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Business Day Calendars – Count Business Days Between Dates
x402
Business Day Calendars – Count Business Days Between Dates 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).
Returns the number of business days between two dates for one or more settlement calendars (NYSE, FED, TARGET2, UK), including a list of holidays in the range.
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
A JSON object containing the start and end dates, the list of calendars used, the inclusive flag, the total count of business days in the range, and an array of holiday dates (YYYY-MM-DD) that fell within the range.
Example use cases
T+2 settlement window sizing
“How many NYSE business days are there between March 3, 2026 and March 31, 2026? I need to know how many settlement cycles fit in that window — don't include the start date.”
ACH payroll planning
“Count the number of Federal Reserve (FED) business days between April 1, 2026 and June 30, 2026, not counting April 1st itself. I need to plan payroll runs for the quarter.”
EUR TARGET2 deal deadline check
“How many TARGET2 business days are between May 1, 2026 and May 31, 2026? I want to know how many EUR settlement days I have in May, including the 1st.”
Technical details
Endpoint
GEThttps://business-days.quietworklabs.workers.dev/v1/business-days-between?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to count the exact number of business days between two dates according to a specific financial settlement calendar (NYSE, FED/ACH, TARGET2, or UK). Prefer it over generic weekday counters when holiday accuracy for regulated markets matters — e.g. for T+N settlement, payroll scheduling, or regulatory deadline calculations. Covers 2000–2099.
Side effects
- Missing required start or end date parameters returns a 400 error
- Invalid date format (non-YYYY-MM-DD) causes a parse error
- Unrecognized calendar alias returns an error or defaults to FED
- End date before start date may return 0 or an error
- Payment failure (x402) blocks access if USDC not provided
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"end": "2026-12-31",
"start": "2026-01-01",
"calendars": [
{
"id": "FED",
"name": "Federal Reserve (Fedwire/FedACH)"
}
],
"inclusive": false,
"businessDays": 251,
"holidaysInRange": [
"2026-01-19",
"2026-02-16"
]
}
}Tags
x402
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