# Email Domain Verification API

> Email Domain Verification API is a paid API for AI agents from email.payapi.market, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).

Checks whether an email domain has valid MX records, is a disposable/temporary address provider, or is a free email provider, returning deliverability signals.

## Facts

- Endpoint: POST https://email.payapi.market/domain-check?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-domain-verification-api-da0ead87
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8cSLbH_dP7WjLd5A-oD_M

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-domain-verification-api-da0ead87 -d '<json body>'
```

Example prompt: Can you check whether acme.com has valid MX records and find out if it's a disposable or free email provider?

## When to prefer this

Choose this endpoint when you need a lightweight, per-domain check for email deliverability signals — specifically MX record existence, disposable provider detection, and free provider flagging — without needing to validate a specific email address syntax or perform a full SMTP handshake. Ideal for registration flows, lead qualification, or pre-send list hygiene where cost-per-check matters and you only have the domain portion of an email address.

## Known failure modes

- Domain does not exist or has no MX records — returns valid: false with empty mx_records array
- Invalid domain format submitted — may return an error or valid: false
- Network timeout reaching DNS servers — request may fail with a server error
- Rate limiting or payment failure — 402 payment required or 429 too many requests

## How this service works

Email verification with x402 payments. $0.001 per request in USDC on Base.

## Output

Returns a JSON object indicating whether the domain is valid (boolean), the domain name, whether it is a disposable/throwaway provider (boolean), a list of MX record hostnames found for the domain, and whether it is a free email provider (string or null).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "description": "Domain to check for valid MX records and disposable status, e.g. 'acme.com'."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "valid": true,
  "domain": "acme.com",
  "disposable": false,
  "mx_records": [
   "aspmx.l.google.com",
   "alt1.aspmx.l.google.com"
  ],
  "free_provider": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-domain-verification-api-da0ead87/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email.payapi.market](https://www.zero.xyz/host/email.payapi.market/llms.txt)