# USPS.com Downtime Change Watch

> USPS.com Downtime 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).

Monitors usps.com availability and alerts when its status changes compared to a previous check, returning current status, changed flag, diffed fields, and last-seen timestamp.

## Facts

- Endpoint: GET https://monitor.intel.rallylive.ca/watch/monitor/is-down/usps-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/usps-com-downtime-change-watch-0d0f59ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ALZ3GmjTgn2sWZtLxkmKd

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 usps-com-downtime-change-watch-0d0f59ac
```

Example prompt: Keep an eye on usps.com and let me know the moment its availability status changes — tell me what changed, what it looked like before, and when it was last seen.

## When to prefer this

Choose this endpoint when you need change-detection semantics for usps.com — not just the current status, but whether it has changed since your last poll. Ideal for scheduling periodic checks and triggering alerts only when something changes, rather than processing the same 'up' result repeatedly. Prefer this over a plain is-down check when you want diff tracking and before/after field comparison.

## Known failure modes

- No previous check stored — first call returns current status with no diff data
- USPS.com itself is unreachable — check may reflect network error rather than site outage
- Stored result older than 90 days — previous baseline may have been purged, resetting diff history
- Payment not processed — endpoint requires $0.02 USDC per call via x402 protocol

## How this service works

Change watch for is usps 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 availability status of usps.com, a boolean 'changed' flag indicating whether the result differs from the previous call (retained for 90 days), a list of fields that changed with before/after values, and the timestamp of when the status was last seen.

## 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/usps-com-downtime-change-watch-0d0f59ac/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)