# 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 2026-10-23).

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

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/mx-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-7fef8c77
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_teaZCYaSDyW4-6LVmr2ZB

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-7fef8c77 -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email — specifically whether the domain has valid MX records, passes SPF and DMARC, and isn't a disposable or burner address?

## When to prefer this

Choose this endpoint when you need a comprehensive, live multi-signal email check — combining syntax, DNS MX/SPF/DMARC lookup, and disposable/role-account detection in a single call — rather than a static regex or basic format check. Ideal for lead enrichment pipelines, signup fraud prevention, or cold outreach hygiene where deliverability confidence is critical. Prefer this over simpler validators when DNS record verification and disposable-domain detection are both required together.

## Known failure modes

- Invalid or malformed email string returns a syntax error response
- Domain with no DNS records returns MX lookup failure
- Timeout on DNS resolution for slow or unresponsive nameservers
- Unknown or newly registered disposable domain not yet in blocklists may pass incorrectly
- Rate limiting or payment failure (HTTP 402) if USDC balance is insufficient

## 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/mx-check)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain has live MX records capable of receiving mail, whether SPF and DMARC DNS records are present and correctly configured, whether the address belongs to a known disposable/burner email provider, and whether it is a role-based account (e.g. info@, noreply@).

## 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"
  }
 }
}
```

## 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-7fef8c77/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)