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Agentshelf Cron-5 Expression Validator
x402
Agentshelf Cron-5 Expression Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).
Validates whether a given string is a valid 5-field cron expression
Price / call$0.004
Success—
StatusUnknown
How this service works
Call when an agent needs whether a string is a 5-field cron expression. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/check-cron-5 first.
Output
Returns whether the provided string is a valid 5-field cron expression, indicating if the input conforms to the standard minute, hour, day-of-month, month, and day-of-week format.
Example use cases
Validate scheduled job before deployment
“Before I deploy this task scheduler config, can you verify that '0 9 * * 1-5' is a properly formatted 5-field cron expression?”
Debug malformed cron string
“My automation pipeline is failing — can you check whether '30 8 * * * *' is a valid 5-field cron expression or if the format is wrong?”
Validate user-submitted cron input
“A user just submitted '0 0 1 1 *' as their scheduled report time — can you confirm that's a valid 5-field cron expression before I save it?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-cron-5?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, programmatic check that a cron string is exactly a 5-field expression (no LLM guessing). Prefer the free sandbox endpoint /v1/sandbox/check-cron-5 first; use this paid endpoint only when the sandbox is unavailable or rate-limited. Ideal for pipelines that must validate user-submitted cron schedules before storing or executing them.
Side effects
- Empty or missing value field returns an error
- String exceeding 20000 characters rejected
- Non-string input may be rejected or mishandled
- 6-field or 7-field cron expressions (with seconds or year) may be flagged as invalid even if otherwise well-formed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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