Hi guys 
who know a good dex and a good decentralized wallet also with reduced gas costs and where we can not only store eth and erc-20 ?
who know a good dex and a good decentralized wallet also with reduced gas costs and where we can not only store eth and erc-20 ? No single wallet can reduce network fees, all fees are based on current network fee standards, Almost all mainstream wallets currently support many token standards, such as Trust Wallet, imToken, Safepal and Atomic Wallet, you can find them on Playstore and Apps Store.
There is no apps, exchange or other think can reduce your gas cost ~XD
Exchange that reduces gas costs? You can use FTX, they don't charge any network fees to most of the chains, except for ERC20 (they will reduce fees for you, but standard network fees still apply) and Bitcoin withdrawals under 0.01 BTC.