# Well-Known Scan Change Watch

> Well-Known Scan Change Watch is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Runs a well-known file scan for a domain and returns whether the result has changed since the previous call, including a field-level diff with before/after values.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/site/well-known
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/well-known-scan-change-watch-76e297a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eHivP0Swz_EaJDqGC7I_j

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 well-known-scan-change-watch-76e297a9
```

Example prompt: Check if the well-known scan for example.com has changed since the last time you checked, and tell me exactly which fields are different now.

## When to prefer this

Use this endpoint when you need to track changes to a domain's well-known files over time, rather than just retrieving a one-time snapshot. It is ideal for scheduled monitoring pipelines where you want automatic field-level diffs without maintaining your own state, since the service stores the previous result for 90 days. Prefer it over a raw scan endpoint when the key question is 'did anything change?' rather than 'what is the current value?'

## Known failure modes

- Domain not provided or invalid — scan cannot be executed
- No previous result stored (first call for a domain) — changed may be false or indeterminate
- Domain unreachable or well-known endpoint returns non-200 — scan result may be empty or error
- Previous result expired beyond 90-day retention — comparison not possible
- Rate limit or payment failure — request rejected

## How this service works

Change watch for well known scan: runs the check and compares it with the result from your previous call for the same domain (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when well-known file scan changes. $0.01 per check.

## Output

Returns the current well-known scan result, a boolean changed field indicating whether it differs from the previous call, a list of exactly which fields changed with their before and after values, and a timestamp of when the result was last seen. Previous results are retained for 90 days.

## 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/well-known-scan-change-watch-76e297a9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)