Re: What is the smallest amount of BTC I can transfer to my electrum wallet
⭐ Merited by Synchronice (1)
If ViaBTC doesn't allow you to withdraw that amount, it's probably because they have a min. withdrawal amount just like exchanges does.
You are right, Viabtc has a minimum withdrawal limit for coins and for Bitcoin, it is 0.001BTC which explains why OP can't able to withdraw his 0.00052172BTC.
ViaBTC minimum withdrawal limit