I speak English on C2 and am a native German speaker and as a freelancer I do translation work sometimes. But what do you mean about becoming a customer? I expect to be paid not buy from you.
I am not a seller. I am looking for a responsible Team, consisting of NATIVE SPEAKERS, who translate to their native languages. At the beginning, you must be ready to work under bounty conditions (i.e. for tokens of the project after the completion of ICO, for a fixed price or for percentage from the raised funds).