# Bot Bazaar Cron Expression Validator

> Bot Bazaar Cron Expression Validator is a paid API for AI agents from bot-bazaar.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Validates a 5-field cron schedule expression and timezone, classifying its execution cadence and breaking down each field.

## Facts

- Endpoint: GET https://bot-bazaar.fly.dev/v1/x402/cron-expression-check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bot-bazaar-cron-expression-validator-6893a378
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Mr3_UUijBhfHp3cLJ-T9o

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability bot-bazaar-cron-expression-validator-6893a378
```

Example prompt: Can you validate this cron expression for me — '0 9 * * 1-5' — and tell me what cadence it represents and how each field breaks down?

## When to prefer this

Use this endpoint when you need to programmatically validate and interpret standard 5-field Unix cron expressions, especially in automation pipelines, CI/CD systems, or agent workflows that schedule recurring tasks. Prefer this over manual parsing when you need both syntactic validation and semantic cadence classification in a single call.

## Known failure modes

- Invalid or malformed cron expression returns a validation error with details about which field failed
- 6-field or 7-field cron expressions (with seconds or year) are rejected as only 5-field format is supported
- Missing cron query parameter results in a bad request error
- Unrecognized timezone string may cause a validation failure or be defaulted

## How this service works

Validate a 5-field cron schedule expression and timezone, classifying execution cadence and field breakdown.

## Output

Returns a structured validation result indicating whether the cron expression is valid, a human-readable classification of the execution cadence (e.g. 'every weekday at 9am'), and a field-by-field breakdown of the minute, hour, day-of-month, month, and day-of-week components.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "cron": {
       "type": "string",
       "description": "5-field cron expression"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bot-bazaar-cron-expression-validator-6893a378/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bot-bazaar.fly.dev](https://www.zero.xyz/host/bot-bazaar.fly.dev/llms.txt)