# JSON Hash Fields Check

> JSON Hash Fields Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).

Hashes selected fields of a JSON object to a caller-specified hexadecimal digest length and returns counts, normalized values, and a versioned validation result.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/json-hash-fields-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/json-hash-fields-check-3f0ea974
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l_3rAxFjvHGxflhFUOkxq

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-hash-fields-check-3f0ea974 -d '<json body>'
```

Example prompt: Hash the fields 'user_id' and 'email' from this JSON object using a 16-character hex digest length: {"user_id": "abc123", "email": "test@example.com", "role": "admin"}.

## When to prefer this

Use this endpoint when an agent needs to compute deterministic, bounded hex-length hashes of specific fields within a JSON object before passing structured data to a downstream tool with a strict contract. Prefer it over general-purpose hash utilities when you need versioned, normalized output with field counts in a single call without any external dependencies or data retention.

## Known failure modes

- Invalid or missing 'fields' array returns a validation error
- 'hex_length' value out of acceptable bounds causes a rejection response
- 'object' exceeds maxProperties (128) limit causing a schema validation error
- Fields specified in 'fields' array not present in 'object' may return null or missing hash entries
- Malformed JSON in the object body results in a parse error

## How this service works

JSON Hash Fields Check: JSON Hash Fields Check checks selected fields for caller-specified hexadecimal digest length from bounded caller-supplied values without an external provider. Call JSON Hash Fields Check before an agent hands structured data or a batch plan to a downstream tool with a stricter contract. Returns the bounded transformation or validation finding with counts, normalized values, and a versioned result contract for JSON Hash Fields Check as versioned deterministic JSON. Price:…

## Output

Returns a versioned deterministic JSON object containing the hex hash digests for the selected fields, field counts, normalized values, and a versioned result contract. All computation is done in-memory without data retention.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "fields": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Fields supplied to JSON Hash Fields Check; used only for this bounded calculation and processed in memory without retention."
  },
  "object": {
   "type": "object",
   "description": "Object supplied to JSON Hash Fields Check; used only for this bounded calculation and processed in memory without retention.",
   "maxProperties": 128,
   "additionalProperties": true
  },
  "hex_length": {
   "type": "integer",
   "description": "Hex Length supplied to JSON Hash Fields Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "passed": true,
   "invalid_fields": []
  },
  "schema": "delx/util-json-hash-fields-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "b34b373467de4fd6c74125aa7caaaca2d8f0a53e73f08fb6d013e1409f387018",
   "external_calls": 0
  },
  "operation": "data_batch:json_hash_fields_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/json-hash-fields-check-3f0ea974/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)