# Cron Next 6-8 UTC Times Calculator

> Cron Next 6-8 UTC Times Calculator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Given a 6-field cron expression and an optional start datetime, returns the next 8 UTC scheduled execution times for that cron schedule.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/cron-next-6-8?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cron-next-6-8-utc-times-calculator-2322f6bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-aVqwuRMO1nkoS5wgbrC7

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 cron-next-6-8-utc-times-calculator-2322f6bf -d '<json body>'
```

Example prompt: What are the next 8 UTC times the cron expression '0 9 * * 1-5 *' will fire, starting from 2024-06-01T00:00:00Z?

## When to prefer this

Choose this endpoint when you need deterministic, serverless computation of upcoming cron schedule times without running your own scheduler. It handles 6-field cron expressions (including seconds), requires no infrastructure, and returns exactly 8 future UTC timestamps per call. Prefer this over spinning up a cron library locally when operating in an agent context that lacks a runtime environment.

## Known failure modes

- Invalid or malformed cron expression returns a validation error
- Expression with fewer or more than 6 fields is rejected
- Unparseable 'from' datetime format returns a 400 error
- Payment not included or insufficient results in 402 Payment Required
- Cron expression that never fires (e.g. Feb 30) may return an error or empty result

## How this service works

Call when an agent needs the next 8 UTC times for a 6-field cron expression. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/cron-next-6-8 first.

## Output

Returns an ordered list of the next 8 UTC datetime values at which the given 6-field cron expression would fire, starting from the specified 'from' datetime (or now if omitted). Each timestamp is in ISO 8601 / UTC format.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "from": {
   "type": "string",
   "format": "date-time",
   "examples": [
    "2026-01-01T00:00:00.000Z"
   ],
   "description": "ISO datetime to count forward from. Omit it to start at the current time."
  },
  "expression": {
   "type": "string",
   "examples": [
    "0 0 * * * *"
   ],
   "maxLength": 200,
   "minLength": 1,
   "description": "Cron expression. The route says whether it is 5 fields or 6 fields. Example: 0 9 * * 1-5."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cron-next-6-8-utc-times-calculator-2322f6bf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)