I have an arbitrary address. How can I get the current balance of the account through a Web API? ... how do I get it for a local API?
I'm also interested in all transaction history for that address. Let me know if the API can offer that as well.
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You can query the unspent outputs of an address with this:
You can get the transaction history for an address with this:
For more information see http://blockchain.info/api/blockchain_api