# 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 (last checked 2026-10-23).

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

## Facts

- Endpoint: POST https://x402-audit.agentdiet.dev/v1/email-verify?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-c11fd23c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m-x8uplGpliWJglDpI5kz

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-c11fd23c -d '<json body>'
```

Example prompt: Can you check whether john.doe@tempmail.com is a real, deliverable email address — specifically whether it's a disposable or burner provider, a role account, and whether its domain has valid MX, SPF, and DMARC DNS records?

## When to prefer this

Choose this endpoint when you need a comprehensive, live email validation that goes beyond simple syntax checks — specifically when you need real-time DNS MX/SPF/DMARC lookups combined with disposable provider detection and role account screening in a single API call. It is particularly well-suited for agent-driven workflows that require fraud screening at signup, pre-send deliverability checks, or identity verification, and that support HTTP 402 x402 micropayment authentication with Base USDC.

## Known failure modes

- Invalid or malformed email input returns a syntax error response
- DNS lookup timeout if the domain's nameservers are unresponsive
- Unknown or newly registered domains may have incomplete DNS data
- Payment failure (HTTP 402) if x402 USDC payment is not properly attached
- Rate limiting if too many requests are made in a short window

## 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-verify)

## Output

Returns a structured object indicating: whether the email syntax is valid, whether the domain is a known disposable/burner provider, whether the address is a role account (e.g. admin@, info@, noreply@), and the live DNS lookup results for MX, SPF, and DMARC records — enabling a deliverability and fraud-risk assessment for the email address.

## 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-c11fd23c/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)