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Business Day & Deadline API – Add/Subtract Business Days
x402
Business Day & Deadline API – Add/Subtract Business Days is a paid API for AI agents from businessdayapi.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Calculates a future or past business date by adding or subtracting a specified number of business days from a start date, accounting for public holidays and weekend rules across ~200 countries and their subdivisions.
Price / call$0.001
Success—
StatusUnknown
How this service works
Verified, always-current business-day arithmetic for ~200 countries incl. subdivisions (German Bundeslaender, US states) and correct per-country weekend rules (e.g. Fri/Sat in Egypt). Informational only — verify legally binding deadlines with the competent authority. Not legal advice.
Output
A JSON object containing the computed result date (YYYY-MM-DD), the original start date and days-requested, the country code used, a list of skipped dates with their reason (holiday or weekend) and holiday name where applicable, the data source (nager.date), and a verifiedAt timestamp indicating when the holiday data was last confirmed.
Example use cases
Contract notice period deadline
“Our contract says we need to give 14 business days' written notice before terminating. If we send the notice today, May 15 2025, what's the earliest termination date for a UK-based counterparty?”
Invoice payment window calculation
“We issue an invoice today, June 3 2025, with net-30 business days payment terms for a client in Japan. What calendar date is the payment due, skipping Japanese public holidays?”
US state-specific legal filing deadline
“A California court order was issued on March 10 2026 and requires a response within 20 business days under California rules. What is the response deadline date, accounting for CA state holidays and standard Sat-Sun weekends?”
Technical details
Endpoint
GEThttps://businessdayapi.com/v1/add?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need verified, up-to-date business-day arithmetic across international jurisdictions, especially when subdivision-level accuracy (e.g. German Bundesländer, US states) or non-standard weekend rules (e.g. Friday–Saturday in Egypt) matter. It is preferable over generic date-math libraries that lack maintained holiday databases, or over building custom holiday calendars. It is informational and should not replace legal counsel for binding deadlines.
Side effects
- Missing required query parameters (start, days, country) returns a 400 error
- Invalid or unsupported ISO country code returns an error or empty holiday data
- Unsupported subdivision code may silently fall back to country-level holidays
- Negative days value (subtraction) may not be supported by all country calendars
- Holiday data may lag for newly announced public holidays; verifiedAt timestamp indicates data freshness
- Payment failure via x402 returns 402 Payment Required before computation is attempted
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"days": 3,
"start": "2026-04-01",
"source": "nager.date",
"country": "DE",
"skipped": [
{
"date": "2026-04-03",
"reason": "holiday",
"holidayName": "Karfreitag"
}
],
"resultDate": "2026-04-08",
"verifiedAt": "2026-08-17T00:00:00Z"
}
}Tags
x402
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