# Business Day Calendars – Is Business Day Check

> Business Day Calendars – Is Business Day Check 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 2026-10-29).

Checks whether a given date is a business day across one or more settlement calendars (NYSE, Federal Reserve, TARGET2, UK)

## Facts

- Endpoint: GET https://business-days.quietworklabs.workers.dev/v1/is-business-day?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/business-day-calendars-is-business-day-check-dac7a920
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AqqbA6Qvt6pSlqsEjxPFx

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 business-day-calendars-is-business-day-check-dac7a920
```

Example prompt: Is November 27 2026 a business day on the NYSE calendar, and does it have an early close?

## When to prefer this

Use this endpoint when you need a fast, reliable single-date business day check against financial settlement calendars (NYSE, Fed, TARGET2, UK). Prefer it over generic holiday APIs when you specifically need settlement-calendar semantics, NYSE early-close awareness, or multi-calendar intersection checks.

## Known failure modes

- Missing required 'date' query parameter returns an error
- Invalid date format (non-YYYY-MM-DD) returns a parse error
- Unknown or misspelled calendar identifier may return an error or be ignored
- Dates outside the 2000-2099 range may not be supported
- Network or payment (x402) failure prevents response

## 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 a JSON object with: isBusinessDay (boolean), dayOfWeek, the list of calendars checked, closedBy (which calendars mark it closed), earlyClose details (name, calendar, and close time if applicable), nextBusinessDay, and previousBusinessDay — all for the queried date.

## 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": [
      "date"
     ],
     "properties": {
      "date": {
       "type": "string",
       "description": "Date YYYY-MM-DD"
      },
      "calendars": {
       "type": "string",
       "description": "Comma list of calendars; a day is a business day only if open in all. XNYS (NYSE), FED (Fedwire/FedACH), TARGET2 (EUR), UK-ENG. Aliases: NYSE, US, ACH, EUR, UK. Default FED."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "date": "2026-11-27",
  "closedBy": [],
  "calendars": [
   {
    "id": "XNYS",
    "name": "NYSE"
   }
  ],
  "dayOfWeek": "Friday",
  "earlyClose": [
   {
    "name": "Day after Thanksgiving",
    "calendar": "XNYS",
    "closeTime": "13:00 America/New_York"
   }
  ],
  "isBusinessDay": true,
  "nextBusinessDay": "2026-11-30",
  "previousBusinessDay": "2026-11-25"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/business-day-calendars-is-business-day-check-dac7a920/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from business-days.quietworklabs.workers.dev](https://www.zero.xyz/host/business-days.quietworklabs.workers.dev/llms.txt)