Yes, me too. Pretty interesting to check what supported cryptocurrencies and if you do the design (frontend) or have already templates?
I found this article about build crypto exchnage software - http://merehead.com/blog/how-build-cryptocurrency-exchange-software/. A lot of things such as security, trading engine, admin system etc. and they say design is very important right now as still many users want to trade but the gap is too big

Crypto trading software is such famous and popular right now. Take a look at this article - http://merehead.com/blog/how-build-cryptocurrency-exchange-software/. Actually, building own one doesn't seem to be so hard, does it?

it is Indian based and accept INR

Listen, very common use cases are fees on 3 different ways:
- withdrawals
- transaction (golden treasure)
- deposits (rarely)

Last one is actually makes money. I had seldom seen when crypto exhcange takes fee on deposit as it out of their interests. Pretty obvious why. However to increase the amount of transaction you might allow API Source link: http://merehead.com/blog/how-build-cryptocurrency-exchange-software/

I hope that makes sense. Either way the core in volume!

I found this article very useful for me - http://merehead.com/blog/how-build-cryptocurrency-exchange-software/. The main and starting point is company registration and target countries. Choose them carefully as there are a lot of pitfalls like KYC and AML. After it, as already mentioned above you need to choose fiat currencies

Zebay is still the most popular, however the cryptocurrencies sets are too poor. I'm waiting when they introduce other especially more known currencies like Monero or Ripple

I would say that coinbase the best I ever heard and used. I have always been facing with some bad regarding kraken or poloniex. The first is buggy, sometimes is down and you can't do anything.