# DNSSEC Trust Chain Validator

> DNSSEC Trust Chain Validator is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Checks DNSSEC validation status for a domain using Cloudflare's 1.1.1.1 DNS-over-HTTPS resolver, returning the AD flag, DS records, and DNSKEY/KSK records.

## Facts

- Endpoint: GET https://api.fadeandco.workers.dev/api/agent-intel/dnssec-trust-chain-validator?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dnssec-trust-chain-validator-a2ff91fa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GkWZWxmM218Na6CQEXF4-

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 dnssec-trust-chain-validator-a2ff91fa
```

Example prompt: Can you check whether ietf.org has DNSSEC properly validated — I want to know if Cloudflare's resolver sets the AD flag, and whether there are DS records and key-signing keys in place?

## When to prefer this

Choose this endpoint when you need a quick, resolver-perspective DNSSEC status check using Cloudflare's 1.1.1.1 infrastructure. It's ideal for automated compliance checks, pre-deployment audits, or security monitoring where you want to know if a domain is DNSSEC-signed and resolver-validated without running your own full chain validation. Not suitable if you need an independent cryptographic chain-walk from the root, or if you need to validate DNSSEC signatures yourself rather than relying on a trusted resolver's AD flag.

## Known failure modes

- Domain does not exist (NXDOMAIN) — may return RCODE 3 with no DS/DNSKEY data
- Domain has no DS record in parent zone — verdict is UNSIGNED
- Resolver unreachable — timeout or upstream error from Cloudflare 1.1.1.1
- Invalid or malformed domain input — may return an error or unexpected result
- Domain exists but DNSSEC is misconfigured — resolver may return SERVFAIL (RCODE 2)

## How this service works

DNSSEC status for a domain using Cloudflare's public resolver (1.1.1.1 DNS-over-HTTPS): whether the resolver validated the answer (AD flag), the DS records in the parent zone, and the DNSKEY records with key-signing keys. The validation is done by Cloudflare's resolver, not by this tool walking the chain to the root.

## Output

Returns a JSON object with: the domain checked, a verdict string (e.g. VALIDATED_BY_RESOLVER, UNSIGNED), whether the resolver set the AD flag (resolverValidated boolean), the RCODE for the A record query, an array of DS records (keyTag, algorithm, digestType), the count of DNSKEY records, the number of key-signing keys, the source resolver URL, and a timestamp. Also includes a note clarifying that validation relies on Cloudflare's resolver AD flag rather than an independent chain walk.

## 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 such as ietf.org (a URL is reduced to its host)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Validation is by the Cloudflare resolver's AD flag, not an independent chain walk from the root. An UNSIGNED result means no DS record exists in the parent zone.",
  "domain": "ietf.org",
  "rcodeA": 0,
  "source": "https://1.1.1.1/dns-query",
  "verdict": "VALIDATED_BY_RESOLVER",
  "checkedAt": "2026-10-23T09:35:21.650Z",
  "dsRecords": [
   {
    "keyTag": 2371,
    "algorithm": 13,
    "digestType": 2
   }
  ],
  "dnskeyCount": 2,
  "keySigningKeys": 1,
  "resolverValidated": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dnssec-trust-chain-validator-a2ff91fa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fadeandco.workers.dev](https://www.zero.xyz/host/api.fadeandco.workers.dev/llms.txt)