i try to find bounties which they paying with usd because i don't know about ethereum's future but i know usd very well..
If you mean USD, then it is impossible at all, and if it is USDT or TUSD, then I have not even heard of such a possibility of pay for bounty hunters. In bitcoin campaigns are sometimes paid, and in ethereum in general it is very rare. Now it is very difficult to find a normal ICO, and it is even more difficult to find payment in ethereum.