# 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 domain status, role account detection, and live DNS MX/SPF/DMARC record presence.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/mx-check?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-d7a8b569
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hzs6rwuSsZyBjNt6eF0M3

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-d7a8b569
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple syntax checking — specifically when you need live DNS MX/SPF/DMARC lookups combined with disposable domain detection and role account flagging in a single call. Prefer it for agent workflows involving lead qualification, fraud prevention, or pre-send deliverability checks where false positives from burner addresses are costly.

## Known failure modes

- Missing or invalid email parameter returns a 400-level error
- DNS lookup timeout for obscure or newly registered domains may cause incomplete results
- Disposable provider database may not cover very new or niche throwaway services
- Domains with aggressive anti-scraping DNS may return false negatives for MX checks
- Payment not completed via x402 results in a 402 response before validation occurs

## 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-check)

## 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. info@, admin@), live DNS MX record presence and values, SPF record existence and content, and DMARC record existence and policy — giving a holistic deliverability verdict.

## 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-d7a8b569/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)