It usually means nothing was charged: Wiro charges a task after it finishes, and only if the model finished without an error. Check the task's Status in Task History:
Queued or Running: not charged yet.
Failed: the model reported an error, so the cost is set to $0.
Cancelled: a task cancelled in the queue or killed while running is normally not charged.
Completed: a very cheap run. The Cost column is rounded to three decimals.
The exception is a realtime voice session: its turns are charged during the session and stay charged if it's killed or ends with an error, even though its Cost can then show $0.000.
The crossed-out eye icon (No output generated) doesn't settle it, because it appears on any finished task without outputs. To see what was taken from your balance, including realtime turns, open Transactions; a row's ⋮ menu shows its task ID. Details: See what a run cost.