Alternative to coinmarketcap - coingecko: https://www.coingecko.com/en/api

They provide free public api, so you don't need to register any accounts and get api keys. The link I included has the official API docs, it seems you will be most interested in these endpoints: .

Coingecko supports thousands of coins and tokens, so you can include much more than top 100 coins into your research, if you want to.