# SignalDesk AI – JSON Pointer Select

> SignalDesk AI – JSON Pointer Select is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Extracts a value from a JSON document at a specified RFC 6901 JSON Pointer path, returning whether the pointer was found and the resolved value.

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/json/select-pointer?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-json-pointer-select-cae20707
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kF5TJRt1GE70f3HHYGuxb

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 signaldesk-ai-json-pointer-select-cae20707 -d '<json body>'
```

Example prompt: I have this JSON object and I want to extract the value at the path /users/0/name — can you run the select-pointer tool on it and tell me what it resolves to?

## When to prefer this

Use this endpoint when you need to extract a single field from a known JSON structure using a precise RFC 6901 pointer path, especially in agentic pipelines where you want a lightweight, paid micro-call rather than parsing JSON locally. Prefer this over general-purpose JSON tools when working within a Cloudflare Workers / x402 payment-gated ecosystem.

## Known failure modes

- Pointer path not found in data — returns {"found": false} with no value
- Malformed RFC 6901 pointer syntax — may return a 400 error
- Input data too large or deeply nested beyond bounded structure limits
- Invalid JSON supplied as data — parse error response
- Payment not processed — 402 response blocking execution

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object with a boolean `found` field indicating whether the pointer resolved successfully, and a `value` field containing the extracted data at that path (e.g. {"found": true, "value": "Ana"}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "description": "JSON value; bounded structure."
  },
  "pointer": {
   "type": "string",
   "maxLength": 512,
   "description": "RFC 6901 pointer."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "found": true,
  "value": "Ana"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-json-pointer-select-cae20707/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)