# DNSBL Check Change Watch

> DNSBL Check 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).

Monitors an IP address against DNS blacklists, returning the current result plus a diff (changed/unchanged, before/after field values) compared to the previous check stored for 90 days.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/dns/blacklist
- 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/dnsbl-check-change-watch-3191b268
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ArBk64uSyBN3VQGex7xD9

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 dnsbl-check-change-watch-3191b268
```

Example prompt: Keep an eye on whether 203.0.113.42 shows up on any DNS blacklists — check it on a schedule and tell me if anything has changed since the last time you looked, including exactly which blacklist fields flipped and what the before and after values were.

## When to prefer this

Choose this endpoint when you need to detect changes in an IP's DNS blacklist status over time rather than just a one-time snapshot. It is ideal for scheduled monitoring agents, deliverability pipelines, or security workflows where you need to know precisely when and how blacklist status changed, with before/after field-level diffs, rather than re-implementing your own diffing logic.

## Known failure modes

- Missing or invalid IP address parameter returns an error
- IP not previously checked — no baseline stored yet, so no diff is available on first call
- Results older than 90 days are purged, resetting the comparison baseline
- Network timeouts reaching upstream DNSBL providers
- Malformed query parameters return a 400-level error

## How this service works

Change watch for dnsbl check: runs the check and compares it with the result from your previous call for the same ip (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 ip blacklist changes. $0.01 per check.

## Output

Returns the current DNS blacklist check result for the IP, a boolean 'changed' flag indicating whether anything differs from the previous call, a detailed diff showing exactly which fields changed with before and after values, and the timestamp of when the IP was last seen — with prior results 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/dnsbl-check-change-watch-3191b268/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)