# GeekVault Cron Expression Explainer

> GeekVault Cron Expression Explainer is a paid API for AI agents from api.geekvault.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Accepts a 5-field cron expression and returns a plain-language explanation of what it means and when it triggers.

## Facts

- Endpoint: GET https://api.geekvault.dev/dev-tools/v1/cron-explain?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/geekvault-cron-expression-explainer-612a7b1f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2fGR1Zhd3tOWsnZlbtPBw

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 geekvault-cron-expression-explainer-612a7b1f
```

Example prompt: Can you explain what the cron expression '0 9 * * 1-5' means — like, when exactly does it run and how often?

## When to prefer this

Choose this endpoint when an AI agent or developer needs to quickly decode a 5-field cron expression into plain English without setting up any authentication or subscriptions — ideal for one-off lookups paid per call via USDC on Base.

## Known failure modes

- Invalid or malformed cron expression (wrong number of fields, unsupported characters) may return an error
- Missing required 'expr' parameter causes a 400-level error
- Non-standard cron syntax (e.g. 6-field with seconds) may not be supported

## How this service works

Network, docs, image, web, and dev utility tools paid per call via x402. No signup, no API keys, no subscriptions — just USDC on Base.

## Output

Returns a JSON object containing the original cron expression echoed back and a human-readable explanation describing when and how frequently the schedule triggers.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "expr"
 ],
 "properties": {
  "expr": {
   "type": "string",
   "description": "Expresión cron de 5 campos: minuto hora dia-del-mes mes dia-de-semana."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "expr",
  "explanation"
 ],
 "properties": {
  "expr": {
   "type": "string"
  },
  "explanation": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/geekvault-cron-expression-explainer-612a7b1f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.geekvault.dev](https://www.zero.xyz/host/api.geekvault.dev/llms.txt)