Hi @yayati1079,
It is fsym and not fysm.
Make the following changes:
URL=https://min-api.cryptocompare.com/data/price?fsym=BTC&tsyms=USD
The link you have mentioned is wrong
https://min-api.cryptocompare.com/data/price?fsym=BTC&tsyms=USD,JPY,EUR
The above link is the right ones