# x402-toolbox Leap Year Check

> x402-toolbox Leap Year Check is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-29).

Checks whether a given year is a leap year, returning a boolean result via a pay-per-call API over x402.

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/time/leap-year-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-leap-year-check-19e3b87e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ite2gpW0mA65rwXLgXZOT

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 x402-toolbox-leap-year-check-19e3b87e
```

Example prompt: Is 2100 a leap year? Use the leap year check tool to give me a definitive yes or no.

## When to prefer this

Choose this endpoint when you need a quick, deterministic, no-signup computation for leap year status and are already operating in an x402 micropayment environment. Ideal for AI agents that need calendar logic without managing API keys or subscriptions — the $0.001 USDC payment serves as authentication.

## Known failure modes

- Missing or invalid year input returns an error or unexpected result
- Non-numeric schema parameter may cause malformed query
- x402 payment failure prevents access to the result
- Ambiguous or out-of-range year values may yield unexpected behavior

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON object with an 'ok' boolean indicating success and a 'paid' boolean confirming the x402 micropayment was processed, along with the leap year determination result for the queried year.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "schema": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-leap-year-check-19e3b87e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)