# 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 checks.

## Facts

- Endpoint: GET https://onchain-risk.agentdiet.dev/v1/spf-dmarc-auditor?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-2a1743f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zdGqrSOFwUXQVRUVHgSHp

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-2a1743f4
```

Example prompt: Can you check whether john.doe@acmecorp.com is a real, deliverable email — specifically whether the domain has valid MX records, passes SPF and DMARC checks, and isn't a disposable or burner address?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email health check that combines syntax validation, live DNS MX/SPF/DMARC lookups, and disposable provider detection — especially useful for B2B lead validation, outreach list hygiene, or fraud prevention during user registration. Prefer this over simple regex validators when you need live DNS confirmation of deliverability.

## Known failure modes

- Invalid or malformed email string returns syntax error
- Domain does not exist — MX lookup returns NXDOMAIN
- DNS timeout or lookup failure for SPF/DMARC records
- Missing required 'email' query parameter returns 400 error
- Payment required (HTTP 402) if x402 USDC payment header is absent 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/spf-dmarc-auditor)

## Output

Returns a structured object containing: email syntax validity flag, disposable/burner provider detection, role account flag (e.g. admin@, support@), live MX record lookup results, SPF record presence and content, DMARC record presence and policy, and an overall deliverability 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/onchain-risk-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-2a1743f4/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)