# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from x402broker.com, 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 checks.

## Facts

- Endpoint: GET https://x402broker.com/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402broker.com
- Website: https://x402broker.com
- Canonical page: https://www.zero.xyz/c/x402broker-com-b2a-email-deliverability-mx-spf-dmarc-verifier-28e27fc9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f_XPScMJXnjBx6hXJOMMq

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 x402broker-com-b2a-email-deliverability-mx-spf-dmarc-verifier-28e27fc9
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email deliverability check that combines syntax validation, disposable/burner detection, role account flagging, and live DNS MX/SPF/DMARC verification in a single call — especially useful for B2B lead qualification, fraud prevention at signup, or pre-campaign email list hygiene. Prefer this over simple format-only validators when you need live DNS confirmation that the domain can actually receive mail.

## Known failure modes

- Invalid or malformed email format returns a syntax error flag
- Domain does not exist or has no DNS records, resulting in MX lookup failure
- Temporary DNS resolution timeout may return inconclusive MX status
- Disposable provider list may not include newly created throwaway domains
- Payment required error (HTTP 402) if x402 payment is not attached or fails

## 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://x402broker.com/v1/mx-deliverability-verifier)

## Output

Returns a structured object covering: email syntax validity, whether the domain is a known disposable/burner provider, whether it is a role-based address (e.g. info@, admin@), live MX record lookup results indicating whether the domain can receive mail, SPF record presence and content, and DMARC policy record status — giving an overall deliverability 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"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402broker-com-b2a-email-deliverability-mx-spf-dmarc-verifier-28e27fc9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)