# 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 to determine real-world deliverability.

## Facts

- Endpoint: POST https://whale-momentum.agentdiet.dev/v1/disposable-email?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-a74dc0f0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EmlcfEKtUkEEHe1NL_5vb

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-a74dc0f0 -d '<json body>'
```

Example prompt: Can you check whether john.smith@example.com is a real, deliverable email address — specifically if it's from a disposable provider, passes MX/SPF/DMARC checks, and isn't a generic role account?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple syntax checking — combining disposable provider detection, role account flagging, and live DNS record verification (MX/SPF/DMARC) in a single call. Ideal for lead enrichment pipelines, sign-up fraud prevention, and pre-campaign list hygiene where deliverability confidence is critical.

## Known failure modes

- Malformed or empty email input returns a validation error
- DNS lookup timeouts may occur for domains with slow or unresponsive nameservers
- Newly registered or obscure disposable providers may not be flagged if not in the known blocklist
- Private/internal domains may not have publicly resolvable MX records, leading to false negatives
- Missing SPF or DMARC records reported as absent rather than invalid

## 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/disposable-email)

## Output

Returns a structured object indicating email syntax validity, whether the domain is a known disposable/burner provider, whether the address is a role account (e.g. admin@, info@), and live DNS lookup results for MX, SPF, and DMARC records — giving a comprehensive deliverability 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/whale-momentum-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-a74dc0f0/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)