The Perfect Money Python SDK by Perfect Money allows to interact with the API features of checking accounts, exchanging rates, and creating e-Vouchers. Updated new shopping carts available include Magento, ShopCMS Payment Gateway, and Zen Cart.
Dwolla is an extremely innovative Payment API and the site allows you to transfer money with one of the least payment charges. We have covered Dwolla before here. Here is an interview with Michael Schonfeld, Developer Evangelist of Dwolla API.