# AgentShelf DKIM S1 DNS TXT Lookup

> AgentShelf DKIM S1 DNS TXT Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).

Looks up the DKIM TXT record at the s1._domainkey selector for a given hostname via DNS

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-txt-dkim-s1?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-dkim-s1-dns-txt-lookup-d699c0fc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QQkb-3LxbTbh_dSTXtJU9

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 agentshelf-dkim-s1-dns-txt-lookup-d699c0fc -d '<json body>'
```

Example prompt: Look up the DKIM TXT record at the s1._domainkey selector for example.com and tell me what it contains.

## When to prefer this

Use this endpoint when you specifically need the s1 DKIM selector TXT record for a hostname and want a direct, low-cost DNS lookup without running your own resolver. Prefer the free sandbox endpoint /v1/sandbox/dns-txt-dkim-s1 first; fall back to this paid endpoint when the sandbox is unavailable or rate-limited. Do not use this for other DKIM selectors (e.g. s2, google, default) — those are different DNS names requiring different endpoints.

## Known failure modes

- Hostname does not exist in DNS — NXDOMAIN or empty response
- No TXT record at s1._domainkey for the given hostname — returns null or empty
- Invalid or malformed hostname input — validation error
- DNS timeout or resolver unavailability — network error response
- DKIM record exists under a different selector (not s1) — record not found at this path

## How this service works

Call when an agent needs TXT at s1._domainkey.{hostname}. A different selector is a different DNS name. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-dkim-s1 first.

## Output

Returns the raw DNS TXT record value found at s1._domainkey.{hostname}, typically containing the DKIM public key and policy parameters (e.g. v=DKIM1; k=rsa; p=...).

## 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/agentshelf-dkim-s1-dns-txt-lookup-d699c0fc/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)