curl --request GET \
  --url https://api.portalhq.io/api/v3/custodians/me/alerts/webhooks/external-addresses \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "cm4voycw2001f68veade3tr0i",
      "address": "0x1234567890abcdef1234567890abcdef12345678",
      "namespace": "EIP155",
      "createdAt": "2025-01-15T10:30:00.000Z",
      "updatedAt": "2025-01-15T10:30:00.000Z"
    },
    {
      "id": "cm4voycw2001f68veade3tr0j",
      "address": "ABC123def456...",
      "namespace": "SOLANA",
      "createdAt": "2025-01-16T14:00:00.000Z",
      "updatedAt": "2025-01-16T14:00:00.000Z"
    }
  ]
}