I think Paytomat uses Ethereum Platform,
apparently I'm wrong, for the market, where can I trade Paytomat?
Not ETH, but EOS
that's why PTI tokens you can trade first of all on EOS-focused exchanges
List of exchanges is looking the following way: WhaleEx, NewDex, BigOne, Findex, Eosdaq, DEXEOS, BTEX, DeltaDEX, Codex.one, and Chaince.