re: "It seems some sort of fraud from the client's side. As, he explained to me his requirements already!"
There are two possibilities:
1) This client is an honest, good person, but he is new to Upwork, and he does not know how to use it properly. He may indeed click the Hire button, set up a contract and pay you.
2) This client is dishonest. He knows how Upwork works, and he is intentionally tricking newbies into working for free.
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