# Domain Intel MX / ImprovMX Check — Halowerk

> Domain Intel MX / ImprovMX Check — Halowerk 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 a domain's MX records and validates whether it uses ImprovMX as its mail provider, with optional baseline comparison for change detection.

## Facts

- Endpoint: POST https://dns.halowerk.com/domain/articles/mx-improvmx?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-improvmx-check-halowerk-5e164147
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KWU6-4q-2r3MVXSnzaQA2

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-improvmx-check-halowerk-5e164147 -d '<json body>'
```

Example prompt: Can you check whether example.com is using ImprovMX for its email routing — look up its current MX records and compare against these baseline records I saw last week: exchange=mx.improvmx.com priority=10, observed on 2024-06-01?

## When to prefer this

Choose this endpoint when you specifically need to verify ImprovMX mail routing configuration or detect MX record drift against a known baseline, without requiring an API key or signup. It is ideal for lightweight, pay-per-call DNS/mail checks in automated pipelines where per-query USDC micropayments via x402 are acceptable. Prefer alternatives if you need full WHOIS, TLS, or subdomain data — those may be on sibling endpoints.

## Known failure modes

- Domain does not exist or has no MX records — returns empty records array
- Domain name exceeds 253 characters — rejected by input validation
- Baseline records array exceeds 50 items — rejected
- Payment not provided or insufficient USDC — 402 Payment Required response
- DNS resolution timeout — transient error, retry recommended
- Malformed domain string — 400 Bad Request

## 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 the domain's current MX records (exchange and priority), identifies whether ImprovMX is the configured mail provider, and if a baseline is supplied, provides a diff indicating what has changed since the baseline observation timestamp.

## 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-improvmx-check-halowerk-5e164147/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)