How to get bitcoin Unconfirmed Transactions
You can use blockcypher api to check bitcoin address transaction. 

http://api.blockcypher.com/v1/btc/main/addrs/{{YOUR_ADDRESS}}

For ex : 
http://api.blockcypher.com/v1/btc/main/addrs/1DEP8i3QJCsomS4BSMY2RpU1upv62aGvhD