What are the best digital currency platforms to exchange dollars for rupees at the live exchange rate?

I am looking for the best digital currency platforms that allow me to exchange dollars for rupees at the live exchange rate. Can you recommend some reliable platforms that offer competitive rates and ensure fast and secure transactions? I want to find a platform that provides a user-friendly interface and offers a wide range of digital currencies to choose from. Additionally, it would be great if the platform has a mobile app for convenient trading on the go. Please provide me with some options and share your insights on the features and benefits of each platform.