curl --request PATCH \
  --url https://api.messari.io/user-management/v1/watchlists/{id}/assets \
  --header 'Content-Type: */*' \
  --header 'X-Messari-API-Key: <api-key>' \
  --data '{
  "action": "add",
  "assetIds": [
    "<string>"
  ]
}'

{
  "data": {
    "assetIds": [
      "<string>"
    ],
    "createdAt": "2023-11-07T05:31:56Z",
    "id": "<string>",
    "title": "<string>",
    "updatedAt": "2023-11-07T05:31:56Z"
  },
  "error": "<string>"
}