# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from x402-audit.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown.

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

## Facts

- Endpoint: POST https://x402-audit.agentdiet.dev/v1/email-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Activations on Zero: 0
- Provider: x402-audit.agentdiet.dev
- Website: https://x402-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-6c34d568
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ie94XSh8mp9Pz5S-O3KK8

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 x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-6c34d568 -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email check in a single call — combining syntax, disposable-provider detection, role-account identification, and live DNS MX/SPF/DMARC lookup — rather than a simple format-only validator. Particularly useful for SaaS signup flows, B2B lead enrichment, pre-send email list hygiene, or anti-fraud pipelines where knowing whether an email domain is actually configured to receive mail is critical.

## Known failure modes

- Invalid or malformed email string returns a syntax validation error
- DNS lookup timeout if the domain's nameservers are slow or unreachable
- Unknown or newly registered domains may lack MX/SPF/DMARC records resulting in missing-record flags
- Payment failure via x402 if insufficient USDC balance, blocking the request
- Rate limiting if too many requests are sent in rapid succession

## 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://x402-audit.agentdiet.dev/v1/email-check)

## Output

Returns a structured object indicating whether the email address passes syntax checks, whether the domain has live MX records (confirming it can receive mail), SPF and DMARC record presence/validity, whether the provider is a known disposable/burner service, and whether the address appears to be a role account (e.g. info@, admin@, support@).

## 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/x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-6c34d568/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-audit.agentdiet.dev](https://www.zero.xyz/host/x402-audit.agentdiet.dev/llms.txt)