# Delx Commerce — DNS DKIM Selector Check

> Delx Commerce — DNS DKIM Selector Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Checks whether a given DKIM selector exists and has a valid shape in DNS for a specified domain

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/dns-dkim-selector-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-dns-dkim-selector-check-2248d8a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HpM-mFMAYENcT_3l9v3Wt

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 delx-commerce-dns-dkim-selector-check-2248d8a6 -d '<json body>'
```

Example prompt: Can you check whether the DKIM selector 'mail2026' is properly set up in DNS for example.com and tell me if the record shape looks valid?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call, no-signup DKIM selector DNS check with cryptographic evidence of the result and a guarantee of no data retention. Prefer it over running your own DNS lookup when you need verifiable, auditable results for compliance or debugging purposes, especially within an automated agent workflow on Base or Solana via x402 payments.

## Known failure modes

- Domain or selector not found in DNS returns a failed status with shape_valid false
- Malformed domain or selector input may cause validation error
- DNS lookup timeout could result in an error response
- Non-existent DKIM selector returns lookup name but shape_valid false

## How this service works

Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.

## Output

Returns a JSON object containing the fully-qualified lookup name (e.g. 'mail2026._domainkey.example.com'), a boolean indicating whether the DKIM record shape is valid, a pass/fail status, and a verifiable evidence block including a SHA-256 hash of the input and a flag confirming no data was retained.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "maxLength": 8192,
   "description": "Domain supplied to DNS DKIM Selector Check; used only for this bounded calculation and processed in memory without retention."
  },
  "selector": {
   "type": "string",
   "maxLength": 8192,
   "description": "Selector supplied to DNS DKIM Selector Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "lookup_name": "mail2026._domainkey.example.com",
   "shape_valid": true
  },
  "schema": "delx/util-dns-dkim-selector-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "2ed271ad81bc9b1f625cc07ddea8ac977772c863beecee8294f8e92984db609a",
   "external_calls": 0
  },
  "operation": "web_reliability:dns_dkim_selector_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-dns-dkim-selector-check-2248d8a6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)