Hello, what service should i use to estimate the proper fee value of a BCT transaction (from an exchange like Bitstamp)?
(sending it to electrum wallet)
None.
You are no in control of the fees when a service is sending those bitcoin to you.
Also it doesn't matter what type of wallet you use to receive it.
I don;t know for sure but in the past bitstamp was paying the tx fee themselves and not charging you.
Also they bundle their transactions to avoid larger fees.