# 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 detection, role account identification, and live DNS MX/SPF/DMARC record lookup to confirm deliverability.

## 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-c5febe5f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QWHdjqqx7tASE23GRlluQ

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-c5febe5f
```

Example prompt: Can you check if john.doe@example.com is a real, deliverable email address — I want to know if the syntax is valid, whether the domain has proper MX records, and whether it looks like a disposable or role-based account?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email deliverability check that combines syntax validation, disposable/burner detection, role account flagging, and live DNS MX/SPF/DMARC lookup in a single call — especially useful for agent workflows handling user signups, B2B lead enrichment, or pre-campaign email list cleaning where deliverability and fraud risk both matter.

## Known failure modes

- Invalid or missing email parameter returns an error
- DNS timeout or unreachable nameserver may result in inconclusive MX/SPF/DMARC results
- Newly registered domains may not yet have propagated DNS records, causing false negatives
- Disposable provider database may lag behind newly created burner services
- Payment failure (HTTP 402) if USDC balance is insufficient

## 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 provider is a known disposable/burner service, whether the address is role-based (e.g. admin@, info@), and live DNS lookup results for MX, SPF, and DMARC records — giving a complete picture of whether the address is likely to receive email.

## 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-c5febe5f/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)