curl --request POST \
  --url https://api.traceloop.com/v2/evaluators/char-count/execute \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "input": {
    "text": "Hello, world! This is a sample text."
  }
}
'

{
  "char_count": 42
}