AdRoll does not have a fixed commission rate on each dollar of ad spend. Instead, it typically works on a cost-per-click (CPC) or cost-per-impression (CPM) model. The pricing varies based on factors like targeting, the type of ads, and the campaign's reach. AdRoll may charge a percentage of the total ad spend or a flat fee depending on the specific services or features you use. For more precise details, you would need to review the pricing structure based on your specific campaign requirements and goals.