# Lookproof DMARC Spoofability Check

> Lookproof DMARC Spoofability Check is a paid API for AI agents from api.lookproof.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Returns how strongly a domain's DMARC policy asks receivers to act on mail that fails authentication, including effective policy, subdomain policy, pct, SPF all-qualifier, and plaintext gap explanations.

## Facts

- Endpoint: GET https://api.lookproof.dev/v1/mail/spoofable?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lookproof-dmarc-spoofability-check-1e9198b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OnfmFNjsAJFRQN-YF6gUj

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 lookproof-dmarc-spoofability-check-1e9198b5
```

Example prompt: Can this domain be spoofed — check paypal.com's DMARC policy and tell me whether receivers are actually being asked to reject or quarantine forged mail, or if it's just monitoring?

## When to prefer this

Use this endpoint when you need a focused, plain-language assessment of a domain's DMARC enforcement posture specifically — whether receivers are actually asked to reject or quarantine spoofed mail, and what gaps exist. Prefer it over a full mail-security report when you only need the spoofability verdict quickly and cheaply, or when explaining DMARC policy to a non-technical user.

## Known failure modes

- Domain has no DMARC record — returns none policy or an explicit 'no record' indicator
- Malformed or multiple DMARC records — may return an error or best-effort parse
- Domain does not exist in DNS — returns error or empty response
- Network/DNS resolution timeout — returns transient error
- Invalid domain input (too long, wrong format) — rejected by schema validation

## How this service works

Check SPF, DMARC, DKIM, MTA-STS, DNSSEC and more, with results that explain what was found and why. Free browser checks and a pay-per-request API with x402.

## Output

A structured response showing the domain's DMARC policy level (none/quarantine/reject), effective policy after accounting for test mode (t=y), the subdomain policy (sp=), the pct value indicating what fraction of failing mail is subject to the policy, the SPF all-qualifier, and a plain-language explanation of any gaps that leave the domain spoofable.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "title": "DomainInput",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "title": "Domain",
       "examples": [
        "example.com"
       ],
       "maxLength": 1024,
       "minLength": 1
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lookproof-dmarc-spoofability-check-1e9198b5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.lookproof.dev](https://www.zero.xyz/host/api.lookproof.dev/llms.txt)