The getbalance RPC returns the total available balance.
getbalance ( "dummy" minconf include_watchonly avoid_reuse )
*bitcoin-cli help getbalance
getbalance ( "dummy" minconf include_watchonly avoid_reuse ) Returns the total available balance. The available balance is what the wallet considers currently spendable, and is thus affected by options which limit spendability such as -spendzeroconfchange. Arguments: 1. dummy (string, optional) Remains for backward compatibility. Must be excluded or set to "*". 2. minconf (numeric, optional, default=0) Only include transactions confirmed at least this many times. 3. include_watchonly (boolean, optional, default=true for watch-only wallets, otherwise false) Also include balance in watch-only addresses (see 'importaddress') 4. avoid_reuse (boolean, optional, default=true) (only available if avoid_reuse wallet flag is set) Do not include balance in dirty outputs; addresses are considered dirty if they have previously been used in a transaction. Result: n (numeric) The total amount in BTC received for this wallet. Examples: The total amount in the wallet with 0 or more confirmations > bitcoin-cli getbalance The total amount in the wallet with at least 6 confirmations > bitcoin-cli getbalance "*" 6 As a JSON-RPC call > curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getbalance", "params": ["*", 6]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/