I'm ashamed to say, although I have been talking about account abstraction (AA) functions, such as gas payment, but I have always stayed at the theoretical level and have never really used it. It just so happens that Kaia's wallet also supports the function of U as gas, so let's test how effective it is. Test Preparation: -No $KAIA -Empty wallet with only $USDT. -USDT on Kaia is the genuine native USDT issued by Tether on it. It's also very easy to use, there is a button directly in the official wallet, choose to use USDT to pay the handling fee. Test results: -The balance of a single fee will be deducted from 0.00242 USDT. -The actual payment on the chain is 0.0012 Kaia, equivalent to 0.00017 USDT. It's very cheap in the EVM chain. Subsequent: Although the middleman is less than the actual U, if you want to charge more, you can charge more, anyway, it doesn't cost much, but it is convenient and trouble-free. Unexpectedly, after a while, a $Kaia actually appeared in the account, and it turned out that it even gave change, and the change was returned to 0.007 KAIA 😂. It's too intimate, can you do whatever you want with low fees? Because the concept of account abstraction itself is very abstract, I was worried about whether there would be many awkward terms, such as educating users about what a Bundler is and what is a proxy payment. But in fact, the gas payment in the abstract account is smoother than expected. Especially for public chains like Kaia, which has a large number of web2 users, this last-mile problem has really been solved in some way.