# DNS TXT DomainKey Lookup

> DNS TXT DomainKey Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).

Retrieves the raw TXT DNS record at the _domainkey subdomain for a given hostname, used for DKIM email authentication lookups

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-txt-domainkey?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-txt-domainkey-lookup-55846c8e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JLJdAPvzUtTII1Dq9ErLi

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 dns-txt-domainkey-lookup-55846c8e -d '<json body>'
```

Example prompt: Can you fetch the raw _domainkey TXT DNS record for example.com so I can check its DKIM configuration?

## When to prefer this

Use this endpoint when you need the raw, unfiltered _domainkey TXT DNS record for a domain and want a simple paid API call without managing DNS resolution infrastructure. Prefer the free sandbox POST /v1/sandbox/dns-txt-domainkey endpoint first if available. Best suited for DKIM key inspection, email authentication audits, or domain configuration verification at $0.002 USDC per call.

## Known failure modes

- Domain does not have a _domainkey TXT record — returns empty or not-found result
- Hostname is malformed or exceeds 253 characters — input validation error
- DNS resolution timeout or upstream DNS failure — service error
- Selector prefix not properly formatted — may return no record

## How this service works

Call when an agent needs TXT at _domainkey, unfiltered. Selector SKUs use selector._domainkey. Send JSON {"hostname":"example.com"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/dns-txt-domainkey first.

## Output

Returns the raw, unfiltered TXT DNS record content found at the _domainkey subdomain (or selector._domainkey) of the given hostname, typically containing DKIM public key data such as v=DKIM1 key entries.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hostname": {
   "type": "string",
   "examples": [
    "example.com"
   ],
   "maxLength": 253,
   "minLength": 1,
   "description": "Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dns-txt-domainkey-lookup-55846c8e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)