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Agent402 UK Cron Expression Validator & Next Fire Times
x402
Agent402 UK Cron Expression Validator & Next Fire Times is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status down (last checked 2026-10-12).
Validates a cron expression and returns the next N scheduled fire times in a specified IANA timezone, optionally starting from a given ISO datetime.
Price / call$0.001
Success—
StatusDown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
Returns a JSON object containing: the origin datetime used ('from'), an array of next fire times as ISO strings ('next'), the requested count, a 'valid' boolean indicating whether the cron expression is syntactically correct, the resolved IANA timezone, the original expression, and a normalized form of the expression.
Example use cases
Verify weekday morning job schedule
“I'm setting up a job that should run at 9am every weekday in London. Can you validate the cron expression '0 9 * * 1-5' and show me the next 10 fire times in Europe/London timezone so I can confirm it's right?”
Debug a complex cron before deploying
“Before I deploy this cron job, can you check whether '30 4 1,15 * *' is valid and tell me the next 5 times it would fire in America/New_York timezone starting from 2026-09-01?”
Preview scheduler loop execution times
“I'm building a scheduler loop and need to preview exactly when '*/15 * * * *' will fire — can you give me the next 20 run times in UTC so I can plan my retry windows?”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/time/cron?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need deterministic, IANA timezone-aware cron schedule validation and fire-time preview — particularly inside scheduler loops, deployment pipelines, or agent workflows that need to confirm schedule correctness before committing. Prefer this over client-side cron libraries when you need authoritative server-side validation with timezone normalization, or when the agent runtime lacks a reliable cron parser.
Side effects
- Invalid cron expression returns valid:false with no fire times
- Count outside 1–50 range may return a validation error
- Unrecognized IANA timezone string causes an error
- Malformed ISO 'from' datetime causes a parse error
- Missing required 'expression' field returns an error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tz | string | IANA timezone (default UTC) |
| from | string | ISO origin for next fires (default now) |
| count | number | How many next runs (1-50) |
| expression | string | Cron expression (5 or 6 field) |
Output
Schema · Response
{
"type": "json",
"example": {
"from": "2026-08-11T00:00:00.000Z",
"next": [
"2026-08-11T08:00:00.000Z",
"2026-08-12T08:00:00.000Z"
],
"count": 5,
"valid": true,
"timezone": "Europe/London",
"expression": "0 9 * * 1-5",
"normalized": "0 9 * * 1-5"
}
}Tags
x402
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