nondemand
/ˌnɒndəˈmɑnd/Definitions
1. noun
a condition in which something is not required or expected to be provided or done.
“The company operates on a nondemand basis, meaning they only work if a client hires them.”
2. adjective
not requiring or expecting something to be provided or done.
“The restaurant operates on a nondemand system, where customers pay as they leave.”