Not through notifications today: Ads Editor doesn't send automatic low balance warnings. You track balances in Account Monitor (the Monitor Balance item in the side menu), which shows Meta and Google accounts in separate tabs and refreshes every 5 minutes:

  1. Each account shows its current balance and, for prepaid accounts, an estimate of how many days the balance will last, based on the average daily spend over the last 7 days.
  2. The color shows the risk: red for a prepaid account with 3 days of balance or less, and for an account that is disabled, closed, has a pending payment or is in a grace period; yellow for a prepaid account with 4 to 7 days of balance, or with any status other than active (such as risk review); green above 7 days; gray for an account with no recent spend.
  3. The cards at the top count how many accounts are at Critical Balance and Low Balance.
  4. The Copy summary button in the account's row creates a text with the balance, average daily spend and forecast. When the forecast is under 30 days, the text also includes a top up recommendation that covers 20 more days of average spend, rounded up to a multiple of 50. It's ready to send to your client.

To keep only the accounts you follow on screen, hide the others: click the crossed-out eye icon in the account's row and confirm with Hide. To bring an account back, click Hidden on the controls bar and then Restore.