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Cron Expression Validator & Explainer
x402
Cron Expression Validator & Explainer is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Validates a cron expression, translates it into plain English, and lists its next scheduled run times in any DST-aware time zone.
Price / call$0.003
Success—
StatusUnknown
How this service works
Validate a 5-field cron expression (ranges, steps, names, @daily aliases), explain it in plain English and list its next run times in any time zone, DST-aware.
Output
A JSON object containing: a boolean validity flag, the original expression, a plain English explanation of each field (minutes, hours, days, months, weekdays), the IANA time zone used, an array of upcoming run timestamps (ISO 8601 with UTC offset), and the maximum number of times the job can run per day.
Example use cases
Debugging a misconfigured CI pipeline schedule
“My CI pipeline is set to run on the cron schedule '0 2 * * *' — can you validate it and tell me what it means in plain English, and show me the next 5 times it'll fire in America/New_York?”
Planning a business hours job with DST awareness
“I want to make sure my scheduled job uses '*/15 9-17 * * mon-fri' — can you confirm it's valid, explain exactly when it runs, and list the next 20 occurrences in Europe/Madrid so I can check DST is handled correctly?”
Checking a @weekly alias before deployment
“Before I deploy, can you verify that '@weekly' is a valid cron expression, tell me what it actually means, and show the next 3 run times in Asia/Tokyo?”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/cron-explain?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically validate, interpret, or debug a cron expression — especially when DST-correct scheduling in a specific time zone matters, or when you need to enumerate upcoming execution times. It handles 5-field expressions, step and range syntax, day/month names, and @aliases like @daily and @hourly, making it more thorough than a simple syntax checker.
Side effects
- Invalid cron expression returns valid:false with no next_runs
- Unrecognized IANA time zone string causes an error response
- Upcoming count outside 1-50 range is rejected
- Malformed or missing expression field returns a validation error
- Invalid ISO datetime in 'since' field causes a parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"zone": "Europe/Madrid",
"valid": true,
"next_runs": [
"2026-10-02T16:45+02:00",
"2026-10-02T17:00+02:00"
],
"expression": "*/15 9-17 * * mon-fri",
"explanation": "minute 0, 15, 30, 45, hour 9, 10, 11, 12, 13, 14, 15, 16, 17, any day of month, every month, weekday Monday, Tuesday, Wednesday, Thursday, Friday",
"max_runs_per_day": 36
}
}Tags
x402
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