# DKIM Selector ctct2 Lookup

> DKIM Selector ctct2 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 'ctct2' selector (used by Constant Contact) of a given domain via Cloudflare DNS-over-HTTPS

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/dkim/ctct2?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-ctct2-lookup-0b3221bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yXgnQaRxQZyvKVJ9-_8Yu

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-ctct2-lookup-0b3221bd
```

Example prompt: Can you check whether the DKIM ctct2 selector is properly configured for acme.com — I want to know if the public key is valid, what type and length it is, and whether it's been revoked?

## When to prefer this

Use this endpoint when you specifically need to verify the 'ctct2' DKIM selector, which is the selector used by Constant Contact for customer email sending. Choose this over generic DNS TXT lookup tools because it parses and interprets all DKIM record fields (key type, length, revocation status, testing flag) rather than returning raw DNS data. Ideal for email deliverability audits, Constant Contact integration checks, or automated monitoring of DKIM health.

## Known failure modes

- Domain has no ctct2._domainkey TXT record — returns record not found
- DNS resolution failure via Cloudflare DoH — network or upstream error
- Malformed DKIM TXT record that cannot be parsed — parse error returned
- Domain itself does not exist — NXDOMAIN response
- Key is present but revoked (empty p=) — reported as revoked rather than valid

## How this service works

DKIM public key for selector "ctct2" of a domain: looks up ctct2._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 ctct2 selector will verify. $0.01 per lookup.

## Output

Returns parsed details from the ctct2._domainkey.<domain> TXT record including: DKIM version (v=), key type (k=), public key length in bits, whether the key is revoked (empty p= field), and whether the domain is in testing mode. Confirms whether mail signed with the ctct2 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-ctct2-lookup-0b3221bd/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)