# 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 provider status, role-account detection, and live DNS MX, SPF, and DMARC record lookup.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/email?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-58a853bb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lBqciN8Uwpsx0ocofgYaH

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-58a853bb -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — verify the syntax, look up its MX records, and flag it if it's a disposable or role-based account?

## When to prefer this

Choose this endpoint when you need a single API call that combines email syntax checking, live DNS MX/SPF/DMARC resolution, and disposable/role-account detection together — especially in agentic workflows where reducing bounce rates, screening signups, or qualifying leads is the goal. Prefer it over standalone syntax validators when live DNS reachability is critical, and over raw DNS tools when you also need disposable-provider intelligence.

## Known failure modes

- Email address missing or malformed input returns a validation error
- Domain with no MX records flagged as undeliverable
- DNS lookup timeout for slow or unreachable nameservers
- Payment required (HTTP 402) if x402 USDC micropayment not provided
- Rate limiting if too many requests 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://serp-extract.agentdiet.dev/v1/email)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain has live MX records (deliverability), whether SPF and DMARC DNS records are configured, whether the provider is a known disposable/burner service, and whether the address is a role 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-58a853bb/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)