curl --request POST \
  --url https://api.acedata.cloud/v1/messages/count_tokens \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "claude-sonnet-4-6",
  "messages": [
    {
      "content": "<string>"
    }
  ]
}
'

{
  "input_tokens": 123
}