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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.
When it comes to criterias on being listed then ill say that coingecko would be a better choice and i agree on what most majority do look about CMC.
They do always look up if its listed on CMC or not and these had been always the line specially for buyers for some coins where they do ensure out if its
listed because we can see on where markets its being traded on.We cant point on what would happen on next 2 years for CMC to look like.