# UUID v4 Validator

> UUID v4 Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).

Validates whether a given string is a valid UUID v4 format, without any network calls or external lookups.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/id-uuid-v4?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/uuid-v4-validator-93ba083d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XYgD9-Bu8NLaWG20sFBIA

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 uuid-v4-validator-93ba083d -d '<json body>'
```

Example prompt: Can you check whether '550e8400-e29b-41d4-a716-446655440000' is a valid UUID v4?

## When to prefer this

Use this endpoint when you need a quick, deterministic, offline check of whether a string is a valid UUID v4 — no LLM, no network lookups, just a regex/format check. Prefer the free sandbox endpoint POST /v1/sandbox/id-uuid-v4 first if available. Choose this paid endpoint only when the sandbox is unavailable or you need guaranteed SLA. Good for pipelines that need to validate UUIDs at scale without risk of external dependencies.

## Known failure modes

- Empty or missing 'value' field returns an error
- Input exceeding 20,000 characters is rejected
- Malformed request body returns a 4xx error
- Payment of exactly $0.006 USDC required; incorrect payment causes 402 response
- String with correct length but wrong version/variant bits returns false (not an error)

## How this service works

Call when an agent needs whether a string is a valid uuid-v4. No network. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/id-uuid-v4 first.

## Output

Returns a boolean-style verdict indicating whether the provided string is a valid UUID v4 (conforms to the 8-4-4-4-12 hexadecimal pattern with version bits set to 4 and the appropriate variant bits). No external network calls are made during 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": [
    "11111111-1111-4111-8111-111111111111"
   ],
   "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/uuid-v4-validator-93ba083d/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)