# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from defi-yield.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 checks.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/email?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-2981faaf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b_hS8Ab-HmkfWnVSnMbES

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 defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-2981faaf
```

Example prompt: Can you check whether john.doe@tempmail.org is a real, deliverable email address — specifically whether it has valid MX records, passes SPF and DMARC, and whether it's from a disposable or burner provider?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple syntax checking — specifically when you need live DNS MX/SPF/DMARC lookups combined with disposable provider and role-account detection in a single call. Prefer it for agent-native workflows that support x402 micropayments and need per-address validation at low cost ($0.005/call).

## Known failure modes

- Invalid or malformed email input returns a syntax error response
- Domain with no DNS records may return MX lookup failure
- Temporary DNS resolution failures may cause false negatives on MX/SPF/DMARC checks
- Newly registered disposable provider domains may not yet be in the blocklist
- Payment failure via x402 results in HTTP 402 and no validation result

## 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://defi-yield.agentdiet.dev/v1/email)

## Output

Returns a structured object indicating: whether the email syntax is valid, whether the domain has live MX records (confirming the domain can receive mail), SPF and DMARC DNS record presence and content, whether the email comes from a known disposable/burner provider, and whether it is a role-based address (e.g. admin@, noreply@).

## 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/defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-2981faaf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)