# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from polymarket-odds.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 verification.

## Facts

- Endpoint: GET https://polymarket-odds.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: polymarket-odds.agentdiet.dev
- Website: https://polymarket-odds.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/polymarket-odds-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0e9be7f1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7vH663laoRaBCnDhsDojH

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 polymarket-odds-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0e9be7f1
```

Example prompt: Can you check whether john.smith@acme-corp.com is a real, deliverable email — specifically verify its MX records, SPF, DMARC, and whether it looks like a disposable or role account?

## When to prefer this

Choose this endpoint when you need a comprehensive single-call email verification covering syntax, DNS infrastructure (MX, SPF, DMARC), disposable provider detection, and role account flagging — especially in B2B lead qualification, fraud prevention at signup, or CRM data hygiene workflows. Prefer this over simple regex validators when live DNS verification and deliverability signals are required.

## Known failure modes

- Missing or invalid email parameter returns a validation error
- DNS lookup timeout if the target domain's nameservers are slow or unresponsive
- Domain does not exist — MX/SPF/DMARC checks return empty or NXDOMAIN
- Payment failure via x402 if USDC balance is insufficient
- Rate limiting if too many requests are sent in a short window
- Ambiguous results for newly registered domains with incomplete DNS propagation

## 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://polymarket-odds.agentdiet.dev/v1/mx-check)

## Output

Returns a structured object indicating whether the email passes syntax checks, whether the domain uses a known disposable/burner provider, whether the address is a role account (e.g. info@, support@), and the live DNS lookup results for MX, SPF, and DMARC records — enabling a full deliverability and fraud-risk assessment.

## 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/polymarket-odds-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-0e9be7f1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polymarket-odds.agentdiet.dev](https://www.zero.xyz/host/polymarket-odds.agentdiet.dev/llms.txt)