I understand that COSS tokens provide a passive revenue coming from the fees paid by users on the exchange, and if I understand well the dividends are paid in the currencies which get traded on the platform? Or in COSS tokens? Moreover, to get this dividend should one keep the tokens parked in the one owns account in the exchange or in one owns wallet, like MEW?
You have both options actually. The most easy way would be to keep your COSS tokens on the exchange in your COSS wallet (there is only one, so you cant mess that one up). Each week theres a snapshot of the coss distribution (sunday eve) and then they distribute the dividends accordingly (around tuesday or wednesday). The dividend has an own tab in your coss exchange account and it will show your share. once you have accumulated enough shares of a certain coin, you can chose to distribute it to your exchange wallet for trading. For each coin you will pay distrbition transaction fee in eth because thats how tokens work. so make sure you have enough share of a coin before paying it out. you can accumulate indefinitly before paying it out.
the other option is to go on your exchange account, go to the distribution tab or whats it called, and setup your MEW account, so your distribution will be made to your MEW account. have never done that so i can not help you there. but it should be described there....