When choosing an online platform for buying cryptocurrencies please study the reviews of the exchanges and information about the reserves of the exchanges.
You can choose the exchanger you need using the BestChange service It contains information from a large number of exchangers and has a convenient search system. Just a few clicks and you can find an exchanger to exchange, sell, buy litecoin https://www.bestchange.com/visa-mastercard-usd-to-litecoin.html or for any other cryptocurrency.