# Email Address Verification

> Email Address Verification is a paid API for AI agents from x402-agent-api.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Validates an email address by checking syntax, domain MX records, SPF/DMARC setup, disposable/role/free-provider flags, and mailbox deliverability, returning a scored verdict

## Facts

- Endpoint: POST https://x402-agent-api.onrender.com/api/v1/email-verify?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-address-verification-8bde7233
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jZjCJDslBT1KJCbbLXrBn

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 email-address-verification-8bde7233 -d '<json body>'
```

Example prompt: Can you verify whether jane.doe@acme.com is a real, deliverable email address — check if the domain has proper MX records, whether it's disposable or a role account, and give me an overall deliverability verdict?

## When to prefer this

Choose this endpoint when you need a multi-signal email deliverability check beyond simple regex validation — especially for lead enrichment, sign-up fraud prevention, or pre-send bounce reduction. It combines DNS (MX, SPF, DMARC), domain reputation (disposable, free provider, role account), and optional SMTP mailbox probing in a single call with no API key required. Prefer it over basic syntax validators when you need a scored verdict with actionable reasons.

## Known failure modes

- Invalid or unparseable email syntax returns syntax_valid: false with undeliverable verdict
- Domain with null MX record returns null_mx: true and undeliverable verdict
- SMTP timeout or rate-limiting by remote mail server may leave mailbox_checked: false
- Disposable email domains flagged as undeliverable or risky
- Network issues reaching DNS resolvers may cause incomplete checks
- Emails with very long local parts or unusual Unicode may fail maxLength/minLength validation

## How this service works

Is this email address real and safe to send to? Checks syntax, MX records (and null MX), disposable providers, free webmail, role accounts (info@, support@), likely typos of big providers with a suggestion (gmial.com to gmail.com), SPF and DMARC. Returns deliverable / risky / undeliverable, a 0-100 score and reasons. No mail is sent. $0.002 USDC per call.

## Output

A JSON object with: the normalized email and domain, a numeric score (0–100) representing deliverability confidence, a verdict string (e.g. 'deliverable', 'undeliverable', 'risky'), a checks object with boolean flags for SPF, DMARC, null MX, disposable, accepts_mail, role_account, syntax_valid, domain_has_mx, free_provider, an array of reason objects explaining failures, a list of MX hosts, whether a mailbox SMTP check was performed, the detected email provider, and an optional typo/domain correction suggestion.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "maxLength": 320,
   "minLength": 3,
   "description": "The address to check, e.g. \"jane@acme.com\" (a \"Jane Doe <jane@acme.com>\" form is accepted)."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "email": "jane.doe@example.com",
  "score": 0,
  "checks": {
   "spf": true,
   "dmarc": true,
   "null_mx": true,
   "disposable": false,
   "accepts_mail": false,
   "role_account": false,
   "syntax_valid": true,
   "domain_has_mx": false,
   "free_provider": false
  },
  "domain": "example.com",
  "reasons": [
   {
    "code": "null_mx",
    "message": "The domain publishes a null MX: it accepts no email."
   }
  ],
  "verdict": "undeliverable",
  "mx_hosts": [],
  "local_part": "jane.doe",
  "next_calls": [],
  "suggestion": null,
  "email_provider": null,
  "mailbox_checked": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-address-verification-8bde7233/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent-api.onrender.com](https://www.zero.xyz/host/x402-agent-api.onrender.com/llms.txt)