eCash

Physically and cryptographically strong computer chip-based iButton® eCash token fits on a key ring and can virtually eliminate the frequent reissuing expense associated with smart cards.

iButton eCash tokens provide a simple, highly secure way of functioning like a small change purse for one or more applications. iButton tokens eliminate the need to carry small amounts of cash for everyday transactions like mass transit, parking meters, and fleet refueling.

All iButton eCash Tokens 

Also See

Turnkey Solutions
Third-Party Authorized Solutions Developers (ASDs)