The basic currency is ADA. The counter currency is BTC. The ADA/BTC rate shows how many bitcoins are needed to buy one ADA. ADA is a cryptocurrency built into the Cardano platform. Created in 2015 by co-founder of Ethereum Charles Hoskinson Cardano is a decentralised public blockchain project which is fully open source. The very ADA token was released in September 2017. Bitcoin released in 2009 was the first blockchain platform and cryptocurrency. It currently boasts the biggest market cap among all the crypto coins. The ADA/BTC chart is available at Capital.com.