Yahoo! will automatically send you an email when your balance falls below $50.00. In addition, you may choose to be alerted via email when your balance falls below an amount you specify.
For example: "Alert me with an email when my account balance falls below $100.00."
To set this alert:
Setting the balance alert is particularly important if you have chosen the manual payment plan and spend more than $50 per day or do not check email daily. If you balance drops to $0, your listings will go offline.