# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from whale-momentum.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://whale-momentum.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0806e1c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J13r2a_zamCK1RK0UMDOw

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 whale-momentum-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0806e1c7 -d '<json body>'
```

Example prompt: Can you verify whether john.doe@acmecorp.com is a real, deliverable email — check its MX records, whether the domain has SPF and DMARC set up, and flag it if it's a disposable or role account?

## When to prefer this

Choose this endpoint when you need a single, comprehensive email health check that combines syntax validation, disposable provider detection, role account flagging, and live DNS MX/SPF/DMARC verification in one call. Prefer it over simple regex validators when you need real deliverability confidence, and over domain-only DNS tools when the unit of analysis is a full email address rather than just a domain. Particularly useful in B2B lead enrichment, signup fraud prevention, and pre-send email campaign hygiene workflows.

## Known failure modes

- Malformed or empty email input returns a validation error
- DNS lookup timeouts if the domain's nameservers are slow or unreachable
- Unknown or newly registered domains may lack MX/SPF/DMARC records, returning empty results rather than errors
- Payment failure via x402 if the calling agent lacks sufficient USDC balance
- Rate limiting or idempotency key conflicts if the same key is reused across different requests

## 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://whale-momentum.agentdiet.dev/v1/spf-dmarc-auditor)

## Output

Returns a structured report indicating whether the email address passes syntax checks, whether the domain has live MX records (and which servers), whether SPF and DMARC DNS records exist and their contents, whether the provider is a known disposable/burner service, and whether the local part matches common role account patterns (e.g. info@, admin@, support@).

## 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/whale-momentum-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0806e1c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)