# how.is DNSSEC Validation Check

> how.is DNSSEC Validation Check is a paid API for AI agents from how.is, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).

Checks whether DNSSEC is signed and validates correctly for a given domain, including chain of trust and DS/DNSKEY records.

## Facts

- Endpoint: POST https://how.is/v1/domain/dnssec?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/how-is-dnssec-validation-check-e0d6a05c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g9IxzQJpvIxNiHGqkBoQW

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 how-is-dnssec-validation-check-e0d6a05c -d '<json body>'
```

Example prompt: Can you check if DNSSEC is properly signed and validates correctly for cloudflare.com — I want to see the chain of trust and any DS or DNSKEY records.

## When to prefer this

Use this endpoint when you need to programmatically verify DNSSEC configuration for a domain — especially before trusting DNS-resolved addresses for payment, authentication, or sensitive API integrations. Prefer this over manual dig/delv commands when operating in an automated agent workflow. It provides structured output including chain of trust details, DS and DNSKEY records, and actionable recommendations in a single call.

## Known failure modes

- Domain does not exist or is not registered — may return empty or error state
- Domain has no DNSSEC records — isSigned will be false
- DNSSEC is signed but chain of trust is broken — isValid false with errors
- Malformed domain input exceeding 253 characters — input validation error
- Transient DNS resolver issues may cause intermittent validation failures

## How this service works

Whether DNSSEC is signed and validates for a domain.

## Output

Returns a JSON object indicating whether the domain has DNSSEC signed (isSigned), whether it validates correctly (isValid), a validationStatus string, the full chainOfTrust, the DS records, DNSKEY records, and any errors, warnings, or recommendations found during validation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "maxLength": 253,
   "description": "A bare domain name, e.g. example.com"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "_shape": "data.data: isSigned, isValid, validationStatus, chainOfTrust, dsRecords, dnskeyRecords, errors, warnings, recommendations."
  },
  "result": "DNSSEC for the requested subject",
  "receipt": {
   "rail": "x402",
   "tool": "dnssec",
   "charge_usd": 0.005,
   "settlement_tx": "0x…"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/how-is-dnssec-validation-check-e0d6a05c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from how.is](https://www.zero.xyz/host/how.is/llms.txt)