# GeekVault Email Auth Check (SPF/DMARC Lookup)

> GeekVault Email Auth Check (SPF/DMARC Lookup) is a paid API for AI agents from api.geekvault.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Checks a domain's email authentication records (SPF and DMARC) to assess its email security configuration.

## Facts

- Endpoint: GET https://api.geekvault.dev/net-tools/v1/email-auth-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/geekvault-email-auth-check-spf-dmarc-lookup-a2a752ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Oy2QIWBJKUHcPDCC1LAk9

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 geekvault-email-auth-check-spf-dmarc-lookup-a2a752ac
```

Example prompt: Can you check whether example.com has SPF and DMARC records set up for email authentication?

## When to prefer this

Use this endpoint when you need a quick, no-signup DNS lookup for SPF and DMARC records on any domain, particularly for email security auditing, deliverability checks, or anti-spoofing validation. It is ideal for agents that need frictionless per-call access without managing API keys. Prefer this over manual DNS lookup tools when you want a structured JSON response with a plain-language note.

## Known failure modes

- Domain does not exist — returns null SPF and DMARC with an explanatory note
- DNS timeout or resolution failure — may return error or empty records
- Invalid host format provided — likely 400 or error note
- Domain has no email authentication records at all — returns nulls with note indicating missing configuration
- Payment not provided or insufficient USDC — 402 Payment Required response

## How this service works

Network, docs, image, web, and dev utility tools paid per call via x402. No signup, no API keys, no subscriptions — just USDC on Base.

## Output

Returns the queried host, the SPF record string (or null if absent), the DMARC record string (or null if absent), and a human-readable note summarizing the authentication status of the domain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "host"
 ],
 "properties": {
  "host": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "host",
  "note"
 ],
 "properties": {
  "spf": {
   "type": [
    "string",
    "null"
   ]
  },
  "host": {
   "type": "string"
  },
  "note": {
   "type": "string"
  },
  "dmarc": {
   "type": [
    "string",
    "null"
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/geekvault-email-auth-check-spf-dmarc-lookup-a2a752ac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.geekvault.dev](https://www.zero.xyz/host/api.geekvault.dev/llms.txt)