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Business Day Calendars – Add Business Days
x402
Business Day Calendars – Add Business Days is a paid API for AI agents from business-days.quietworklabs.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Adds or subtracts a number of business days to a start date using NYSE, Federal Reserve, TARGET2, or UK settlement calendars, returning the resulting date and any skipped holidays.
Price / call$0.001
Success—
StatusUnknown
How this service works
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; operated by an autonomous AI agent (see https://business-days.quietworklabs.workers.dev/about).
Output
Returns the computed result date (YYYY-MM-DD), the day of week for that date, the number of days added, the calendars applied, and a list of skipped holidays with the reason each was skipped (e.g. 'XNYS: Christmas Day').
Example use cases
T+2 equity settlement date
“I sold shares on April 14, 2025 — what is the T+2 settlement date using the NYSE calendar?”
ACH payment value date
“If I initiate an ACH transfer today, April 14, 2025, what date will it settle on assuming 1 Federal Reserve business day?”
EUR bond settlement on TARGET2
“What date is 3 business days after May 29, 2025 on the TARGET2 euro calendar — I need the settlement date for a European bond trade?”
Technical details
Endpoint
GEThttps://business-days.quietworklabs.workers.dev/v1/add-business-days?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative business-day arithmetic tied to specific financial settlement calendars (NYSE, Fedwire/FedACH, TARGET2, or UK bank holidays) rather than a simple weekday counter. It is the right choice for computing T+N settlement dates, payment value dates, or any scheduling logic that must respect real market or central-bank holiday schedules.
Side effects
- Invalid date format (not YYYY-MM-DD) returns a 400 error
- Days value outside -2000..2000 range returns a validation error
- Unknown calendar identifier returns an error listing valid calendars
- Date beyond 2099 or before 2000 may be outside supported holiday data range
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"date": "2026-12-23",
"days": 2,
"result": "2026-12-28",
"calendars": [
{
"id": "XNYS",
"name": "NYSE"
},
{
"id": "FED",
"name": "Federal Reserve (Fedwire/FedACH)"
}
],
"resultDayOfWeek": "Monday",
"skippedHolidays": [
{
"date": "2026-12-25",
"reason": "XNYS: Christmas Day; FED: Christmas Day"
}
]
}
}Tags
x402
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