# Workday Calendar API – Business Days Add

> Workday Calendar API – Business Days Add is a paid API for AI agents from workday-calendar.regnotes.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).

Returns the date that is N business days after (or before) a given start date in a specified country, skipping weekends and national holidays.

## Facts

- Endpoint: GET https://workday-calendar.regnotes.workers.dev/v1/business-days/add?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/workday-calendar-api-business-days-add-6fa7bd7b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J3zE2YuwVVJyUI8LsH5W_

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability workday-calendar-api-business-days-add-6fa7bd7b
```

Example prompt: What date is 2 business days after November 25, 2026 in the US, accounting for Thanksgiving and other public holidays?

## When to prefer this

Choose this endpoint when you need to offset a date by a specific number of business days while correctly accounting for country-specific national holidays and weekend definitions. It is ideal for financial settlement (T+N), SLA deadline computation, regulatory filing deadlines, and contract milestone tracking across 50+ countries. Prefer this over a generic date library when country-aware holiday exclusion is required without maintaining your own holiday database.

## Known failure modes

- Invalid date format (not YYYY-MM-DD) returns a 400 error
- Country code not in the supported enum list returns a 400 validation error
- Days value outside the allowed range (-999 to 999) returns a validation error
- Network timeout or worker unavailability returns a 5xx error
- Payment failure via x402 protocol results in a 402 Payment Required response

## How this service works

Date that is N business days after (or before, if negative) a start date in a country. Typical use: T+2 settlement, SLA and filing deadlines.

## Output

A JSON object containing the calculated result date (YYYY-MM-DD), the original start date, the number of days requested, the country code, and an array of skipped holidays with their dates and names that fell within the offset window.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "country",
      "date",
      "days"
     ],
     "properties": {
      "date": {
       "type": "string",
       "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
      },
      "days": {
       "type": "string",
       "pattern": "^-?\\d{1,3}$"
      },
      "country": {
       "enum": [
        "US",
        "CA",
        "MX",
        "BR",
        "AR",
        "CL",
        "CO",
        "PE",
        "GB",
        "IE",
        "FR",
        "DE",
        "NL",
        "BE",
        "LU",
        "CH",
        "AT",
        "IT",
        "ES",
        "PT",
        "SE",
        "NO",
        "DK",
        "FI",
        "PL",
        "CZ",
        "HU",
        "RO",
        "GR",
        "TR",
        "IL",
        "AE",
        "SA",
        "EG",
        "ZA",
        "NG",
        "KE",
        "IN",
        "PK",
        "BD",
        "LK",
        "SG",
        "MY",
        "ID",
        "TH",
        "VN",
        "PH",
        "HK",
        "TW",
        "CN",
        "JP",
        "KR",
        "AU",
        "NZ",
        "UA"
       ],
       "type": "string",
       "description": "ISO 3166-1 alpha-2 country code"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "days": 2,
  "start": "2026-11-25",
  "result": "2026-11-30",
  "country": "US",
  "skipped_holidays": [
   {
    "date": "2026-11-26",
    "name": "Thanksgiving Day"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/workday-calendar-api-business-days-add-6fa7bd7b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from workday-calendar.regnotes.workers.dev](https://www.zero.xyz/host/workday-calendar.regnotes.workers.dev/llms.txt)