First, this isn't the right board for such questions, you should move it.
To answer your question: recently coinmarketcap has moved from public API to semi-public, meaning that you have to get an API key first, which can be bought or you can get a free version with less functionality. Read the official documentation carefully:
https://coinmarketcap.com/api/documentation/v1/#If it's all too hard for you, hire a programmer to write a script.