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Which exchange is how much reliable this is another criteria for list as a exchange in coinmarketcap. Looking shit exchanges will be denied. But recently i saw a lot of thread regarding CMC manipulation they showing many fake things such as fake volume is one of them and exchange ranking. So that now a lot of people no more trust it. I think coingecko
https://www.coingecko.com/en is the best one. You can apply here to get reliable.
Getting listed on coingecko is more easy. But the problem lies with community/ users. They more prefer seeing the project on CMC.
The first think on their mind is CMC, not listed on CMC is not good. Maybe in next 2 years user will be able to see coingecko on par with CMC, but at the moment CMC still the king.