# PennyRail Working Days Remaining Calculator

> PennyRail Working Days Remaining Calculator is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Calculates the number of working days remaining in a given period, locale-aware, as a brief summary

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/skill/locale.brief--working-days-remaining
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-working-days-remaining-calculator-091660f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Odv7bHE7gnTMIXKaLsfz1

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 pennyrail-working-days-remaining-calculator-091660f3 -d '<json body>'
```

Example prompt: How many working days are left in this month for the UK locale? Give me a brief summary.

## When to prefer this

Choose this endpoint when you need a quick, locale-aware count of remaining working days without building your own holiday calendar logic. It is especially useful for scheduling, project management, payroll, or deadline-tracking workflows where regional business day definitions matter and you want a pay-per-use model rather than maintaining calendar data yourself.

## Known failure modes

- Missing or malformed locale code returns an error or defaults to a generic calendar
- Invalid or ambiguous date range yields a computation error
- Unsupported locale may return null or an unrecognized-locale error
- Payment failure (402) blocks execution entirely
- Empty input object causes schema validation rejection

## How this service works

Machine-readable settlement service

## Output

Returns a brief, machine-readable summary containing the count of working days remaining in the requested period, adjusted for the specified locale (accounting for regional holidays and weekend definitions).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-working-days-remaining-calculator-091660f3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)