⚡ Charge for What People Actually Use

I want to charge based on usage but I do not want customers getting frightening bills. Build me usage billing. Keep the pricing as editable records: a plan includes a monthly allowance of the metered thing, and beyond that a rate per unit, possibly with tiers that reduce at volume. Count usage per account continuously and show the customer, inside their account, their usage so far this period, their allowance, the cost accrued beyond it, and a projection of where they will land at the current rate. Let the customer set their own spending cap, and when they approach it warn them, and when they hit it either stop the metered activity or notify me, according to a setting. Warn at thresholds I define, not only at invoicing. Add an AI agent that explains a customer bill line by line in plain language and answers why it is higher than last month. Automate the threshold warnings, a scheduled end-of-period invoice summary, and an alert to me when any account is heading for an unusually large bill. Two logins: a customer who sees only their own usage and sets their own cap, and an owner who sets pricing.