# Halowerk Domain Intel — MX SendGrid Article Endpoint

> Halowerk Domain Intel — MX SendGrid Article Endpoint 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).

Accepts a domain and optional MX baseline and returns WHOIS, DNS, mail policy, TLS certificate, and subdomain intelligence, with specific focus on SendGrid MX record analysis, paid per call in USDC via x402.

## Facts

- Endpoint: POST https://dns.halowerk.com/domain/articles/mx-sendgrid?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/halowerk-domain-intel-mx-sendgrid-article-endpoint-41456c44
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nN_l06Zoxu-DNXDnUdOx1

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 halowerk-domain-intel-mx-sendgrid-article-endpoint-41456c44 -d '<json body>'
```

Example prompt: Can you look up the full domain intelligence for sendgrid.com — I want to know its MX records, DNS config, mail policy, TLS certificate, and subdomains, and check whether the MX records match this baseline: exchange 'mx.sendgrid.net' at priority 10, observed on 2024-01-15?

## When to prefer this

Choose this endpoint when you need comprehensive domain intelligence — especially mail infrastructure and SendGrid MX record verification — without requiring an API key or subscription. Ideal for one-off audits, due diligence checks, or automated monitoring agents that pay per call in USDC. Prefer over traditional WHOIS or DNS tools when you also need TLS certificate data, subdomain enumeration, and mail policy in a single call, and when you specifically need to compare current MX records against a stored baseline.

## Known failure modes

- Invalid or malformed domain name returns a validation error
- Domain not found in public DNS returns empty or null record fields
- Baseline object missing required fields (domain, observed_at, records) returns a schema validation error
- Payment failure via x402 results in 402 Payment Required response and no data returned
- Rate limits or upstream DNS timeouts may cause partial or delayed responses

## 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 a structured intelligence report for the queried domain covering WHOIS registration details, DNS records, mail policy (SPF/DKIM/DMARC), TLS certificate information, discovered subdomains, and detailed MX record data including whether SendGrid is used; if a baseline is provided, includes comparison against observed historical MX records.

## 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/halowerk-domain-intel-mx-sendgrid-article-endpoint-41456c44/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)