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Cron Expression Parser & Next-Run Calculator
x402
Cron Expression Parser & Next-Run Calculator is a paid API for AI agents from toolbelt402.tpoborne.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Parses and validates a cron expression, returning the next N scheduled run times as ISO 8601 timestamps in any IANA timezone.
Price / call$0.001
Success—
StatusUnknown
How this service works
Parse and validate a cron expression — returns the next N run times as ISO timestamps in any IANA timezone. Cron schedule checker.
Output
Returns an array of the next N ISO 8601 timestamps representing when the cron expression will trigger, calculated in the specified IANA timezone. Includes validation feedback if the expression is malformed.
Example use cases
Debugging a misconfigured cron job
“My cron job is set to '0 0 30 2 *' and it never seems to fire — can you validate that expression and show me when it would next run, if ever?”
Previewing a new deployment schedule
“I'm setting up a job with the cron expression '15 3 * * 0' — can you give me the next 7 run times in Europe/London so I can confirm it runs on Sunday nights?”
Verifying a billing job schedule
“We run billing with '0 8 1 * *' — show me the next 5 times it'll fire in America/Chicago so I can make sure it lines up with our billing cycle.”
Technical details
Endpoint
GEThttps://toolbelt402.tpoborne.workers.dev/cron/nextWhen to prefer
Use this endpoint when you need to quickly validate or preview cron schedules without running a live cron daemon or installing a library. Ideal for agents automating DevOps workflows, checking job configurations, or building scheduling UIs where users need to confirm what times their cron expression will fire in a specific timezone.
Side effects
- Invalid cron expression returns an error indicating the expression could not be parsed
- Unsupported or misspelled IANA timezone returns a timezone-not-found error
- Requesting more than 100 runs (max) returns a validation error
- Missing required 'expr' query parameter returns a 400 bad request
- Extremely sparse cron schedules (e.g. every Feb 30) may return zero or few results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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