# AmericanExpress.com Down Status Change Watch

> AmericanExpress.com Down Status Change Watch 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).

Checks if americanexpress.com is currently down, compares the result with the previous check (retained 90 days), and returns whether the status has changed along with before/after field values.

## Facts

- Endpoint: GET https://monitor.intel.rallylive.ca/watch/monitor/is-down/americanexpress-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/americanexpress-com-down-status-change-watch-9a61039d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uonD-m3PZq-Ljkh-SIM32

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 americanexpress-com-down-status-change-watch-9a61039d
```

Example prompt: Keep an eye on americanexpress.com for me and let me know if its up/down status has changed since the last time you checked — I want to know what changed and when.

## When to prefer this

Use this endpoint when you specifically need change-detection for americanexpress.com availability — not just a one-time status check. It is ideal for scheduled polling workflows where you want to be notified only when something changes, avoiding alert fatigue from repeated identical results. Prefer this over a generic HTTP ping when you need before/after diff context and a persistent 90-day history of results.

## Known failure modes

- No previous check exists (first call returns current state only, changed=false or null)
- americanexpress.com itself is unreachable due to network issues unrelated to site status
- Cached result is stale beyond 90 days, clearing comparison baseline
- Payment of $0.02 USDC not processed, resulting in 402 response
- Transient check failure returns ambiguous down status

## How this service works

Change watch for is americanexpress 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 americanexpress.com, a boolean indicating whether the status changed since the last call, a list of fields that changed with their before and after values, and the timestamp of when the status was last observed. Results are compared against a cached result from up to 90 days prior.

## 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/americanexpress-com-down-status-change-watch-9a61039d/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)