# x402.nsgoods.org Watchdog Paid Registration

> x402.nsgoods.org Watchdog Paid Registration is a paid API for AI agents from x402.nsgoods.org, paid per call via x402, $5/call, status unknown (last checked 2026-09-13).

Registers a paid 30-day signed monitoring subscription for a single x402 HTTP endpoint, delivering alerts to an email or webhook channel

## Facts

- Endpoint: GET https://x402.nsgoods.org/watchdog/register/paid
- Price: $5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-nsgoods-org-watchdog-paid-registration-b37fa748
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EDEFIYSbweQl1gjjBtYgX

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 x402-nsgoods-org-watchdog-paid-registration-b37fa748
```

Example prompt: Register a 30-day watchdog on https://api.example.com/pay for me and send any alerts to my webhook at https://hooks.myapp.com/x402-alerts — I want the signed monitoring proof that it's active.

## When to prefer this

Choose this endpoint when you need cryptographically signed, verifiable proof of endpoint monitoring (not just informal uptime checks), specifically for x402-protocol endpoints. Prefer it over generic monitoring services when you need a tamper-evident signed registration artifact and 30-day coverage tied to a specific x402 URL and alert channel.

## Known failure modes

- Invalid or non-x402 endpoint URL provided — registration rejected
- Alert channel is malformed (invalid email or non-HTTPS webhook URL)
- Payment of $5 USDC not fulfilled via x402 protocol — 402 response returned
- Unsupported HTTP method supplied (only GET, HEAD, DELETE allowed)
- Endpoint already registered and active — duplicate registration conflict
- Network timeout or provider unavailability during registration

## How this service works

Paid Watchdog registration: 30 days of signed monitoring for one x402 endpoint. Free preview: GET /watchdog/preview

## Output

Returns a signed monitoring registration object including schema_version, type, tier, signer identifier, and a cryptographic signature confirming that the specified x402 endpoint is enrolled in 30-day uptime monitoring with alerts delivered to the specified channel.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "endpoint",
      "channel"
     ],
     "properties": {
      "channel": {
       "type": "string",
       "description": "email address or https webhook URL for alerts."
      },
      "endpoint": {
       "type": "string",
       "description": "https x402 endpoint URL to monitor."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "schema_version",
      "type",
      "tier",
      "signer",
      "signature"
     ],
     "properties": {
      "tier": {
       "type": "string"
      },
      "type": {
       "type": "string"
      },
      "signer": {
       "type": "string"
      },
      "signature": {
       "type": "string"
      },
      "schema_version": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-nsgoods-org-watchdog-paid-registration-b37fa748/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.nsgoods.org](https://www.zero.xyz/host/x402.nsgoods.org/llms.txt)