# Get an API

`GET /v1/apis/{api_id}` · permission `apis:read`

Returns one API. The `ETag` response header holds the current version for use in `If-Match`. An API of another environment, a deleted API and a malformed id all return `404`.

## Request

| Parameter | In | Description |
|---|---|---|
| `api_id` | path | The API id, `api_…`. |

## Response

`200 OK` with an `ETag` header:

```json
{
  "id": "api_01h455vb4pex5vsknk084sn02q",
  "key": "orders",
  "identifier": "https://api.example.com/orders",
  "name": "Orders API",
  "is_system": false,
  "access_token_lifetime_s": 3600,
  "token_format": "jwt",
  "rbac_mode": "off",
  "allow_offline_access": true,
  "require_resource_indicator": false,
  "dpop_required": false,
  "mcp_profile": false,
  "first_party_access": "all",
  "introspection_applications": ["app_01h455vb4pex5vsknk084sn02r"],
  "created_at": "2026-10-05T12:00:00Z",
  "updated_at": "2026-10-05T12:00:00Z"
}
```

`introspection_applications` lists the applications (`app_…`, in id order) that may introspect this API's tokens; when empty, only the application a token was issued to can introspect it.

## Errors

| HTTP | code | When |
|---|---|---|
| 404 | `not_found` | No such API in this environment. |
| 403 | `insufficient_permissions` | The credential lacks `apis:read`. |

## Example

```bash
curl https://api.eu.keenauth.com/v1/apis/api_01h455vb4pex5vsknk084sn02q \
  -H "Authorization: Bearer $KEENAUTH_SECRET_KEY"
```