# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from json-repair.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/DMARC record checks to assess deliverability.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: json-repair.agentdiet.dev
- Website: https://json-repair.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/json-repair-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0dcd935e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5DDtU5Y_UoJqKk0rj8Whz

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 json-repair-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0dcd935e
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether it has valid MX records, passes SPF and DMARC checks, and isn't from a disposable or burner provider?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email deliverability assessment that goes beyond simple syntax checking — specifically when you need live DNS MX/SPF/DMARC verification, disposable provider detection, and role account flagging in a single call. Ideal for pre-outreach lead validation, signup fraud prevention, and contact list hygiene workflows.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- DNS lookup timeouts may result in inconclusive MX/SPF/DMARC results
- Newly registered or very obscure domains may lack sufficient DNS data
- Disposable provider database may not cover all burner services
- Payment required (HTTP 402) if x402 micropayment not included

## 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://json-repair.agentdiet.dev/v1/mx-deliverability-verifier)

## Output

Returns a structured JSON object indicating email syntax validity, whether the domain belongs to a known disposable/burner provider, whether the address appears to be a role account (e.g. admin@, support@), 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/json-repair-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0dcd935e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from json-repair.agentdiet.dev](https://www.zero.xyz/host/json-repair.agentdiet.dev/llms.txt)