Ethereum Smart Contracts
Blockchains are designed to process data in a way that makes the transaction immutable, to complete such a task it requires a certain amount of computer power to achieve the equations that construct smart contracts.
When purchasing an Unstoppable Domain the cost of the gas money to create the domain on the blockchain can vary and here is a guide for finding out the current fee for minting an unstoppable domain.

Ultimate Wallet Address
To be sent cryptocurrencies it requires having a wallet and every wallet has an address, this is the address that people use to send you cryptocurrency. These addresses can be hard to remember and Unstoppable domains allow for easily creating an address to receive multiple cryptocurrencies all to one easily remembered and recited name. The domains have a one time fee and once on the Ethereum blockchain they can be a permanent wallet address, updated with smart contracts
Transaction Fee's = Gas Money
All smart contracts require compute and the Unstoppable domains effectively provide DNS for cryptocurrency wallets through smart contracts. This has a transaction fee attached on top of the purchase price. This article will show how to check the price of the transaction fee without having to sign up for anything. Metamask wallet required
Metamask
Engaging with the Ethereum blockchain requires specialised tools and a popular browser extension called metamask allows sites with web3 integration way of connecting browsers to blockchains. Here is a guide on how to check the transaction fees for creating the wallet when purchasing an Unstoppable domain

Install the Metamask browser extension, for this I used the Brave browser, installing it from the extension library, having had metamask previously I used a recovery key and set a new passwork. If you’ve never had a metamask wallet before then write down the recovery phrase and store it somewhere safe
With Metamask installed go to the Unstoppable domains documentation section and in the right hand column there is an option for ‘Create a test domain’, on the following page scroll down and click on ‘Create a domain’, finally clicking on the ‘Create Domain’ button. If it doesn’t work there is probably a warning stating that a Web3 wallet hasn’t been detected. If this is the case then check Metamask is installed and working as expected
Metamask will open once the Claim Domain button is pressed and this will show the transaction fee for creating a test domain and is a good indicator of the cost involved when purchasing and configuring a custom cryptocurrency wallet address from Unstoppable Domains