# DKIM Selector3 TXT Record Lookup

> DKIM Selector3 TXT Record Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Retrieves the DKIM TXT record at selector3._domainkey.{hostname} via DNS lookup

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-txt-dkim-selector3?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dkim-selector3-txt-record-lookup-f9ac6666
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_s2hBvSAd0W0bDYpBbzp2o

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-selector3-txt-record-lookup-f9ac6666 -d '<json body>'
```

Example prompt: Can you look up the DKIM TXT record for selector3._domainkey on example.com and tell me what it says?

## When to prefer this

Use this endpoint specifically when you need the DKIM TXT record for the selector named 'selector3'. It is a targeted DNS lookup for that exact selector subdomain. If the selector name is different (e.g. selector1, selector2, google, s1), use the corresponding endpoint for that selector. Prefer the free sandbox endpoint (/v1/sandbox/dns-txt-dkim-selector3) before paying $0.01 USDC for this production call.

## Known failure modes

- Domain does not exist — DNS NXDOMAIN response
- No TXT record found at selector3._domainkey.{hostname} — selector not configured
- hostname parameter missing or invalid (empty string or exceeds 253 characters)
- DNS timeout or resolution failure
- Malformed hostname input rejected before lookup

## How this service works

Call when an agent needs TXT at selector3._domainkey.{hostname}. A different selector is a different DNS name. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-dkim-selector3 first.

## Output

Returns the raw DNS TXT record string found at selector3._domainkey.{hostname}, typically containing the DKIM public key (p= field) and policy parameters used for email authentication verification.

## 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-selector3-txt-record-lookup-f9ac6666/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)