We support Maidsafe in two ways. One, is if you have it at an exchange such as MasterXchange (and soon to be Poloniex), We pick up the balances through their API. The second way is if you keep them in a wallet, you’ll register the wallet in our system, and add the address and balance. Then we’ll calculate the value based on the market value of the coin. For some of the more active coins, we read balances and transactions off of the blockchain.