Hello,
sometimes I see coins on coinmarketcap which shows extreme gains,
but when I look at the exchanges, the price is much lower.
For example 6 $ on Coinmarketcap and 2 $ on an exchange.
How is that possible? Is this a bug or manipulation?
This must be the case with small cap coins. Usually, the local exchanges or exchanges which have suspended withdrawal or deposit, tend to show higer prices. Coinmarketcap shows average price from all the exchanges and that's why the price sometimes seems high than actual price on international exchanges.
This was the reason for which coinmarketcap stopped showing prices from Korean exchanges where coins usually are sold on premium.