Curly braces inside URI request

I have an api uri something like …/api/search/findTimeseries?filter={filter}"
When I am passing values of filter as expected by api inside {…}, I am getting “400 Bad request: Your browser sent an invalid request.”

How to use such uri’s in katalon.

....../api/search/findTimeseries?filter=%7Bfilter%7D

You should study about the concept of URL encoding. Read the following resource for example: