The API page mentions the "Unspent outpus" API method, but the implementation differs from the online documentation.


 - http://blockchain.info/api/blockchain_api

But it appears it is only responding properly when using $bitcoin_address not $hash_160,

Also, the example shows a trailing slash in the URL path.  There should be no trailing slash.  e.g.,   /unspent?address=   instead of  /unspent/?address=