# Check Domain

> Quick domain eligibility check

**Endpoint:** `POST /v1/checks/domain`  
**Access:** Public (no credentials needed)  
**MCP tool:** `check_domain`

Blocked shared providers (gmail.com…), registration, mailbox provider, DMARC/BIMI summary. Repeatable, no private data.

## cURL example

```bash
curl -X POST "https://api.verifiedinbox.ai/v1/checks/domain" \
  -H "Content-Type: application/json" \
  -d '{
    "domain": "acme.com"
  }'
```

## Request body

| Field | Type | Description |
|---|---|---|
| `domain` *(required)* | `string` | A domain, URL or email address. |

```json
{
  "domain": "acme.com"
}
```

## Responses

### 200 OK

Check result.

```json
{
  "bimi": {
    "present": true
  },
  "blocked_provider": {
    "provider": "string",
    "reason": "Updated company logo"
  },
  "checked_at": "2026-10-31T12:00:00Z",
  "dmarc": {
    "bimi_ready": true,
    "policy": "none",
    "present": true
  },
  "domain": "acme.com",
  "domain_display": "string",
  "has_mx": true,
  "input": "string",
  "is_subdomain": true,
  "mailbox_provider": {
    "id": "0192a5e0-1234-7000-8000-000000000001",
    "name": "Acme Inc."
  },
  "organizational_domain": "string",
  "registered": true,
  "summary": "string",
  "verdict": "ok",
  "website": {
    "final_url": "https://verifiedinbox.ai/verify/0192a5e0-1234-7000-8000-000000000001/domain",
    "reachable": true
  }
}
```

### 400 (invalid_request)

`invalid_request` — the request is malformed.

```json
{
  "error": {
    "code": "invalid_request",
    "message": "Please provide a valid domain name."
  }
}
```

### 422 (unprocessable)

`unprocessable` / `blocked_provider` — understood but can't be done (plain-English reason).

```json
{
  "error": {
    "code": "unprocessable",
    "message": "Shared mailbox providers like gmail.com cannot be verified."
  }
}
```

### 429 (rate_limited)

`rate_limited` — retry after `Retry-After` seconds (`details.retry_after_seconds`). `limit_reached` — a quota is used up; `details.limit` names it and `next_action` offers support.

```json
{
  "error": {
    "code": "rate_limited",
    "message": "Too many requests. Please wait a moment and try again."
  }
}
```