# is-port-137-open-watch

> is-port-137-open-watch is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).

Monitors whether TCP port 137 (NetBIOS Name Service) is open on a host, comparing current results against a previous check to detect changes.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/watch/ip/port/137?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/is-port-137-open-watch-4ecd5357
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NdL-jQRgpiayPNhfmvPz4

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 is-port-137-open-watch-4ecd5357
```

Example prompt: Keep an eye on port 137 for me on host 192.168.1.50 — let me know if its open/closed status changes compared to the last time you checked.

## When to prefer this

Choose this endpoint when you need to detect state transitions on port 137 specifically rather than just checking its current status in isolation. It is ideal for scheduled monitoring workflows where you want to be alerted only when something changes, avoiding noise from repeated identical results. Prefer this over a one-shot port check when you need before/after change history and a 'changed' flag to trigger downstream automation.

## Known failure modes

- Host unreachable — connection attempt times out, port reported as closed or error
- Invalid host/IP input — returns an error or empty result
- No previous check stored — first call has no comparison baseline so 'changed' may be indeterminate
- Rate limiting or payment failure — $0.02 USDC charge fails, call is rejected
- Port 137 filtered by firewall — may falsely report as closed when it is actually firewalled

## How this service works

Change watch for is port 137 open: runs the check, compares it with the result from your previous call for the same host (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

## Output

Returns the current open/closed status of port 137 on the target host, a boolean 'changed' flag indicating whether the result differs from the previous call (stored for 90 days), an object listing which fields changed with before and after values, and a timestamp of when the status was last observed.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "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/is-port-137-open-watch-4ecd5357/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ip.intel.rallylive.ca](https://www.zero.xyz/host/ip.intel.rallylive.ca/llms.txt)