APIs › Agent & Developer Utilities › Cron Expression Validator

Cron Expression Validator

Validates a cron expression, explains each field in plain language and returns the next fire times in a chosen time zone.

POST /v1/developer/cron-validate $0.003 per call

Specification

Endpoint

POST /v1/developer/cron-validate

Price

$0.003 per call · tier micro_data

Payment

x402 on X Layer (chain 196) · settled in USDG or USDT0 · schemes exact, aggr_deferred

Data source

Deterministic local computation on caller-supplied input

Timeout

15 seconds

Max request

2 MB

Version

1.0.0

Calling it

The first call returns a 402 with the payment challenge. Retry with a signed authorisation in the X-PAYMENT header — see the payment guide for the exact shape.

curl -i -X POST "https://api.dana-edu.pp.ua/v1/developer/cron-validate" \
  -H "content-type: application/json" \
  -d '{ ... }'

Response

Real output, captured by running this endpoint at build time — not written by hand. Volatile fields such as timestamps are elided. Captured 2026-07-31.

{
  "valid": true,
  "expression": "0 9 * * 1-5",
  "field_count": 5,
  "timezone": "Asia/Baghdad",
  "explanation": [
    {
      "field": "minute",
      "value": "0",
      "meaning": "at minute 0"
    },
    {
      "field": "hour",
      "value": "9",
      "meaning": "at hour 9"
    },
    {
      "field": "day of month",
      "value": "*",
      "meaning": "every day of month"
    },
    {
      "field": "month",
      "value": "*",
      "meaning": "every month"
    },
    {
      "field": "day of week",
      "value": "1-5",
      "meaning": "day of week from 1 through 5"
    }
  ],
  "next_fire_times": [
    "<varies per call>",
    "<varies per call>",
    "<varies per call>"
  ],
  "interval_seconds_between_fires": [
    "<varies per call>",
    "<varies per call>"
  ]
}

Every response is wrapped in the same envelope: data plus warnings, sources, confidence, informational_only and a measured processing_ms. See the envelope reference.

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