# 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 2026-10-21).

Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX, SPF, and DMARC record presence.

## Facts

- Endpoint: GET https://whale-momentum.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-216882cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mubytOgbI1v1iW_lsPhJP

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-216882cb
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive single-call check combining syntax validation, live DNS MX lookup, SPF/DMARC authentication record auditing, and disposable/role account detection — rather than using separate tools for each concern. Ideal for B2B lead enrichment pipelines, sign-up fraud prevention, or pre-send email list hygiene where both deliverability and security posture matter.

## Known failure modes

- Missing or invalid email parameter returns a 400-level error
- DNS lookup timeout if the domain's nameservers are slow or unreachable
- False negatives on newer disposable providers not yet in the blocklist
- Role account detection may miss uncommon role prefixes
- DMARC/SPF records may be stale if DNS TTL is high
- HTTP 402 payment required if x402 micropayment is not properly attached

## 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 object indicating whether the email address passes syntax validation, whether the domain has live MX records (confirming deliverability), whether the address belongs to a known disposable or burner email provider, whether it is a role-based account (e.g. info@, support@), and whether the domain's DNS includes valid SPF and DMARC records.

## 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-216882cb/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)