API request error 500

Hello, this is request:
I have got error 500. same request worked OK few hours ago.

https://prnt.sc/1sch1hz - screenshot of Admin area request with same error.
What happened here? How can we fix it?

Well, I gave it a shot and tested again from my side and it works -

Could you let us know when you did the API call so that we can check from our side?

problem appeared like 15 min before I post that issue and gone in 1 hour approximately.
problem gone without any moves from my side.
yes, currently it works, thank you.