# DNS A Record Change Watch via DNS.SB

> DNS A Record 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 DNS A records for a domain via DNS.SB, comparing current results to a 90-day history and returning whether the record changed, what changed, and when.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/watch/dns/a/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-a-record-change-watch-via-dns-sb-e864fc16
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4b_jLyCao5GhccZDe4f2-

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-a-record-change-watch-via-dns-sb-e864fc16
```

Example prompt: Watch the DNS A record for example.com using DNS.SB and let me know if it has changed since the last time we checked — show me what changed, what the old and new values are, and when it was last seen.

## When to prefer this

Choose this endpoint when you need to detect changes in DNS A records specifically as answered by DNS.SB, and want a built-in diff against a stored historical baseline rather than doing your own comparison. It is ideal for scheduled monitoring workflows, security alerting on IP changes, or verifying DNS propagation after a migration. Prefer it over a plain DNS lookup endpoint when change detection and before/after diffing are required.

## Known failure modes

- Domain not previously queried — no baseline exists for comparison, so 'changed' will be false or undefined on first call
- DNS.SB resolver unavailable — upstream resolution failure
- Invalid or malformed domain name — query may return an error
- Domain has no A record — empty result with NXDOMAIN or NOERROR/no data response
- 90-day history window expired — previous result no longer retained, no diff available

## How this service works

Change watch for dns a 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 DNS A record answer for the domain, a boolean 'changed' flag indicating whether it differs from the previous check, a list of fields that changed with before/after values, and the timestamp of when the record was last seen. History is 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/dns-a-record-change-watch-via-dns-sb-e864fc16/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)