Maybe tell us about what exactly you are trying to do so we can help you better.
If it is only a matter of showing it in "bitcoin" instead of "satoshi" you can just change the format of your data right before showing it (in your interface).
There should be another source - on one page I found api of many coins besides btc, but no other configurable api for such a coin?
In the link OmegaStarScream gave, you should go to "Address balance" section (use Ctrl+F to find it) and here is the link to an example:
https://btc.blockr.io/api/v1/address/balance/198aMn6ZYAczwrE5NvNTUMyJ5qkfy4g3Hiresponse:
{"status":"success","data":{"address":"198aMn6ZYAczwrE5NvNTUMyJ5qkfy4g3Hi","balance":8000.00236957,"balance_multisig":0},"code":200,"message":""}
now deserialize this JSON and get the
balance key which is in bitcoin not satoshi.