# DNS CNAME Change Watch via DNS.SB

> DNS CNAME Change Watch via DNS.SB is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Monitors CNAME DNS records for a domain via DNS.SB, detects changes compared to the previous check, and returns current values with a changed flag and before/after diffs.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/watch/dns/cname/via/dnssb?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-cname-change-watch-via-dns-sb-e2c079c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vTGmfov1QDUCGYHLjARg1

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 dns-cname-change-watch-via-dns-sb-e2c079c1
```

Example prompt: Watch the CNAME records for example.com via DNS.SB and let me know if anything has changed since the last time you checked — show me what changed and what it was before.

## When to prefer this

Use this endpoint when you need to detect changes in CNAME DNS records specifically as seen through the DNS.SB resolver, and you want automatic before/after diffing without managing your own snapshot state. Prefer it over raw DNS lookup endpoints when your goal is change detection and alerting rather than one-time record retrieval. Ideal for scheduled polling workflows where you need to be notified only when something actually changes.

## Known failure modes

- Domain not previously checked — no baseline exists for comparison, so 'changed' is indeterminate on first call
- DNS.SB resolver unavailable or times out — no records returned
- Invalid domain format — query rejected
- CNAME record does not exist for domain — empty record set returned
- 90-day baseline expired — previous snapshot no longer available for comparison

## How this service works

Change watch for dns cname via dnssb: runs the check, compares it with the result from your previous call for the same domain (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 CNAME records for the domain as answered by DNS.SB, a boolean 'changed' flag, a list of fields that changed with before/after values, and a timestamp of when the records were last seen. Results are compared against the previous check stored for up to 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/dns-cname-change-watch-via-dns-sb-e2c079c1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)