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Duo Data Utilities – Business Day Arithmetic
x402
Duo Data Utilities – Business Day Arithmetic is a paid API for AI agents from api.duoleads.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-02).
Add or subtract N working days from a date, or count working days between two dates, using a caller-supplied weekend mask and holiday list.
Price / call$0.05
Success—
StatusUnknown
How this service works
Business-day arithmetic with a caller-supplied calendar: add or subtract N working days from a date, or count the working days between two dates. The weekend is a weekday mask (Friday-Saturday and Sunday-only weeks work) and holidays are an explicit date list, so nothing depends on a stale holiday table. Returns the result date, the day count and the skipped dates with reasons. The skipped list is capped at 1,000 entries (skipped_truncated flags it); skipped_total is always exact.
Output
A JSON object containing: `result` (the computed date as YYYY-MM-DD when op=add), `days` (the business day count when op=count), `from` (the start date), `skipped` array listing each skipped date with its weekday name and reason (holiday or weekend), `skipped_total` count, `skipped_truncated` boolean, and `calendar_days_spanned`. Also includes a `meta` block with `request_id`, `computed_at`, `price_usd`, and `deterministic: true`.
Example use cases
Contract notice period deadline
“Our contract requires 30 business days notice before termination. If we send notice today, March 3 2025, what date does the 30-day period end? Skip Saturdays and Sundays, and treat May 26 and July 4 as holidays.”
SLA response window count
“Count how many business days there are between January 15 2025 and February 28 2025 — standard Monday-to-Friday week, with January 20 and February 17 as public holidays. I need the exact working-day count for our SLA report.”
Middle-East work week delivery date
“Our supplier operates a Sunday–Thursday work week, so Friday and Saturday are their weekend. If an order ships on Wednesday April 2 2025, when does it arrive after 7 business days? Also flag April 18 as a regional holiday.”
Technical details
Endpoint
GEThttps://api.duoleads.com/v1/time/business-days?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic business-day arithmetic with a fully caller-controlled calendar — no reliance on a server-side holiday table that could go stale. It is ideal when the weekend definition is non-standard (e.g. Fri-Sat or Sun-only) or when you must supply your own explicit holiday list. Prefer it over generic date libraries when you need the skipped-dates audit trail (with per-day reasons) for compliance, SLA documentation, or contract traceability.
Side effects
- Missing required `from` parameter returns a 400 error
- Missing `days` when op=add or missing `to` when op=count returns a 400 validation error
- Invalid date format (not YYYY-MM-DD) returns a 400 parse error
- Invalid weekend mask value returns a 400 error
- Days value outside -3650 to 3650 range returns a 400 error
- Holiday string exceeding 2048 characters returns a 400 error
- Payment not provided or insufficient returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"days": 5,
"from": "2026-12-24",
"result": "2027-01-04",
"skipped": [
{
"date": "2026-12-25",
"reason": "holiday",
"weekday": "friday"
},
{
"date": "2026-12-26",
"reason": "weekend",
"weekday": "saturday"
},
{
"date": "2026-12-27",
"reason": "weekend",
"weekday": "sunday"
},
{
"date": "2027-01-01",
"reason": "holiday",
"weekday": "friday"
},
{
"date": "2027-01-02",
"reason": "weekend",
"weekday": "saturday"
},
{
"date": "2027-01-03",
"reason": "weekend",
"weekday": "sunday"
}
],
"skipped_total": 6,
"skipped_truncated": false,
"calendar_days_spanned": 11
},
"meta": {
"price_usd": "0.05",
"disclaimer": "Factual output of a deterministic computation over public data. Provided as is, with no warranty of accuracy, completeness or availability. Not investment, financial, legal, tax, medical or any other professional advice, and not a recommendation. Verify before relying on it. Terms: https://api.duoleads.com/terms",
"request_id": "01K6B7Q4ZC8H3F2M9WXR5TYN0D",
"computed_at": "2026-09-28T12:00:00.000Z",
"deterministic": true
},
"route": "/v1/time/business-days",
"version": "1.0.0"
}
}Tags
x402
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