# Settled Watchdog — 30-Day x402 Endpoint Monitor

> Settled Watchdog — 30-Day x402 Endpoint Monitor is a paid API for AI agents from settled.tools, paid per call via x402, $1/call, status unknown (last checked 2026-10-11).

Registers a 30-day monitoring subscription for one x402 endpoint, probing it every 15 minutes and posting signed JSON alerts to a webhook whenever its status, price, payability, or payTo address changes.

## Facts

- Endpoint: POST https://settled.tools/v1/watch?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/settled-watchdog-30-day-x402-endpoint-monitor-449dff60
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_78LtYRpjG-VmLOVbD3JTo

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 settled-watchdog-30-day-x402-endpoint-monitor-449dff60 -d '<json body>'
```

Example prompt: Set up a 30-day Settled watchdog on https://api.example.com/search and send any signed alerts to https://my-app.com/hooks/settled — I want to know immediately if its price, status, or payTo address changes.

## When to prefer this

Use this endpoint when you need continuous, automated change detection on a specific x402 endpoint over 30 days — not just a one-time liveness check. Prefer this over the single-probe check endpoint when you need webhook-driven alerts for price drift, payTo address changes, or availability degradation without polling yourself. Best suited for agent workflows that must react to payment-API changes in near-real-time.

## Known failure modes

- Invalid or non-x402 URL returns an error — the target must be a valid https x402 endpoint
- Non-https webhook URL rejected — both url and webhook must use https
- Payment failure ($1 USDC required) prevents watch creation
- Target endpoint unreachable at registration time may still create a watch but baseline status will reflect unreachable
- Webhook delivery failures on the receiver side are the caller's responsibility — Settled does not retry indefinitely

## How this service works

Watchdog: 30 days of signed webhook alerts for one x402 endpoint. Settled keeps probing it and POSTs an EIP-191-signed JSON alert to your webhook whenever its status, payability, price or payTo changes (checked every 15 minutes), plus one notice at expiry. Body: {url, webhook}. Verify any alert at /v1/verify.

## Output

Returns a JSON object with a watch_id, a status field ('active'), a baseline snapshot of the endpoint's current status/price/payability, links to poll or manage the watch, and an expires_at timestamp 30 days out. Settled then probes the endpoint every 15 minutes and POSTs EIP-191-signed JSON alerts to the provided webhook on any detected change, plus a final notice at expiry.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "url",
      "webhook"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Absolute https URL of the x402 endpoint to watch"
      },
      "webhook": {
       "type": "string",
       "description": "https URL that receives POSTed alerts"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://api.example.com/search",
  "alerts": "https://settled.tools/v1/watch/3f9c…/alerts",
  "manage": "https://settled.tools/v1/watch/3f9c…",
  "status": "active",
  "baseline": {
   "status": "live",
   "price_usd": 0.01,
   "payability": "payable"
  },
  "delivery": "poll",
  "watch_id": "3f9c…",
  "expires_at": "2026-10-28T00:00:00.000Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/settled-watchdog-30-day-x402-endpoint-monitor-449dff60/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from settled.tools](https://www.zero.xyz/host/settled.tools/llms.txt)