# Losbeto x402-Watch — x402 Endpoint Uptime Monitor

> Losbeto x402-Watch — x402 Endpoint Uptime Monitor is a paid API for AI agents from api.losbeto.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-10).

Starts a 30-day uptime and price-change monitoring watch on any public x402 endpoint, firing webhook notifications on status or price changes and returning a capability URL for free polling.

## Facts

- Endpoint: GET https://api.losbeto.xyz/x402-watch?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/losbeto-x402-watch-x402-endpoint-uptime-monitor-d8989345
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VIEXJBl1uHKAsNdiUeYv2

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 losbeto-x402-watch-x402-endpoint-uptime-monitor-d8989345
```

Example prompt: Start a 30-day x402 watch on https://api.example.com/my-endpoint and send status or price-change alerts to https://my-server.com/webhook — I want to know immediately if it goes down or the USDC price changes.

## When to prefer this

Choose this endpoint when you need continuous, automated monitoring of an x402-protocol endpoint — yours or a competitor's — with webhook-driven alerting on state changes or price shifts. Prefer it over generic uptime monitors because it understands the x402 402-payment shape, validates USDC pricing, and integrates natively with the x402 payment ecosystem. Ideal for x402 API operators who want reliability assurance or competitive intelligence on pricing changes without standing up their own monitoring infrastructure.

## Known failure modes

- Private or internal IP ranges are refused — the target URL must be publicly reachable
- Missing required query parameters (url or webhook) return a 400 error
- Invalid or non-https webhook URL may be rejected
- Payment failure (insufficient USDC balance) returns a 402 and the watch is not started
- Target endpoint returning non-x402 HTTP responses may be flagged as non-compliant rather than down

## How this service works

OpenAI-compatible LLM gateway at $0.005/call — change base_url, pay in USDC. Plus pay-per-call market data: multi-oracle price consensus, sentiment, forex, equities, commodities, Brazil macro (BCB/B3) and crypto. No API keys, no accounts. USDC on Base, Solana, Algorand and Polygon via x402.

## Output

Returns a watch_id and a capability URL that can be polled for free at any time to get the current state (up/down, latency, HTTP status, 402 shape validity, current USDC price). Also fires a JSON POST to the provided webhook URL whenever the endpoint's state flips (up↔down) or its USDC price changes, for the full 30-day monitoring window.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "queryParams": {
     "type": "object",
     "required": [
      "url",
      "webhook"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Public http/https URL to fetch (internal/private ranges refused)"
      },
      "webhook": {
       "type": "string",
       "description": "webhook parameter"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "type": "object",
     "description": "30-day watch on ANY x402 endpoint — yours or a competitor's. We measure it immediately (up/down, latency, HTTP status, correct 402 shape, current USDC price) and then re-check every 30 minutes for 30 days. State flips and price changes fire a JSON POST to your ?webhook=; pull current state anytime, free, via the returned watch_id capability URL. Built for x402 sellers monitoring..."
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/losbeto-x402-watch-x402-endpoint-uptime-monitor-d8989345/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.losbeto.xyz](https://www.zero.xyz/host/api.losbeto.xyz/llms.txt)