Overdraft

The overdraft directive lets you instruct the Numscript interepreter that an account post-transaction balance is allowed to be less than zero.

Unbounded

The overdraft directive allows for the account to go below zero without any limit, by using the unbounded keyword:

send [USD/2 100] (
  source = @foo allowing unbounded overdraft
  destination = @bar
)

Bounded

The exact amount below zero at which the account is allowed to go can be specified by precising the up to with a monetary value:

send [USD/2 100] (
  source = @foo allowing overdraft up to [USD/2 50]
  destination = @bar
)