# 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 checks.

## Facts

- Endpoint: GET https://polymarket-odds.agentdiet.dev/v1/email-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-5bd4a816
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iBxmqloJBFwjz4DAhTNsu

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-5bd4a816
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email — not a disposable or burner address — and confirm its domain has valid MX, SPF, and DMARC records?

## When to prefer this

Choose this endpoint when you need a multi-signal email validation that goes beyond simple regex syntax checks — specifically when you need live DNS MX/SPF/DMARC lookups combined with disposable-provider and role-account detection in a single call. Ideal for signup fraud prevention, B2B lead qualification, or CRM hygiene workflows where email deliverability and legitimacy both matter. Prefer this over generic syntax validators when DNS-level verification and burner-email screening are both required.

## Known failure modes

- Missing or invalid email parameter returns a 400-level error
- DNS lookup timeout for obscure or unreachable domains may delay or fail MX resolution
- Disposable provider detection may miss newly created burner services not yet in blocklists
- Role-account heuristics may produce false positives for legitimate custom aliases
- Payment not fulfilled (HTTP 402) if USDC micropayment is not properly submitted

## 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/email-check)

## Output

Returns a structured object indicating whether the email address passes syntax validation, whether the domain has live MX records confirming deliverability, whether SPF and DMARC DNS records are present, whether the provider is a known disposable/burner service, and whether the address is a role-based account (e.g. info@, admin@).

## 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-5bd4a816/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)