[API] Data Retrieval from Coingecko API

I want to find Market Cap data for assets like BTC, ETH, U, which include data that are not currently available on Dune (e.g. BTC Network, and off-chain U data). However, they should be easily retrieved from our partner API from Coingecko. I need this to implement my own generated index here: https://www.footprint.network/@SIGMAStandard/SIGMA-Standard