# Quant Agent Shop Email Authentication Check

> Quant Agent Shop Email Authentication Check is a paid API for AI agents from quantagentshop.com, paid per call via x402, $0.0013/call, status unknown (last checked 2026-10-23).

Checks a domain's email authentication setup, returning SPF, DMARC, DKIM, MX, MTA-STS, and BIMI records along with a deliverability grade and list of issues.

## Facts

- Endpoint: POST https://quantagentshop.com/v1/email-auth-check?utm_source=zero.xyz
- Price: $0.0013/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quant-agent-shop-email-authentication-check-b3a9ace9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1nXfHhA6j10r3CVPJMytH

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 quant-agent-shop-email-authentication-check-b3a9ace9 -d '<json body>'
```

Example prompt: Can you check the email authentication setup for example.com — I want to see its SPF, DMARC, DKIM, and MX records, along with an overall deliverability grade and any issues I should fix?

## When to prefer this

Use this endpoint when you need a comprehensive, single-call email authentication audit for a domain, covering SPF, DMARC, DKIM, MX, MTA-STS, and BIMI together with a graded summary and actionable issue list. Prefer it over manual DNS lookups or separate per-record tools when you want a fast, structured deliverability or spoofing-risk assessment without assembling multiple API calls.

## Known failure modes

- Invalid or non-existent domain returns an error
- Private or localhost domain names rejected
- DNS timeout or resolution failure may return partial results
- DKIM check limited to common selectors only — custom selectors may be missed
- Network errors on the provider side return a non-charged failure response

## How this service works

Email authentication check for a domain. Returns the SPF record with its DNS lookup count and all qualifier, the DMARC policy and report addresses, MX hosts, MTA-STS and BIMI records, DKIM keys found on common selectors, a grade from A to F and a list of issues. Use to diagnose deliverability or spoofing risk. DKIM is checked on common selectors only. Typical response under 1 s. Failed calls are not charged.

## Output

Returns the domain's SPF record (with DNS lookup count and all qualifiers), DMARC policy and reporting addresses, MX hosts, MTA-STS record, BIMI record, DKIM keys found on common selectors, an overall deliverability grade from A to F, and a structured list of issues or misconfigurations.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "title": "Domain",
       "maxLength": 300,
       "minLength": 1,
       "description": "Domain name, such as example.com."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "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/quant-agent-shop-email-authentication-check-b3a9ace9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quantagentshop.com](https://www.zero.xyz/host/quantagentshop.com/llms.txt)