# JSON Schema 2019-09 Validator

> JSON Schema 2019-09 Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-29).

Validates a value against a JSON Schema Draft 2019-09 schema, returning dialect-aware compliance results

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/check-schema-2019-09?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/json-schema-2019-09-validator-4222ecfb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XLKHeKEzMmarnJ15PPPWd

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 json-schema-2019-09-validator-4222ecfb -d '<json body>'
```

Example prompt: Check whether this JSON value passes my 2019-09 schema — the schema requires an object with an integer 'age' field using exclusiveMinimum of 0, and the value is {"age": 25}.

## When to prefer this

Choose this endpoint when you specifically need JSON Schema Draft 2019-09 dialect validation, particularly when exclusive bounds (exclusiveMinimum/exclusiveMaximum) or format keyword behavior under 2019-09 semantics matters. Prefer the free sandbox POST /v1/sandbox/check-schema-2019-09 first; use this paid endpoint when the sandbox is unavailable or for production-grade validation at $0.008 USDC per call.

## Known failure modes

- Value or schema missing from request body returns an error
- Schema string exceeds 20,000 character limit results in rejection
- Malformed JSON schema causes parse error
- Dialect-specific format or exclusive bounds edge cases may differ from other draft behaviors
- Network timeout or service unavailability returns HTTP error

## How this service works

Call when an agent needs a limited JSON Schema 2019-09 check. Dialects disagree on exclusive bounds and format. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/check-schema-2019-09 first.

## Output

A JSON response indicating whether the provided value conforms to the given JSON Schema 2019-09 schema, including any validation errors or violations found during the check.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "examples": [
    {
     "a": 1
    }
   ],
   "description": "JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."
  },
  "value": {
   "type": "string",
   "examples": [
    "{\"a\":1}"
   ],
   "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": {
   "examples": [
    {
     "type": "object",
     "required": [
      "a"
     ],
     "properties": {
      "a": {
       "type": "integer"
      }
     }
    }
   ],
   "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/json-schema-2019-09-validator-4222ecfb/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)