# DKIM Apollo Selector Lookup

> DKIM Apollo Selector 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 2026-10-22).

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

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/dkim/apollo?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dkim-apollo-selector-lookup-25557f2e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dlVQEQYLDT85JZ4dzUtmx

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-apollo-selector-lookup-25557f2e
```

Example prompt: Can you check the DKIM apollo selector for example.com — I want to know if the key is valid, what type and length it is, and whether it's been revoked or is in testing mode?

## When to prefer this

Choose this endpoint when you specifically need to inspect the 'apollo' DKIM selector, which is commonly used by certain email service providers. Use it over generic DNS TXT lookup endpoints because it automatically parses all DKIM-specific fields (v=, k=, key length, testing flag, revocation) rather than returning raw TXT data. Prefer it for email authentication audits, deliverability diagnostics, or security reviews targeting the apollo selector specifically.

## Known failure modes

- Domain does not have an apollo._domainkey TXT record — returns not-found or empty result
- DNS resolution failure via Cloudflare DoH — returns a network or timeout error
- Malformed TXT record that cannot be parsed — may return partial data or a parsing error
- Revoked key (empty p= field) detected — returns revoked status rather than key details
- Rate limiting or payment failure at $0.01 per call — returns 402 or payment-required error

## How this service works

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

## Output

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

## 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-apollo-selector-lookup-25557f2e/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)