# Email & Domain Deliverability Check (MX, SPF, DMARC, Provider, Disposable Flag)

> Email & Domain Deliverability Check (MX, SPF, DMARC, Provider, Disposable Flag) is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).

Checks an email address or domain for deliverability signals including MX records, email provider, SPF policy, DMARC policy, and whether the domain is disposable/temporary.

## Facts

- Endpoint: POST https://twin.unykorn.org/web/email-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-domain-deliverability-check-mx-spf-dmarc-provider-disposable-flag-e728eac8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bohjkBi8M18a7ooG24Uk4

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-deliverability-check-mx-spf-dmarc-provider-disposable-flag-e728eac8 -d '<json body>'
```

Example prompt: Can you check whether user@example.com is a real, deliverable email address — I want to know if the domain has MX records, what email provider they use, whether SPF and DMARC are configured, and if it looks like a disposable/throwaway address?

## When to prefer this

Use this endpoint when you need a quick, multi-signal deliverability and authentication check for an email address or domain in a single call — covering MX, SPF, DMARC, provider identification, and disposable detection simultaneously. Prefer this over manual DNS lookups or single-purpose validators when you need a comprehensive picture of email infrastructure quality, especially for fraud detection, lead qualification, or pre-send list hygiene.

## Known failure modes

- Invalid or malformed email/domain input returns an error
- Non-existent domain with no DNS records may return empty MX/SPF/DMARC fields
- Rate limiting or payment failures result in HTTP 402 response
- Newly registered domains may have incomplete or missing DNS records
- Some privacy-protected domains may obscure provider identification

## How this service works

Email/domain deliverability check: MX, provider, SPF, DMARC policy, disposable flag — Genesis402 / UnyKorn Operator Network

## Output

Returns a structured report for the queried email or domain including: MX record presence and details, identified email provider (e.g. Google Workspace, Microsoft 365), SPF record policy, DMARC policy configuration, and a boolean flag indicating whether the domain is a known disposable/temporary email provider.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "email_or_domain": {
     "type": "string",
     "description": "required: user@domain.com or domain.com"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "email-domain-check",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.002,
   "receipt_id": "g402-<16hex>"
  },
  "sources": [
   {
    "ok": true,
    "name": "<source>"
   }
  ],
  "limitations": "<text>",
  "generated_at": "<iso time>",
  "evidence_hash": "sha256:<64hex>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-domain-deliverability-check-mx-spf-dmarc-provider-disposable-flag-e728eac8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)