Invoiced does not charge anything extra to accept online payments or add any fees to transactions. You do however still have to pay the transaction fees from the payment processor used to facilitate a payment. This fee varies between each processor.
We have partnered with a payment processor called BluePay that has arranged special pricing for U.S. based merchants using Invoiced. You can learn more here.
You can see all of the payment processors that we support here in order to find the best service and rates for your business.