Your first calendar day with auto-trading on is free. No charge for that day.
If the app makes 50 or fewer trades on a given day, you owe nothing for that day.
If the app makes 51 or more trades on a given day, we charge you for that day. The amount is set so that we net one cent per trade after payment processing fees (e.g. Stripe). You pay once per day for that day's usage, not per trade at checkout.
To keep using auto-trading the next day, you pay for the previous day (only if that day had 51+ trades). The app will show you the amount and a Pay button when required.