# Unix Millisecond Timestamp Validator

> Unix Millisecond Timestamp Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Checks whether a given string is a valid 13-digit Unix milliseconds timestamp

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-date-unix-ms?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/unix-millisecond-timestamp-validator-4026f264
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jXW9Om5yVxh15KOylUbS6

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 unix-millisecond-timestamp-validator-4026f264 -d '<json body>'
```

Example prompt: Can you check whether the string '1716825600000' is a valid 13-digit Unix milliseconds timestamp?

## When to prefer this

Use this endpoint when you need a fast, deterministic check that a string is exactly 13 digits and represents a plausible Unix millisecond epoch — without spinning up an LLM or writing custom regex. Prefer the free sandbox POST /v1/sandbox/check-date-unix-ms first; fall back to this paid endpoint only when the sandbox is unavailable or you need production reliability.

## Known failure modes

- Empty or missing value field returns validation error
- String longer than 20000 characters rejected by schema
- Non-string input may cause schema mismatch
- Payment failure or insufficient USDC balance blocks the call
- Sandbox endpoint should be tried first to avoid unnecessary charges

## How this service works

Call when an agent needs whether a string is 13-digit Unix milliseconds. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/check-date-unix-ms first.

## Output

Returns a boolean or structured response indicating whether the input string is a valid 13-digit Unix milliseconds timestamp, with no network calls or LLM involved — pure format and range validation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "1700000000000"
   ],
   "maxLength": 20000,
   "minLength": 1,
   "description": "Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."
  },
  "schema": {
   "description": "JSON Schema document for schema-check SKUs. Omit it on string checks."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/unix-millisecond-timestamp-validator-4026f264/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)