Xapo and Coinbase are pretty much the same. For an incoming bitcoin transaction of less than 0.00042487 Xapo charges a processing fee of 0.00028325 and the current standard fee for an outgoing transaction is 0.0006409. Not suitable for accumulating microearnings. Coinpot only has around six faucets so if you are also using Faucethub faucets then withdraw your Coinpot earnings to Faucethub, accumulate, withdraw to your Bitcoin address.