What is the maximum amount usually the settlement companies negotiate to settle?

The settlement companies usually negotiate for relatively higher amount.

There is no such cap. How much do you owe?

They can charge you based on the amount of debt you want to pay off.

Usually, there's no such cap. However, it should be such an amount that you can pay a certain percent of it. Otherwise, you'd have to file bankruptcy.

It'll depend on your total debt amount. Ofcourse..the debt settlement companies will negotiate with the creditors to get a good settlement offer, as low as possible.