I tried to make it super clear but it's not that easy but think of it as two balances, dollars and bitcoin Here's how it works: With the default settings, you start with $1000 and top up $150 every month and then you use the $1000 to buy bitcoin the first day and then you swap $5 every day, so basically every month you have a dollar balance of $150 that slowly goes down Now if you change to swap amount from $5 to $10 you'll use your monthly $150 in 15 days instead of 30, which will change your average buy price, of course after setting it higher than 150 it won't change anymore Hope it's clearer now