How to get the available balance of a specific address using blockchain.info? There seem to be two calls. What's the difference between them ? I basically want to know the total amount available to spend on each address(actually on the whole wallet but there is no such api call so I have to calculate the amount from all the addresses). 


  Unspent outputs

https://blockchain.info/unspent?active=$address

  
  Multiple Addresses Allowed separated by "|"   Address can be base58
  or xpub
  
  Optional limit parameter to show n transactions e.g. &amp;limit=50
  (Default: 250, Max: 1000)
      Optional confirmations parameter to limit the minimum confirmations e.g. &amp;confirmations=6
  
  The tx hash is in reverse byte order. What this means is that in order
  to get the html transaction hash from the JSON tx hash for the
  following transaction, you need to decode the hex (using this site for
  example). This will produce a binary output, which you need to reverse
  (the last 8bits/1byte move to the front, second to last 8bits/1byte
  needs to be moved to second, etc.). Then once the reversed bytes are
  decoded, you will get the html transaction hash.

{
    "unspent_outputs":[
        {
            "tx_age":"1322659106",
            "tx_hash":"e6452a2cb71aa864aaa959e647e7a4726a22e640560f199f79b56b5502114c37",
            "tx_index":"12790219",
            "tx_output_n":"0",
            "script":"76a914641ad5051edd97029a003fe9efb29359fcee409d88ac", (Hex encoded)
            "value":"5000661330"
        }
    ]
}

  
  Balance
  
  https://blockchain.info/balance?active=$address

Multiple Addresses Allowed separated by "|"
Address can be base58 or xpub

  
  List the balance summary of each address listed.

{
    "1MDUoxL1bGvMxhuoDYx6i11ePytECAk9QK": {
        "final_balance": 0,
        "n_tx": 0,
        "total_received": 0
    },
    "15EW3AMRm2yP6LEF5YKKLYwvphy3DmMqN6": {
        "final_balance": 0,
        "n_tx": 2,
        "total_received": 310630609
    }
}
Your question:


  How to get the available balance of a specific address using blockchain.info


The description for the /balance API:


  List the balance summary of each address listed.


So use /balance.

/unspent lists all the outputs for all addresses you provide in one big list, not grouped by address. But since you're just adding them all anyway, it doesn't make much difference for you. The /balance result is shorter and simpler.


  basically want to know the total amount available to spend on each address(actually on the whole wallet but there is no such api call


Have you checked the Wallet API? "Fetching the wallet balance" looks like what you need.