Abra natively supports: Bitcoin, Litecoin, Bitcoin Cash, and Ethereum
Deposits from an external cryptocurrency wallet will not show up in the Abra wallet until the transaction has at least one confirmation on its blockchain. Example, a Bitcoin transaction will need at least one confirmation on the Bitcoin blockchain before it will reflect in your wallet (LTC and ETH will also need at least one confirmation on their blockchains).
All transactions must be confirmed on its blockchain before they can be withdrawn to an external wallet/account or exchanged for another currency. Example, a Bitcoin transaction will need at least one confirmation on the Bitcoin blockchain before you can exchange or withdraw those funds.
BCH transactions will now require 15 confirmations, for more information please click, here.
Only the 'send funds' transactions between Abra users will show up instantly.