Altmarkets.io:

BTC: https://altmarkets.io/trading/mpcbtc
ETH: https://altmarkets.io/trading/mpceth

Guildex.io

LTC: https://guildex.io/market/LTC-MPC

Erex

BTC: https://erex.io/exchange/MPC/BTC
ETH: https://erex.io/exchange/MPC/ETH
DOGE: https://erex.io/exchange/MPC/DOGE
USDT: https://erex.io/exchange/MPC/USDT
EREX: https://erex.io/exchange/MPC/EREX