

The companies that using e-micropayment system are as follow:

Typically, paystone provides an inexpensive online payment method without the risk of charge backs from fraudulent credit card use. It can handle small financial transactions (micropayments) as low as $0.25 efficiently. A small business or individual now has a method of generating revenue from their website quickly, easily and inexpensively.
While payloadz is a service to sell intangible products such as software, e-books, digital art, manuals, articles and files. It is an automated delivery service. This means that seller can go on vacation without worrying about sending download links to the consumers every time a payment is made. These files can be either downloaded via hyperlink or sent via e-mail based upon seller's product. Payloadz also has an easy integration with PayPal. Payloadz services can be used depending upon seller’s sales and product’s file size.
BitPass was an online payment system for digital content and services that founded in December 2002.It allows users to deposit money in an online account. The stored value amount can be used to pay for digital content and services. In addition, BitPass maintains a partner relationship with Microsoft, PayPal, the Royal Bank of
References:
http://en.wikipedia.org/wiki/BitPass
http://www.gold-pages.net/Paystone.htm
http://en.wikipedia.org/wiki/Electronic_money