Tldr : In my country, there is always a middleman .It is so rare to work for end client directly and it is very common to be fuck over by them, because they want milk you out as much as possible

Job description : Salary range from X to Y

Me : I expect 90% of Y $
HR : if you pass technical examination we can agree on this amount.

*Technical interview*
All correct answers, perfect match with stack etc.

HR calling next day:
HR: Great job on interview, but you need to lower your financial expectation to X (around 50% of Y)
Me: Why? We have spoken the other day and you said there would be no problem with the money. I nailed the interview, I don't understand why I should agree to lower wage.
HR: I know I know, but right now we cannot give more. Maybe later
Me: I am sorry, but I feel kinda cheated. For me this is red flag since I don't know what I can expect later if you are not sincere from the beginning. I won't take your offer, goodbye.