# Subway.com Downtime Change Watcher

> Subway.com Downtime Change Watcher is a paid API for AI agents from monitor.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).

Runs a live uptime check for subway.com, compares the result to the previous call (stored 90 days), and returns whether anything changed, what fields changed, and when it was last seen.

## Facts

- Endpoint: GET https://monitor.intel.rallylive.ca/watch/monitor/is-down/subway-com?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/subway-com-downtime-change-watcher-be1b7aea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VEnb7icgKaLrgW6QB24K-

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 subway-com-downtime-change-watcher-be1b7aea
```

Example prompt: Keep an eye on subway.com for me — run a check now and tell me if anything has changed since the last time you checked, including whether it went up or down and what fields flipped.

## When to prefer this

Use this endpoint when you need change detection for subway.com specifically — not just a point-in-time status check. It is ideal for scheduled polling workflows where you want to be alerted only when something changes, avoiding alert fatigue from repeated 'still down' reports. Prefer this over a plain is-down check when you care about transitions (up→down or down→up) and want before/after field diffs.

## Known failure modes

- Network error reaching subway.com — may return an error status rather than up/down result
- No previous call stored — 'changed' may be null or false on first invocation
- Stale state if 90-day retention window has expired — baseline is lost
- Payment failure ($0.02 USDC required) — request rejected before check runs
- Cloudflare or CDN interference may affect the live check result

## How this service works

Change watch for is subway com down: runs the check, compares it with the result from your previous call for the same query (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 up/down status of subway.com, a boolean 'changed' flag indicating whether the result differs from the previous call, a list of fields that changed with their before and after values, and a timestamp of when the status was last observed. Previous results are retained for 90 days per query.

## 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/subway-com-downtime-change-watcher-be1b7aea/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from monitor.intel.rallylive.ca](https://www.zero.xyz/host/monitor.intel.rallylive.ca/llms.txt)