# DomainSignal Domain Classification & DNS Intelligence

> DomainSignal Domain Classification & DNS Intelligence is a paid API for AI agents from api.servocenter.com, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Classifies a domain (or email/URL) as disposable, free provider, custom, or unresolved, and audits its DNS/mail security configuration including SPF, MX, and website DNS presence.

## Facts

- Endpoint: GET https://api.servocenter.com/api/v1/domain/classify
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/domainsignal-domain-classification-dns-intelligence-f1742971
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8i62HKor4odH3Cz0MT1EY

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 domainsignal-domain-classification-dns-intelligence-f1742971
```

Example prompt: Can you check whether 'mailinator.com' is a disposable email domain, see if it has SPF and MX records configured, and tell me how confident you are in the classification?

## When to prefer this

Choose this endpoint when you need to qualify or screen a domain or email address for legitimacy, detect disposable or free email providers at signup, audit DNS and mail security posture (SPF, MX), or enrich lead data with domain intelligence — especially in automated pipelines where per-call pay-as-you-go pricing (via x402) is preferred over subscription APIs.

## Known failure modes

- Domain not found or unresolvable — classification returns 'unresolved' with low confidence
- Invalid input format (non-domain string) — may return error or low-confidence result
- Transient DNS lookup failures — may produce stale or incomplete DNS audit data
- Edge-case TLDs or very new domains may have lower confidence scores

## How this service works

Pay-per-result domain qualification, DNS security audits, and website intelligence over x402.

## Output

Returns a JSON object with the queried domain, a classification label (disposable_email, free_email_provider, custom_domain, or unresolved), boolean flags for has_dns, website_dns_present, mail_configured, spf_configured, disposable, and free_email_provider, the detected MX provider (or null), a confidence score between 0 and 1, and an observed_at timestamp.

## 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",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain name, URL, or email address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "domain",
      "classification",
      "has_dns",
      "website_dns_present",
      "mail_configured",
      "mx_provider",
      "spf_configured",
      "disposable",
      "free_email_provider",
      "confidence",
      "observed_at"
     ],
     "properties": {
      "domain": {
       "type": "string"
      },
      "has_dns": {
       "type": "boolean"
      },
      "confidence": {
       "type": "number",
       "maximum": 1,
       "minimum": 0
      },
      "disposable": {
       "type": "boolean"
      },
      "mx_provider": {
       "anyOf": [
        {
         "type": "string"
        },
        {
         "type": "null"
        }
       ]
      },
      "observed_at": {
       "type": "string",
       "format": "date-time"
      },
      "classification": {
       "enum": [
        "disposable_email",
        "free_email_provider",
        "custom_domain",
        "unresolved"
       ],
       "type": "string"
      },
      "spf_configured": {
       "type": "boolean"
      },
      "mail_configured": {
       "type": "boolean"
      },
      "free_email_provider": {
       "type": "boolean"
      },
      "website_dns_present": {
       "type": "boolean"
      }
     },
     "additionalProperties": false
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "example.com",
  "confidence": 0.93,
  "classification": "custom_domain",
  "mail_configured": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/domainsignal-domain-classification-dns-intelligence-f1742971/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.servocenter.com](https://www.zero.xyz/host/api.servocenter.com/llms.txt)