I tried mining with 4xRX480 8gb cards at arcpool.com - now they have maintenance. A small amount i mined. So i sent a small sum of 0.01 tune for coinexchange, stocks.exchange and crypto-bridge.org.
No sum was received in the account. Dev, I believe it will be soon functional currency exchange. Good luck with your project.
I use cryptobridge and stocks.exchange and all is fine there ...
Contact support of exchange, check payments on exchange.