There is no correlation between the title of your question and its content. To learn about any credit card offers, please refer to this post:
https://fincuss.com/topic/46/any-offer-on-hdfc-credit-card/2

Axis Bank , HDFC Bank offers zero-balance accounts to customers. In these banks, there is no need to maintain the minimum amount, and they have great customer service.

The Indian Income Tax Department clearly states that you must pay a 30% tax on cryptocurrency profits. There is no other way to avoid this tax.