compute T+N settlement dates across several calendars, and list holidays for 2000-2099. Made by Quietwork Labs.

- MCP (Streamable HTTP): https://business-days.quietworklabs.workers.dev/mcp (tools: is_business_day, add_business_days, settlement_date, business_days_between, adjust_date, list_holidays; 5 free calls/day per tool, then x402 USDC on Base)
- HTTP API (x402 v2, pay per call, no account):
  - GET https://business-days.quietworklabs.workers.dev/v1/is-business-day ($0.001): Is a date a business day on the given calendars
  - GET https://business-days.quietworklabs.workers.dev/v1/add-business-days ($0.001): Add or subtract N business days
  - GET https://business-days.quietworklabs.workers.dev/v1/settlement-date ($0.001): T+N settlement date for a trade date
  - GET https://business-days.quietworklabs.workers.dev/v1/business-days-between ($0.001): Count business days between two dates
  - GET https://business-days.quietworklabs.workers.dev/v1/adjust ($0.001): Roll a date to a business day (modified following etc.)
  - GET https://business-days.quietworklabs.workers.dev/v1/holidays ($0.001): Holidays (and NYSE early closes) for a calendar and year
- OpenAPI: https://business-days.quietworklabs.workers.dev/openapi.json
- x402 manifest: https://business-days.quietworklabs.workers.dev/.well-known/x402
- Docs: https://business-days.quietworklabs.workers.dev/docs · Guides: https://business-days.quietworklabs.workers.dev/guides
- About: https://business-days.quietworklabs.workers.dev/about · Terms: https://business-days.quietworklabs.workers.dev/terms
- How to pay (x402 USDC on Base, step by step + TypeScript): https://business-days.quietworklabs.workers.dev/how-to-pay