# SignalDesk AI – Start of Month Date Calculator

> SignalDesk AI – Start of Month Date Calculator is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Returns the first day of the month (YYYY-MM-DD) for any given Gregorian date input in UTC

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/date/start-of-month?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-start-of-month-date-calculator-accdf7ae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_awWKoIyremw7ZDki9rUCu

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 signaldesk-ai-start-of-month-date-calculator-accdf7ae -d '<json body>'
```

Example prompt: What's the first day of the month for October 15, 2026? Use the start-of-month calculator with date 2026-10-15.

## When to prefer this

Use this endpoint when you need a fast, stateless, paid-metered UTC-based calculation of the first day of the month for any given date — particularly useful in automated billing, reporting, or scheduling pipelines where the x402 micropayment model fits and you need deterministic calendar math without building it yourself.

## Known failure modes

- Invalid date format (not matching YYYY-MM-DD pattern) returns an error
- Date string with wrong length (not exactly 10 chars) rejected by schema validation
- Out-of-range month or day values may cause computation errors
- Missing 'date' field in request body may return a validation error
- Payment failure or quota exhaustion may block the call entirely

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

A JSON object with a single 'date' field containing the ISO 8601 date string (YYYY-MM-DD) representing the first day of the month corresponding to the input date, computed in UTC.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "date": {
   "type": "string",
   "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
   "maxLength": 10,
   "minLength": 10,
   "description": "Gregorian date YYYY-MM-DD, interpreted in UTC."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "date": "2026-10-01"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-start-of-month-date-calculator-accdf7ae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)