# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from alpha-stream.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 health.

## Facts

- Endpoint: POST https://alpha-stream.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: alpha-stream.agentdiet.dev
- Website: https://alpha-stream.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/alpha-stream-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-9d1f8e14
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LrPte4p0Wr7IkFFO0Xhhd

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 alpha-stream-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-9d1f8e14 -d '<json body>'
```

Example prompt: Can you verify whether john.doe@example.com is a real, deliverable email — check its MX records, whether it's from a disposable provider, and whether the domain has proper SPF and DMARC records?

## When to prefer this

Choose this endpoint when you need a single comprehensive check covering syntax, deliverability, disposable detection, role-account flagging, and DNS authentication records (MX, SPF, DMARC) in one call. It is particularly well-suited for AI agent workflows that need to qualify leads, validate signups, or audit outbound email domains before sending — especially in pipelines that support x402 USDC micropayment. Prefer it over basic syntax-only validators when DNS-level deliverability truth matters.

## Known failure modes

- Invalid or malformed email string returns a syntax error response
- Domain does not exist in DNS — MX lookup returns empty or NXDOMAIN
- Temporary DNS resolution failures may cause intermittent lookup errors
- SPF or DMARC records absent — indicated in response flags rather than as an error
- Rate limiting or payment failure (HTTP 402) if USDC micropayment is not processed correctly

## 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://alpha-stream.agentdiet.dev/v1/mx-deliverability-verifier)

## Output

Returns a structured object indicating email syntax validity, whether the domain is from a known disposable/burner provider, whether it is a role account (e.g. admin@, support@), and live DNS lookup results for MX records (mail server existence), SPF record presence and content, and DMARC policy — giving a comprehensive deliverability picture.

## 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/alpha-stream-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-9d1f8e14/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alpha-stream.agentdiet.dev](https://www.zero.xyz/host/alpha-stream.agentdiet.dev/llms.txt)