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Cron Expression 6-Field Validator
x402
Cron Expression 6-Field Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-29).
Validates whether a given string is a syntactically correct 6-field cron expression
Price / call$0.005
Success—
StatusUnknown
How this service works
Call when an agent needs whether a string is a 6-field cron expression. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/check-cron-6 first.
Output
Returns a boolean or structured result indicating whether the input string conforms to the 6-field cron expression format, potentially including which field(s) are invalid or why the expression fails validation.
Example use cases
Validate user-submitted cron schedule
“A user just entered '0 15 10 * * ?' as their scheduled job trigger — can you verify whether that's a valid 6-field cron expression before we save it?”
Debug broken cron job config
“My cron job keeps failing to parse — can you check if '*/5 * * * *' is a valid 6-field cron expression? I think I might be missing a field.”
Automate schedule config validation
“Before deploying this workflow, check that '0 0 12 1/1 * ?' is a properly formatted 6-field cron expression so we don't end up with a broken scheduler.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-cron-6?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to definitively validate a 6-field cron expression (which includes a seconds field, common in Quartz/Spring schedulers) before storing or executing it. Prefer the free sandbox endpoint POST /v1/sandbox/check-cron-6 first for development or testing; use this paid endpoint in production when sandbox is unavailable or rate-limited. Choose this over general regex checks when you need authoritative, server-side cron validation without writing your own parser.
Side effects
- Empty string input returns validation error or invalid result
- String exceeding 20000 characters rejected
- Non-cron strings (plain text, 5-field cron) may return false/invalid
- Network or payment failure (x402 payment required, $0.005 USDC) causes request to fail
- Malformed JSON body returns HTTP 400
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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