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Add custom domain

<Info>This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production.</Info>

Attaches a domain you own to the app. Nothing serves on it until you link it with Link custom domain.

Adding a domain and linking it are separate steps. DNS propagation happens outside Base44, so a linked domain can sit unverified for as long as its nameservers take. The domain's DNS has to point at Base44 before verification can pass, and the Base44 editor's domain settings show the records to set.

If a domain was released by another workspace, the call is rejected with a TXT record to publish. Publish it at the domain's DNS provider and send the same request again to prove you control the domain. A domain your own workspace released is re-added straight away.

Don't retry a request that timed out without checking first. If the domain was added, a second request is rejected as already attached, so look for it in List custom domains before you send the request again.

Adding domains is limited to 30 requests an hour per caller. Some workspaces have a different limit.

<Warning>The response includes fields beyond the ones documented here. Don't rely on undocumented response fields, as they can change at any time.</Warning>

post/api/apps/{app_id}/custom-domains

Path parameters

app_idstring required

ID of the app the domain belongs to.

ID of the app the domain belongs to.

Request body

domainstring required

The domain to add. A scheme, a trailing slash, and a leading www. are removed, and it's stored in lower case.

Example request

{
  "domain": "example.com"
}

Response

The domain, attached to the app but not yet linked.

idstring required

ID of the domain. Pass it as domain_id to the other domain endpoints.

domainstring required

The domain name, normalized to lower case with any scheme, trailing slash and leading www. removed.

app_idstring required

ID of the app the domain serves.

disabledboolean required

Whether Base44 has stopped serving the domain. A disabled domain stays attached to the app and keeps its DNS, and serves a placeholder page instead of the app.

last_status_checkstring date-time nullable

When Get custom domain status last ran for this domain, as a UTC timestamp in ISO 8601 format, or null if it never has.

redirect_target_domainstring nullable

The domain that visitors to this one are sent to with a 301 redirect. The value is null when this domain serves the app itself.

provider_idstring nullable

Names the registrar when the domain was bought through Base44's Wix flow. The value is null otherwise, which covers both a domain you own elsewhere and one bought through the Entri flow, so this isn't a purchased-versus-external signal.

Example response

{
  "id": "68b1c0d4e7b91d003c45a1f7",
  "domain": "example.com",
  "app_id": "6820f3a4e7b91d003c45a1f2",
  "last_status_check": "2026-08-15T09:10:00",
  "last_status_payload": {
    "verificationStatus": "verified"
  },
  "redirect_target_domain": "www.example.com",
  "provider_id": "wix"
}

Changes

Changed in 1 of the 14 revisions of this API.1