The transaction fees originally only used the BNB chain. After trying everything, I found that the fees on the BNB chain are the most expensive... Thanks to the responses from friends in the comments!

If you're interested, you can buy and sell tokens in the alpha section of the Binance exchange, with a loss of around 1 USD. If you mind this, don't operate; it's just a chance for airdrops and possible wallet TGE qualifications.

Please note that:

0. This is the alpha section of the Binance exchange, not the wallet alpha section.

1. The minimum value for buying/selling needs to be above 5 USD; for the Ethereum chain, it needs to be above 20 USD.

2. Transaction fees: the base chain is the cheapest, with a loss of about 0.02 USD for buying + selling; Solana is next, with a loss of about 0.09 USD for buying + buying; the BNB chain is estimated to have a loss of about 0.9 USD for buying + selling; the Ethereum chain has an estimated loss of about 0.8 USD for buying + buying;

4. It is recommended to keep a little bit of tokens and not sell them, meaning to become a net buying user, for example, keep more than 0.1 tokens. The specific amount depends on the token's unit price. For example, if the token's unit price is 0.04 and you bought 150 tokens, then you can sell 149 tokens and keep 1 token in the alpha account.

After opening the bottom "Market" menu, you can see the "alpha" section. If not, it may be that the app version is low; try updating to the latest version.