# 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/DMARC record checks to assess deliverability.

## Facts

- Endpoint: GET https://x402broker.com/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: x402broker.com
- Website: https://x402broker.com
- Canonical page: https://www.zero.xyz/c/x402broker-com-b2a-email-deliverability-mx-spf-dmarc-verifier-26fb0c1c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ugykVnDA5nDSqL6tiGroy

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-26fb0c1c
```

Example prompt: Can you check whether john.doe@techcorp.io is a real, deliverable email — I want to know if the domain has valid MX records, whether SPF and DMARC are configured, and if it looks like a disposable or role address?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple regex syntax checking — specifically when you need live DNS MX/SPF/DMARC verification combined with disposable provider and role account detection in a single API call. Prefer this over basic syntax validators when lead quality, email deliverability, or fraud prevention matters, such as during user registration, CRM enrichment, or outbound sales campaigns.

## Known failure modes

- Missing or invalid email parameter returns a validation error
- Temporarily unresolvable DNS for a legitimate domain may produce false negatives on MX/SPF/DMARC checks
- Edge-case disposable providers not in blocklist may pass as valid
- Network timeouts on DNS lookups may cause incomplete results
- Malformed email strings may return syntax failure without further DNS checks

## 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/spf-dmarc-auditor)

## Output

Returns a structured JSON object indicating whether the email has valid syntax, whether the domain belongs to a known disposable or burner provider, whether it is a role account, and the live DNS lookup results for MX records (mail server availability), SPF record presence and validity, and DMARC policy configuration — giving a comprehensive deliverability and trustworthiness 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-26fb0c1c/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)