# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from onchain-risk.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://onchain-risk.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: onchain-risk.agentdiet.dev
- Website: https://onchain-risk.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/onchain-risk-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-69744354
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B5WqKUZVMP2F3Vw7wfgCt

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 onchain-risk-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-69744354
```

Example prompt: Can you check whether john.smith@acmecorp.com is a real, deliverable email — specifically if the domain has valid MX, SPF, and DMARC records, and whether it's a disposable or role-based address?

## When to prefer this

Choose this endpoint when you need a single-call, multi-signal email validation that covers syntax, DNS infrastructure (MX/SPF/DMARC), disposable provider detection, and role account flagging simultaneously — especially in agent or automated workflows where per-call micropayment via x402 is acceptable and you need a lightweight, real-time check without managing a separate email verification SaaS subscription.

## Known failure modes

- Invalid or malformed email address returns a syntax error or validation failure
- Domain with no MX records returns undeliverable status
- DNS lookup timeouts may cause transient failures for slow-resolving domains
- Disposable provider list may not be exhaustive, leading to some burner emails passing
- Role account detection relies on prefix matching and may miss uncommon role prefixes
- Payment required (HTTP 402) if x402 micropayment header is missing or 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://onchain-risk.agentdiet.dev/v1/mx-check)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain uses a known disposable or burner provider, whether the address is a role account (e.g. admin@, noreply@), and the live DNS lookup results for MX, SPF, and DMARC records including their presence and values.

## 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/onchain-risk-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-69744354/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from onchain-risk.agentdiet.dev](https://www.zero.xyz/host/onchain-risk.agentdiet.dev/llms.txt)