# SiteCheck Web Intel DKIM Key Checker

> SiteCheck Web Intel DKIM Key Checker is a paid API for AI agents from api.webintel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).

Looks up and analyzes the DKIM public key DNS record for a given domain and selector, reporting key type, revocation status, key size, strength, and syntax validity.

## Facts

- Endpoint: GET https://api.webintel-api.workers.dev/api/security/dkim-key-checker?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-web-intel-dkim-key-checker-f69492d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HQVI2oP4UAlvYtPoN2Bm3

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 sitecheck-web-intel-dkim-key-checker-f69492d9
```

Example prompt: Can you check the DKIM public key for the selector 'k1' on domain 'mailchimp.com' — I want to know if it's revoked, what key size it uses, and whether the syntax looks correct?

## When to prefer this

Use this endpoint when you need to quickly inspect a DKIM DNS record for a specific domain and selector without setting up DNS tooling yourself. It is ideal for validating DKIM key presence, checking for revocation, and assessing cryptographic key strength (1024-bit vs 2048-bit) in automated security audits or email deliverability workflows. It handles CNAME indirection used by major ESPs, making it practical for checking third-party sending infrastructure. Prefer it over raw DNS lookups when you need parsed, interpreted output rather than raw TXT record strings.

## Known failure modes

- Domain or selector does not exist in DNS — returns not found or empty result
- DKIM record is syntactically malformed — may return a parse error or partial data
- CNAME chain deeper than one hop — only one CNAME redirect is followed
- Network or DNS resolution timeout — returns error
- Missing required query parameters (domain or selector) — returns validation error

## How this service works

Reads the DKIM public key published at <selector>._domainkey.<domain>: key type, whether it is revoked (empty p=), decoded key size in bytes and a strength hint (about 1024-bit vs 2048-bit RSA), and basic syntax (v=DKIM1). Follows one CNAME, which large providers use. Does not check a signed message.

## Output

Returns the DKIM public key record details for the given domain and selector: key type (e.g. RSA), whether the key is revoked (empty p= field), decoded key size in bytes, a human-readable strength hint (approximately 1024-bit vs 2048-bit RSA), basic DKIM syntax validity (v=DKIM1 tag check), and whether a CNAME was followed to resolve the record.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain",
      "selector"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Sending domain such as mailchimp.com (required)"
      },
      "selector": {
       "type": "string",
       "description": "DKIM selector such as k1 or google (required)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-web-intel-dkim-key-checker-f69492d9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webintel-api.workers.dev](https://www.zero.xyz/host/api.webintel-api.workers.dev/llms.txt)