# Function spending controls

> Review Function usage, manage warm workers and handle insufficient credit.

Source: https://www.nodus-compute.ai/docs/guides/functions/billing/
Build revision: 4ebfc6023eeed1bd55d9969af1612182a7b0c7ff

Review your Function’s estimate before deploying. Use [scaling settings](https://www.nodus-compute.ai/docs/guides/functions/scaling/) to control how many workers stay active, and inspect [usage records](https://www.nodus-compute.ai/docs/guides/billing/usage-and-costs/) to review spending.

## Spending limits

A Function does not take a spend cap yet: setting `max_cost` is refused when you deploy, so no cap can be set and silently ignored. Your credit balance is the limit on what its workers spend, and `min_workers` keeps workers active until you stop the Function.

When your balance cannot cover another renewal, the workers drain inside the reserve and the Function scales to zero. New calls queue and show `Funded=False` on the Function. Add credit and the Function starts workers again for the calls that waited. Nothing the calls were doing is lost: a call whose worker drained finishes first, and one that could not finish goes back to the queue.