# usaref Working Days / Government Reference Data Series

> usaref Working Days / Government Reference Data Series is a paid API for AI agents from usaref.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns a specific North American government reference data series (e.g. public holidays, minimum wage, VAT, policy rate) for a given country

## Facts

- Endpoint: POST https://usaref.dev/v1/answers/working-days
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/usaref-working-days-government-reference-data-series-00426c0b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zKWDWxVKtCLRRt0GEwCFa

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 usaref-working-days-government-reference-data-series-00426c0b -d '<json body>'
```

Example prompt: What is the current minimum wage in the US according to usaref? Also check whether the data is marked stale.

## When to prefer this

Use this endpoint when you need authoritative, government-sourced reference values for North American and Central American countries — especially tax rates, minimum wages, central bank policy rates, CPI, or official public holiday calendars. Prefer this over generic web search when you need structured, machine-readable data with source attribution and freshness metadata.

## Known failure modes

- Invalid or unsupported country code returns a 400 or 404 error
- Invalid series name returns a 400 or 404 error
- Payment not provided or insufficient triggers a 402 Payment Required response
- Data marked stale (stale: true) means it is past its expected update cycle and may be outdated
- Network or upstream timeout may result in a 500 error

## How this service works

Working days in a date range: weekends + public holidays applied, next working day

## Output

A JSON object containing the series identifier, country code, current value (a number for rates/wages or an array of {date, name} objects for holiday calendars), effective_from date, last_confirmed date, source attribution, a stale boolean flag, optional unit and notes, and an optional components array breaking down composite rates.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/usaref-working-days-government-reference-data-series-00426c0b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from usaref.dev](https://www.zero.xyz/host/usaref.dev/llms.txt)