# Lookproof DNS SOA Record Checker

> Lookproof DNS SOA Record Checker is a paid API for AI agents from api.lookproof.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Retrieves and validates a domain's SOA record through public resolvers, checking primary server, contact, serial, and all zone transfer timers against RFC 1912 and RFC 2308.

## Facts

- Endpoint: GET https://api.lookproof.dev/v1/dns/soa?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lookproof-dns-soa-record-checker-7a1e13f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bRejugPcrB_-eKN25TzUB

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 lookproof-dns-soa-record-checker-7a1e13f4
```

Example prompt: Can you pull the SOA record for cloudflare.com and tell me the zone serial, refresh and retry timers, and whether they comply with RFC 1912?

## When to prefer this

Use this endpoint when you need to inspect or validate the authoritative zone metadata for a domain — especially for debugging DNS negative caching (lingering NXDOMAIN), understanding zone transfer schedules, verifying serial number freshness, or auditing RFC compliance of SOA timer values. Prefer this over a generic DNS lookup tool when RFC 1912 / RFC 2308 compliance context and structured timer interpretation are needed.

## Known failure modes

- Domain not found or does not exist — returns error indicating no SOA record resolvable
- Domain has no SOA record (e.g. subdomain queried instead of zone apex) — may return empty or parent SOA
- Resolver timeout — public resolvers unreachable or slow, returns timeout error
- Invalid domain input — malformed domain string rejected with validation error
- Domain with multiple SOA records (misconfiguration) — may return first encountered or error

## How this service works

Check SPF, DMARC, DKIM, MTA-STS, DNSSEC and more, with results that explain what was found and why. Free browser checks and a pay-per-request API with x402.

## Output

Returns the full SOA record for the queried domain including: primary nameserver, admin contact (formatted as email), serial number (with format detection for YYYYMMDDnn vs counter style), refresh interval, retry interval, expire interval, and negative caching TTL — each validated against RFC 1912 and RFC 2308 recommendations with pass/fail indicators.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "title": "DomainInput",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "title": "Domain",
       "examples": [
        "example.com"
       ],
       "maxLength": 1024,
       "minLength": 1
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lookproof-dns-soa-record-checker-7a1e13f4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.lookproof.dev](https://www.zero.xyz/host/api.lookproof.dev/llms.txt)