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Cron Expression Explainer & Validator
x402
Cron Expression Explainer & Validator is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Parses a cron expression or macro into a plain-English description, validates it, buckets its frequency, and estimates runs per day
Price / call$0.002
Success—
StatusUnknown
How this service works
Cron expression parser. Takes a 5/6/7-field cron expression or @yearly/@monthly/@weekly/@daily/@hourly macro and returns a plain-English explanation, frequency bucket, validation result, and a runs-per-day estimate. Useful for explaining a schedule to a human, validating a cron string, or generating a cadence summary.
Output
Returns a plain-English description of the schedule (e.g. 'Every weekday at 9:00 AM'), a frequency bucket (e.g. 'daily', 'hourly', 'weekly'), a boolean validation result with any error messages, and a numeric runs-per-day estimate.
Example use cases
Example prompt
“Can you explain what the cron expression '0 9 * * 1-5' means in plain English, tell me if it's valid, and estimate how many times per day it runs?”
Technical details
Endpoint
POSThttps://x402.agentutility.ai/cron-explainWhen to prefer
Use this endpoint when an agent or user needs to understand, validate, or summarize a cron schedule string without running code locally. Ideal for displaying human-readable schedule descriptions in UIs, confirming a cron string is syntactically correct before deploying a job, or estimating execution frequency for capacity planning.
Side effects
- Invalid cron expression with wrong number of fields returns validation error and explanation of the syntax problem
- Unsupported macro returns error indicating which macros are accepted
- Ambiguous or malformed field values (e.g. out-of-range day numbers) return a validation failure with details
- Empty or null input returns a 400-level error
Input
{
"input": {
"body": {
"timezone": "UTC",
"expression": "0 9 * * 1-5"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"model": "hermes-3-llama-3.1-405b",
"fields": {
"year": "",
"hours": "9",
"month": "*",
"minutes": "0",
"seconds": "0",
"day_of_week": "1-5",
"day_of_month": "*"
},
"source": "morpheus",
"is_valid": true,
"timezone": "UTC",
"frequency": "daily",
"expression": "0 9 * * 1-5",
"explanation": "At 09:00 AM every weekday (Monday through Friday)",
"validation_notes": [],
"field_explanations": {
"year": "",
"hours": "at hour 9",
"month": "every month",
"minutes": "at minute 0",
"seconds": "at second 0",
"day_of_week": "on weekdays (Monday through Friday)",
"day_of_month": "every day of the month"
},
"estimated_runs_per_day": 1
}Schema · Response
{
"type": "json",
"example": {
"frequency": "daily",
"explanation": "At 9:00 AM on every weekday"
}
}Tags
x402
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