curl --request POST \
  --url https://v1.api.flux-os.com/contracts/{id}/schedules/{schedule_id}/estimated-qualities \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --header 'x-user-id: <api-key>' \
  --data '
{
  "measurement_property": "<unknown>",
  "measurement_unit": "<unknown>",
  "value": 123
}
'

{}