# 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 health.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/disposable-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-6364f4ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Hduz7fNHSgA7ogp_a8uEC

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-6364f4ea
```

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

## When to prefer this

Choose this endpoint when you need a single, comprehensive email check that combines syntax validation, disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC verification in one call. Prefer it over simple syntax checkers when deliverability and domain authentication matter, or over manual DNS lookups when you need all checks bundled with structured output for agent consumption.

## Known failure modes

- Missing or empty email parameter returns a validation error
- Malformed email string (not in valid format) may return syntax-invalid response
- DNS lookup timeouts for domains with slow or unreachable nameservers
- Unrecognized TLDs or newly registered domains may lack MX/SPF/DMARC records
- Payment failure (HTTP 402) if USDC micropayment is not correctly attached

## 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/disposable-email)

## Output

Returns a structured JSON object indicating whether the email passes syntax validation, whether the provider is a known disposable or burner service, whether the address is a role account (e.g. admin@, noreply@), and the live DNS status of MX, SPF, and DMARC records for the domain.

## 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-6364f4ea/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)