# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from serp-extract.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).

Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX, SPF, and DMARC record health.

## Facts

- Endpoint: GET https://serp-extract.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-81e9a233
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r9PYIWx2eZ8mRoXwnVUlT

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 serp-extract-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-81e9a233
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email — verify its MX records, whether the domain has SPF and DMARC set up, and flag it if it's a disposable or role-based address?

## When to prefer this

Choose this endpoint when you need a comprehensive, live DNS-backed email validation that covers syntax, disposable provider detection, role account identification, and full SPF/DMARC authentication record auditing in a single call — particularly in B2B lead enrichment, user onboarding fraud prevention, or pre-campaign deliverability checks. Prefer this over simple regex or syntax-only validators when you need real-time DNS verification and email authentication compliance data.

## Known failure modes

- Invalid or malformed email string returns a syntax error or invalid flag
- Domain with no MX records returns MX lookup failure or undeliverable status
- DNS timeout or unreachable nameserver may cause lookup errors
- Newly registered domains may lack SPF/DMARC records, returning absent/missing flags
- Edge-case TLDs or internationalized domain names may not be fully supported
- Rate limiting or payment failure (HTTP 402) if USDC micropayment is not processed

## How this service works

Validates email syntax, disposable/burner provider status, role accounts, and live DNS MX/SPF/DMARC records. (Live x402 v2, IETF MPP & MCP endpoint at https://serp-extract.agentdiet.dev/v1/spf-dmarc-auditor)

## Output

Returns a structured object containing: email syntax validity, whether the domain is a known disposable/burner provider, whether the address is a role account (e.g. info@, admin@), live DNS MX record presence and details, SPF record status, and DMARC policy record status — giving a comprehensive deliverability and authenticity assessment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "email"
 ],
 "properties": {
  "email": {
   "type": "string",
   "minLength": 1,
   "description": "Email address to validate for syntax, MX deliverability, and disposable risk"
  },
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/serp-extract-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-81e9a233/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)