Thanks for all the responses, what I'm trying to ask was similar sites like Simplex
So what you're asking is cryptocurrency exchange like Simplex? If so, there's plenty of choice such as Binance.
Simplex homepage (
https://www.simplex.com/) also mention partner (exchange, custodial wallet, etc.) who use their service, you should look there first.
If you're not sure whether the mentioned partner is trustworthy, feel free to ask about it.