# Docker Hub Availability Change Watcher

> Docker Hub Availability 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).

Monitors whether hub.docker.com is down, detects changes since the last check, and returns current status with before/after diff fields.

## Facts

- Endpoint: GET https://monitor.intel.rallylive.ca/watch/monitor/is-down/hub-docker-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/docker-hub-availability-change-watcher-00740617
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PCW5tg2o-UMPGJ7JJON9V

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 docker-hub-availability-change-watcher-00740617
```

Example prompt: Keep an eye on Docker Hub for me — run a check on hub.docker.com and tell me whether its status has changed since the last time you checked, including what fields changed and what the before and after values were.

## When to prefer this

Use this endpoint when you need change-aware monitoring of Docker Hub availability — specifically when you want to know not just current status but whether it has changed since your last check, with structured before/after diffs. Prefer this over a plain is-down check when you are building alerting workflows, scheduled monitors, or need to avoid redundant notifications on unchanged state.

## Known failure modes

- No previous check stored (first call returns changed=false or null diff)
- hub.docker.com unreachable from monitoring infrastructure (may report false positive outage)
- Stale comparison if previous result is older than 90-day retention window
- Payment failure via x402 protocol prevents check from running

## How this service works

Change watch for is hub docker 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 hub.docker.com, a boolean 'changed' flag indicating whether the result differs from the previous call (stored up to 90 days), the specific fields that changed with their before and 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/docker-hub-availability-change-watcher-00740617/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)