# AgentShelf DNS TXT DKIM ProtonMail Lookup

> AgentShelf DNS TXT DKIM ProtonMail Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-01).

Looks up the DKIM TXT DNS record for ProtonMail (protonmail._domainkey) at a given hostname

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-txt-dkim-protonmail?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-dns-txt-dkim-protonmail-lookup-c849c10d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m7o1-gUXo62gCmRSvQ_xc

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-dns-txt-dkim-protonmail-lookup-c849c10d -d '<json body>'
```

Example prompt: Look up the ProtonMail DKIM TXT DNS record for example.com — I want to see what's at protonmail._domainkey.example.com.

## When to prefer this

Use this endpoint when you specifically need to retrieve the ProtonMail DKIM TXT record (protonmail._domainkey selector) for a given hostname. Prefer the free sandbox variant (POST /v1/sandbox/dns-txt-dkim-protonmail) for testing before incurring the $0.007 USDC cost. Choose this over generic DNS lookup tools when you want a focused, pre-scoped ProtonMail DKIM query without constructing the full DNS name yourself.

## Known failure modes

- Hostname not found or does not exist — DNS NXDOMAIN response
- No TXT record present at protonmail._domainkey subdomain — record not configured
- Malformed hostname input exceeding 253 characters or invalid format
- Network timeout when querying DNS
- ProtonMail DKIM record not yet propagated — empty or stale result

## How this service works

Call when an agent needs TXT at protonmail._domainkey.{hostname}. A different selector is a different DNS name. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-dkim-protonmail first.

## Output

Returns the DNS TXT record value found at protonmail._domainkey.{hostname}, containing the ProtonMail DKIM public key or configuration string 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/agentshelf-dns-txt-dkim-protonmail-lookup-c849c10d/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)