Dear Dev
Buy and Sell Grin through wallets and send to others wallets
This idea is implemented by Chigari App which is coin Gari network (GARI) listed in like OKX exchanges
they as short video app where can buy GARI coins directly and use in app or send to someone and sell directly .
why cant be implement in our GRIN wallets
dear dev please try to develop like this features and lets increase use more case of GRIN 
not like exchange trading transactions done , buying or selling done at wallets must be go through chain and as to complete after confirmations
this will increase usebility like more than fiat
If you mean buying with fiat, then I can’t see that working. Fiat is a closed loop system that needs trust to work. Atomic swaps built into wallets is a great idea though. So it could be a bitcoin or monero wallet as well as grin and you can transact with others in the wallet itself.