# Agent Utility Network Email Domain Check

> Agent Utility Network Email Domain Check is a paid API for AI agents from agent-utility-network.frosty-sound-4560.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Validates an email address's domain by checking for MX records, address records, and mailbox deliverability signals.

## Facts

- Endpoint: POST https://agent-utility-network.frosty-sound-4560.workers.dev/v1/paid/email-domain-check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-utility-network-email-domain-check-dfea4f7d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kPaP1OLaHPL8DDZGMf_Jd

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 agent-utility-network-email-domain-check-dfea4f7d -d '<json body>'
```

Example prompt: Can you check whether the email domain for john.doe@examplecorp.com is valid and actually accepts mail — I want to know if it has MX records before I add it to my outreach list.

## When to prefer this

Use this endpoint when you need a fast, low-cost programmatic check of email domain validity before sending emails, importing contact lists, or approving user signups. Prefer this over full SMTP verification when you need DNS-level checks (MX/A records) without sending a probe message. At $0.002 per call it is cost-effective for high-volume validation pipelines.

## Known failure modes

- Invalid or malformed email address returns an error
- Domain does not exist returns hasMx: false and hasAddressRecord: false
- DNS lookup timeout may result in inconclusive results
- Email string too short (under 3 chars) or too long (over 320 chars) rejected by schema validation
- Network or payment failure via x402 may cause request to not complete

## How this service works

Quality-scored paid utility APIs for AI agents over x402 on Base USDC.

## Output

Returns a JSON object indicating whether the email's domain has MX records (hasMx), has an address/A record (hasAddressRecord), whether the mailbox was verified (mailboxVerified), and the extracted domain name.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "maxLength": 320,
   "minLength": 3
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "hasMx": true,
   "domain": "example.com",
   "mailboxVerified": false,
   "hasAddressRecord": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-utility-network-email-domain-check-dfea4f7d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-utility-network.frosty-sound-4560.workers.dev](https://www.zero.xyz/host/agent-utility-network.frosty-sound-4560.workers.dev/llms.txt)