# Stumble Sniper Watch

> Stumble Sniper Watch is a paid API for AI agents from stumble.vimabrosta.com, paid per call via x402, $2/call, status unknown (last checked 2026-09-14).

Polls a public URL every 10 seconds for up to 48 hours and fires a webhook within seconds when a specified condition becomes true (keyword, CSS selector, JSON path, price, content change, or HTTP status).

## Facts

- Endpoint: POST https://stumble.vimabrosta.com/v1/watches/sniper
- Price: $2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stumble-sniper-watch-235b8ec2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gNqovg_GQIBl18augZZkC

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 stumble-sniper-watch-235b8ec2 -d '<json body>'
```

Example prompt: Watch https://shop.example.com/drops/sneaker-001 every 10 seconds for up to 48 hours and hit my webhook at https://hooks.myapp.com/notify the moment the keyword 'Add to Cart' appears on the page.

## When to prefer this

Choose this endpoint over the standard watch (15-min polling) or fast watch (60-sec polling) when seconds matter — product drops, flash sales, or any event where missing the window by even a minute has real cost. It polls every 10 seconds for up to 48 hours, making it the highest-frequency, shortest-duration option in the Stumble suite. Best suited for single high-value detection events rather than long-running ongoing monitoring.

## Known failure modes

- Target URL is unreachable or returns persistent errors — watch may exhaust duration without firing
- Invalid condition type or misconfigured JSON path/selector — condition never matches
- Webhook URL is unreachable — notification delivery fails silently
- Duration exceeds 2-day maximum — request rejected
- URL format invalid — request rejected at intake
- Payment of $2 USDC not completed — endpoint returns 402 and watch is not created

## How this service works

Create a sniper watch: Stumble polls a public URL every 10 seconds for up to 48 hours and notifies your webhook within seconds of a condition becoming true (keyword, selector, JSON path, price, content change, HTTP status). One-time $2.00, no account needed. Ideal for drops and on-sale moments where seconds matter.

## Output

Returns a watch ID confirming the sniper watch is active. While running, delivers near-real-time notifications to the specified webhook URL (or holds results for polling) the moment the condition is met — including matched content, the triggering URL, condition details, and timestamp. Polling stops as soon as the condition fires or the duration expires.

## 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": {
     "type": "object",
     "required": [
      "url",
      "condition"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri"
      },
      "notify": {
       "type": "object",
       "required": [
        "mode"
       ],
       "properties": {
        "url": {
         "type": "string"
        },
        "mode": {
         "enum": [
          "webhook",
          "poll"
         ],
         "type": "string"
        },
        "format": {
         "enum": [
          "json",
          "slack",
          "discord"
         ],
         "type": "string"
        }
       }
      },
      "condition": {
       "type": "object",
       "required": [
        "type"
       ],
       "properties": {
        "type": {
         "enum": [
          "keyword",
          "selector",
          "json_path",
          "price",
          "content_change",
          "status",
          "sitemap",
          "feed"
         ],
         "type": "string"
        }
       }
      },
      "duration_days": {
       "type": "number",
       "maximum": 2
      }
     }
    },
    "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"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stumble-sniper-watch-235b8ec2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stumble.vimabrosta.com](https://www.zero.xyz/host/stumble.vimabrosta.com/llms.txt)