# TD Agent Utility · Email Verification

> TD Agent Utility · Email Verification is a paid API for AI agents from tdagentutility.co.uk, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-16).

Validates an email address by checking syntax, DNS existence, MX records, disposable domain status, and mailbox existence

## Facts

- Endpoint: POST https://tdagentutility.co.uk/v1/email-verify?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/td-agent-utility-email-verification-132b4c22
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g9g0kGbl3rsV29oZZ5OXw

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 td-agent-utility-email-verification-132b4c22 -d '<json body>'
```

Example prompt: Can you verify whether the email address john.doe@example.com is valid — check if it's syntactically correct, has real DNS and MX records, isn't a disposable address, and whether the mailbox actually exists?

## When to prefer this

Choose this endpoint when you need deterministic, multi-layer email validation beyond simple regex checks — especially when you need DNS and MX record verification, disposable domain detection, and role address flagging in a single call. Prefer this over client-side validation libraries when building agent workflows that require reliable delivery confidence before sending messages or creating user accounts.

## Known failure modes

- Invalid or malformed email input returns syntactically_valid: false with FAIL status
- Unresolvable domain returns dns_exists: false
- Domain exists but has no MX records returns null_mx: true
- Mailbox existence often returns UNKNOWN when SMTP probing is blocked or unavailable
- Network timeouts during DNS or SMTP checks may result in partial results
- Disposable domain databases may have incomplete coverage for newer throwaway providers

## How this service works

Independent website and deployment verification for AI agents: HTTP, DNS, TLS and Chromium screenshot evidence. Three deterministic tools, x402 V2 Base USDC.

## Output

Returns a JSON object with: result_status (PASS/FAIL), syntactically_valid boolean, dns_exists boolean, null_mx boolean, mx_records array, disposable_domain flag, role_address boolean, mailbox_existence (UNKNOWN/EXISTS/DOES_NOT_EXIST), normalized_email, normalized_domain, checked_at timestamp, and a warnings array listing any issues detected.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tool": "email_verify",
  "null_mx": false,
  "warnings": [],
  "checked_at": "2026-10-15T00:00:00Z",
  "dns_exists": null,
  "mx_records": [],
  "role_address": false,
  "result_status": "PASS",
  "normalized_email": null,
  "disposable_domain": null,
  "mailbox_existence": "UNKNOWN",
  "normalized_domain": null,
  "syntactically_valid": false,
  "mail_infrastructure_valid": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/td-agent-utility-email-verification-132b4c22/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tdagentutility.co.uk](https://www.zero.xyz/host/tdagentutility.co.uk/llms.txt)