# DKIM Default Selector DNS TXT Record Lookup

> DKIM Default Selector DNS TXT Record Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-01).

Retrieves the TXT record at default._domainkey.{hostname} to fetch the DKIM public key for the default selector of a given domain

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-txt-dkim-default?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dkim-default-selector-dns-txt-record-lookup-d7475452
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0_s2UBMghWhcX2vjzpAap

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 dkim-default-selector-dns-txt-record-lookup-d7475452 -d '<json body>'
```

Example prompt: Look up the DKIM TXT record at the default selector for the domain example.com — I need to see what public key they have published in DNS for email signing.

## When to prefer this

Use this endpoint when you specifically need the DKIM TXT record for the 'default' selector of a domain (i.e. querying default._domainkey.{hostname}). If you need a different DKIM selector, you must construct the correct DNS name manually and use a different lookup. Prefer the free sandbox variant (unpaid POST /v1/sandbox/dns-txt-dkim-default) for testing before committing the $0.008 USDC charge.

## Known failure modes

- Domain does not exist — DNS NXDOMAIN response
- No TXT record at default._domainkey.{hostname} — record not found
- Hostname exceeds 253 characters or is empty — validation error
- DNS resolution timeout or network error
- Invalid hostname format causing lookup failure

## How this service works

Call when an agent needs TXT at default._domainkey.{hostname}. A different selector is a different DNS name. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-dkim-default first.

## Output

Returns the raw DNS TXT record content found at default._domainkey.{hostname}, which contains the DKIM public key and associated policy fields (e.g. v=DKIM1; k=rsa; p=...). If no record exists, an appropriate not-found or error response is returned.

## 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/dkim-default-selector-dns-txt-record-lookup-d7475452/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)