# UUID Nil Validator

> UUID Nil Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-02).

Validates whether a given string is a UUID nil (all-zeros UUID: 00000000-0000-0000-0000-000000000000)

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/id-uuid-nil?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/uuid-nil-validator-a29a7d59
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6HM6sz90kMc_lUVSiJJbf

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-nil-validator-a29a7d59 -d '<json body>'
```

Example prompt: Can you check if this string is a valid nil UUID: '00000000-0000-0000-0000-000000000000'?

## When to prefer this

Use this endpoint when you need to programmatically verify whether a UUID string is the nil/zero UUID (00000000-0000-0000-0000-000000000000) and do not want to implement the check yourself. Prefer the free sandbox endpoint (/v1/sandbox/id-uuid-nil) when available to avoid the $0.009 USDC cost. Choose this over general UUID validators when you specifically need nil UUID detection rather than version-specific UUID validation.

## Known failure modes

- Empty or missing value field returns validation error
- String exceeding 20000 characters rejected
- Malformed request body returns error
- Payment of exact $0.009 USDC required or request is rejected

## How this service works

Call when an agent needs whether a string is a valid uuid-nil. No network. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/id-uuid-nil first.

## Output

Returns a boolean or validation result indicating whether the provided string matches the UUID nil format (all-zeros: 00000000-0000-0000-0000-000000000000), with no network calls required as the check is purely local string 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": [
    "00000000-0000-0000-0000-000000000000"
   ],
   "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-nil-validator-a29a7d59/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)