API Reference · Checks

Check Domain

Quick domain eligibility check

POST/v1/checks/domain

Public (no credentials needed)MCP:check_domain

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

cURL example

cURL request

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

Request body

application/json · required

Field	Type	Description
domainrequired	string	A domain, URL or email address.

Example request payload (CheckDomainRequest)

{
  "domain": "acme.com"
}

Response

200 OKCheck result.

application/json

Field	Type	Description
bimirequired	object	— Nested fields (1) `present` (boolean)
blocked_providerrequired	object \| null	— Nested fields (2) `provider` (string) `reason` (string)
checked_atrequired	string (date-time)	—
dmarcrequired	object	— Nested fields (3) `bimi_ready` (boolean) `policy` (string) `present` (boolean)
domainrequired	string	—
domain_displayrequired	string	—
has_mxrequired	boolean	—
inputrequired	string	—
is_subdomainrequired	boolean	—
mailbox_providerrequired	MailboxProvider \| null	— Nested fields (2) `id` (string) `name` (string)
organizational_domainrequired	string	—
registeredrequired	boolean	—
summaryrequired	string	One friendly sentence.
verdictrequired	string	— Allowed: `ok`, `blocked_provider`, `invalid`, `not_registered`
websiterequired	object \| null	— Nested fields (2) `final_url` (string) `reachable` (boolean)

Example 200 response (QuickCheck)

{
  "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
  }
}

Other responses & possible errors

Expand a status code below to see the error code, description, and example error payload.

400 (invalid_request)`invalid_request` — the request is malformed.

`invalid_request` — the request is malformed.

Example 400 error response

{
  "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).

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

Example 422 error response

{
  "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.

`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.

Example 429 error response

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

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