Nope. You can use those coins to avail kill the bill rewards. kill the bill rewards are the earnings which will be settled in ur credit card payment. You can earn kill the bill rewards 5 times per card on minimum transaction amount of Rs. 1000 each and you can avail it by going on the lifestyle icon.
Cred is giving Rs 100 cashback reward for securing your credit cards as per RBI new guidelines. Just pay Rs 2 to cred using your card and cred will refund that and also credit a bonus 100 rs per card in your account.