# Domain Intel MX Record Change Detector (Posteo) — dns.halowerk.com

> Domain Intel MX Record Change Detector (Posteo) — dns.halowerk.com is a paid API for AI agents from dns.halowerk.com, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-13).

Checks whether a domain's MX records have changed relative to a Posteo-observed baseline, returning current DNS, WHOIS, mail policy, TLS, and subdomain data; billed per call in USDC via x402.

## Facts

- Endpoint: POST https://dns.halowerk.com/domain/articles/mx-posteo?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/domain-intel-mx-record-change-detector-posteo-dns-halowerk-com-e87a61e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sCYJKN8gcJYesoEpmmYE3

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 domain-intel-mx-record-change-detector-posteo-dns-halowerk-com-e87a61e8 -d '<json body>'
```

Example prompt: Check whether the MX records for example.com have changed from what Posteo observed on 2024-11-01, when they pointed to mx.posteo.de with priority 10 — and give me the full current DNS, WHOIS, mail policy, and TLS cert too.

## When to prefer this

Choose this endpoint when you need a no-signup, pay-per-call way to retrieve comprehensive domain intelligence — especially when you want to detect MX record drift against a previously observed Posteo baseline. It bundles WHOIS, DNS, mail policy, TLS, and subdomains into a single call for $0.009 USDC, making it ideal for agents that need ephemeral, cost-accountable domain lookups without API key management.

## Known failure modes

- Domain not found or unresolvable — returns empty or error result
- Payment not received via x402 — 402 response requiring USDC payment
- Malformed domain input exceeding 253 characters — schema validation error
- Baseline records array exceeds 50 items — rejected by schema
- WHOIS rate limiting or registry unavailability — partial result returned
- TLS certificate lookup failure for domains without HTTPS — cert field absent

## How this service works

Domain in, WHOIS, DNS, mail policy, TLS certificate and subdomains out. Pay per call in USDC over x402. No signup, no API key.

## Output

Returns current WHOIS registration data, full DNS records, MX records with priorities, mail policy details (SPF/DKIM/DMARC), TLS certificate information, and discovered subdomains for the queried domain. When a baseline is supplied, the response also highlights any changes in MX records relative to that baseline.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "maxLength": 253
  },
  "baseline": {
   "type": "object",
   "required": [
    "domain",
    "observed_at",
    "records"
   ],
   "properties": {
    "domain": {
     "type": "string",
     "maxLength": 253
    },
    "records": {
     "type": "array",
     "items": {
      "type": "object",
      "required": [
       "exchange",
       "priority"
      ],
      "properties": {
       "exchange": {
        "type": "string",
        "maxLength": 254
       },
       "priority": {
        "type": "integer",
        "maximum": 65535,
        "minimum": 0
       }
      },
      "additionalProperties": false
     },
     "maxItems": 50
    },
    "observed_at": {
     "type": "string",
     "maxLength": 40
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/domain-intel-mx-record-change-detector-posteo-dns-halowerk-com-e87a61e8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.halowerk.com](https://www.zero.xyz/host/dns.halowerk.com/llms.txt)