# DKIM Selector ctct1 Lookup

> DKIM Selector ctct1 Lookup is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Looks up and parses the DKIM public key for the 'ctct1' selector of a given domain, reporting key type, length, testing flag, and revocation status.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/dkim/ctct1?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dkim-selector-ctct1-lookup-c71b8da0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sY1IAJUSA4H3BueiJ4laH

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-selector-ctct1-lookup-c71b8da0
```

Example prompt: Can you check if the ctct1 DKIM selector is properly set up and not revoked for example.com?

## When to prefer this

Use this endpoint when you specifically need to validate the DKIM configuration for the 'ctct1' selector, which is commonly associated with Constant Contact email marketing. Prefer this over generic DNS TXT lookups when you need structured parsing of DKIM record fields (key type, length, revocation, testing flag) rather than the raw record string.

## Known failure modes

- Domain has no ctct1 DKIM TXT record — returns not-found or empty result
- TXT record is malformed or missing required tags — parsing may be partial
- Key is revoked (empty p=) — reported as revoked, not an error
- DNS resolution failure via Cloudflare DoH — network or timeout error
- Invalid or non-existent domain input — DNS NXDOMAIN response

## How this service works

DKIM public key for selector "ctct1" of a domain: looks up ctct1._domainkey.<domain> (TXT, Cloudflare DoH) and parses v=, k=, key type, public-key length, testing flag and whether the key is revoked (empty p=). Confirms that mail signed with the ctct1 selector will verify. $0.01 per lookup.

## Output

Returns parsed details from the ctct1._domainkey.<domain> TXT record, including the DKIM version (v=), key type (k=), public key length in bits, whether the key is in testing mode, and whether the key is revoked (empty p= field). Confirms if mail signed with the ctct1 selector will successfully verify.

## 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",
     "properties": {}
    }
   },
   "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/dkim-selector-ctct1-lookup-c71b8da0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)