# Free of Charge

One of the biggest obstacles to the mass adoption of Blockchain technology right now is the way it is used, which is not "user friendly" for the average user. Namely, for each interaction with the public Blockchain, the user pays "gas", that is, he has to pay for the use of the Blockchain with cryptocurrencies. Therefore, the user must keep cryptocurrencies in his web3 wallet and be familiar with their safe use. This, of course, discourages the average user from using this technology, and in the end they usually opt for less private, centralized solutions.

The DEXPIRY application uses the latest [*<mark style="color:green;">Account Abstraction</mark>*](https://docs.optimism.io/app-developers/tools/wallets/account-abstraction) technology to hide interactions with the Blockchain and allows users to use it completely free of charge. All transactions are billed in the background and exclusively from the DEXPIRY system administrator address. This principle removes the user's need to store cryptocurrencies and pay for transactions and provides the already familiar web2 experience of interacting with applications, while not compromising other benefits that come with Blockchain technology


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