# 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/DMARC record checks to confirm deliverability.

## Facts

- Endpoint: GET https://onchain-risk.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: 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-fcf933df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8PFcH4ka8i1wKuskLplvb

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-fcf933df
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple syntax checking — specifically when you need live DNS verification of MX, SPF, and DMARC records alongside disposable provider and role account detection in a single call. Prefer it over lightweight regex-only validators when email deliverability and fraud screening both matter, such as before sending outreach emails, onboarding new users, or enriching B2B lead data.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- DNS timeout or unreachable nameservers may cause MX/SPF/DMARC checks to fail or return inconclusive results
- Newly registered domains may not yet have propagated DNS records, leading to false negatives
- Disposable provider database may not cover every burner service, leading to missed detections
- Payment (x402) not fulfilled results in HTTP 402 response blocking the query

## 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/email)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the provider is flagged as disposable or a burner service, whether the address is a role account (e.g. info@, admin@), and the live DNS lookup results for MX, SPF, and DMARC records on the domain, collectively indicating whether the email is likely deliverable.

## 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-fcf933df/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)