I wanna know that is there any platform where after depositing BitcoinBTC it can be automatically converted to on others currency (specially in stable coin).
Such platform usually have full control over your coin and most of them offer conversion to fiat (rather than altcoin). If you're looking for non-custodial platform, usually you need to make some manual configuration or even host it by yourself. Anyway you can
https://github.com/alexk111/awesome-bitcoin-payment-processors to see which one suitable for you.
Connect with me on Telegram, and I will offer you resources, for free, on all you need to know about Bitcoin and other Crypto. @ElevatedWarrior
Op doesn't have to contact you privately to be able to use payment processors, there are so many of them that they could choose from in
threads that have been created on the forum already. Can you post some of the resources you want to show to the op here, so we could also know about them.
User @Techdev is known to promote his service on many boards. You might want to click "Ignore" button in this case.