# Cron Next 5-3: Next 3 UTC Execution Times for 5-Field Cron Expression

> Cron Next 5-3: Next 3 UTC Execution Times for 5-Field Cron Expression is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).

Given a 5-field cron expression and an optional start datetime, returns the next 3 UTC scheduled execution times

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/cron-next-5-3?utm_source=zero.xyz
- Price: $0.003/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-5-3-next-3-utc-execution-times-for-5-field-cron-expression-92efffac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CqHB5VG0mKPTLZWJ08b-H

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-5-3-next-3-utc-execution-times-for-5-field-cron-expression-92efffac -d '<json body>'
```

Example prompt: What are the next 3 UTC times that the cron expression '0 9 * * 1-5' will fire, starting from 2025-06-01T00:00:00Z?

## When to prefer this

Choose this endpoint when you need a lightweight, pure-compute cron schedule calculator that returns the next 3 UTC execution times for a standard 5-field cron expression, especially in agentic pipelines that need to reason about upcoming job schedules without spinning up a full scheduling library. Prefer the free sandbox endpoint (/v1/sandbox/cron-next-5-3) for development/testing; use this paid endpoint in production when the sandbox is unavailable or rate-limited.

## Known failure modes

- Invalid cron expression (wrong number of fields, unsupported syntax) returns an error
- Malformed or non-ISO8601 'from' datetime triggers a validation error
- Expression with no future matches (e.g., Feb 30) may return an error or empty result
- Payment failure or insufficient USDC balance results in HTTP 402 rejection

## How this service works

Call when an agent needs the next 3 UTC times for a 5-field cron expression. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/cron-next-5-3 first.

## Output

Returns a list of the next 3 UTC datetime strings representing the upcoming scheduled execution times for the given 5-field cron expression, computed from the provided start time (or current time if omitted).

## 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 * * * *"
   ],
   "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-5-3-next-3-utc-execution-times-for-5-field-cron-expression-92efffac/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)