# Grokzilla Cron Expression Validator & Next-Run Scheduler

> Grokzilla Cron Expression Validator & Next-Run Scheduler is a paid API for AI agents from grokzilla.shop, paid per call via x402, $0.0031/call, status unknown (last checked 2026-10-18).

Validates a cron expression and returns its next 1–20 scheduled run times in any IANA time zone, with DST-aware local ISO, UTC ISO, and epoch seconds outputs.

## Facts

- Endpoint: POST https://grokzilla.shop/api/skills/cron-next?utm_source=zero.xyz
- Price: $0.0031/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/grokzilla-cron-expression-validator-next-run-scheduler-e9a134a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A2kEtDsaU4IZCQ-Yea15f

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 grokzilla-cron-expression-validator-next-run-scheduler-e9a134a4 -d '<json body>'
```

Example prompt: Can you validate the cron expression '0 9 * * MON-FRI' and show me the next 10 times it will fire, in America/New_York time?

## When to prefer this

Choose this endpoint when you need deterministic, offline cron parsing with full DST awareness, support for named month/weekday tokens (JAN-DEC, SUN-SAT), step and range syntax, and @daily/@hourly macros, and you want multiple output formats (local ISO, UTC ISO, epoch) in one call. Prefer it over generic cron libraries when working inside an agent tool-call context that benefits from a pay-per-use micro-service with no infrastructure to manage.

## Known failure modes

- Invalid cron expression syntax returns a validation error with details
- Unrecognized IANA timezone string causes rejection
- Count outside 1–20 range is rejected
- Malformed 'from' datetime string causes a parse error
- Network is not involved so there are no connectivity failures

## How this service works

Validate a 5-field cron expression (lists, ranges, steps, JAN-DEC/SUN-SAT names, @daily/@hourly macros) and return its next 1-20 run times in any IANA time zone (DST-aware), as local ISO, UTC ISO and epoch seconds. Deterministic, no network.

## Output

Returns a structured response containing: validation status of the cron expression, and for valid expressions a list of up to 20 next scheduled run times each expressed as a local ISO 8601 datetime (in the requested IANA time zone), a UTC ISO 8601 datetime, and a Unix epoch seconds integer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tz": {
   "type": "string",
   "default": "UTC",
   "maxLength": 64,
   "minLength": 1
  },
  "expr": {
   "type": "string",
   "maxLength": 200,
   "minLength": 1
  },
  "from": {
   "type": "string",
   "maxLength": 64,
   "minLength": 1
  },
  "count": {
   "type": "integer",
   "default": 5,
   "maximum": 20,
   "minimum": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/grokzilla-cron-expression-validator-next-run-scheduler-e9a134a4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from grokzilla.shop](https://www.zero.xyz/host/grokzilla.shop/llms.txt)