diff --git a/client/src/integration-test/kotlin/net/corda/client/CordaRPCClientTest.kt b/client/src/integration-test/kotlin/net/corda/client/CordaRPCClientTest.kt
index db5092e396..27d3a7eb40 100644
--- a/client/src/integration-test/kotlin/net/corda/client/CordaRPCClientTest.kt
+++ b/client/src/integration-test/kotlin/net/corda/client/CordaRPCClientTest.kt
@@ -65,4 +65,14 @@ class CordaRPCClientTest : DriverBasedTest() {
         }
         println("Result: ${flowHandle.returnValue.toBlocking().first()}")
     }
+
+    @Test
+    fun `get cash balances`() {
+        println("Starting client")
+        client.start(rpcUser.username, rpcUser.password)
+        println("Creating proxy")
+        val proxy = client.proxy()
+        val cash = proxy.getCashBalances()
+        println("Cash Balances: $cash")
+    }
 }
diff --git a/core/src/main/kotlin/net/corda/core/messaging/CordaRPCOps.kt b/core/src/main/kotlin/net/corda/core/messaging/CordaRPCOps.kt
index e4d43df5d9..1f657f64de 100644
--- a/core/src/main/kotlin/net/corda/core/messaging/CordaRPCOps.kt
+++ b/core/src/main/kotlin/net/corda/core/messaging/CordaRPCOps.kt
@@ -1,5 +1,6 @@
 package net.corda.core.messaging
 
+import net.corda.core.contracts.Amount
 import net.corda.core.contracts.ContractState
 import net.corda.core.contracts.StateAndRef
 import net.corda.core.crypto.CompositeKey
@@ -15,6 +16,7 @@ import net.corda.core.transactions.SignedTransaction
 import rx.Observable
 import java.io.InputStream
 import java.time.Instant
+import java.util.*
 
 data class StateMachineInfo(
         val id: StateMachineRunId,
@@ -92,6 +94,12 @@ interface CordaRPCOps : RPCOps {
      */
     fun getVaultTransactionNotes(txnId: SecureHash): Iterable<String>
 
+    /*
+     * Returns a map of how much cash we have in each currency, ignoring details like issuer. Note: currencies for
+     * which we have no cash evaluate to null (not present in map), not 0.
+     */
+    fun getCashBalances(): Map<Currency, Amount<Currency>>
+
     /**
      * Checks whether an attachment with the given hash is stored on the node.
      */
diff --git a/node/src/main/kotlin/net/corda/node/internal/CordaRPCOpsImpl.kt b/node/src/main/kotlin/net/corda/node/internal/CordaRPCOpsImpl.kt
index b05388b5f5..ec002c245d 100644
--- a/node/src/main/kotlin/net/corda/node/internal/CordaRPCOpsImpl.kt
+++ b/node/src/main/kotlin/net/corda/node/internal/CordaRPCOpsImpl.kt
@@ -1,5 +1,6 @@
 package net.corda.node.internal
 
+import net.corda.core.contracts.Amount
 import net.corda.core.contracts.ContractState
 import net.corda.core.contracts.StateAndRef
 import net.corda.core.crypto.CompositeKey
@@ -27,6 +28,7 @@ import org.jetbrains.exposed.sql.Database
 import rx.Observable
 import java.io.InputStream
 import java.time.Instant
+import java.util.*
 
 /**
  * Server side implementations of RPCs available to MQ based client tools. Execution takes place on the server
@@ -90,6 +92,12 @@ class CordaRPCOpsImpl(
         }
     }
 
+    override fun getCashBalances(): Map<Currency, Amount<Currency>> {
+        return databaseTransaction(database) {
+            services.vaultService.cashBalances
+        }
+    }
+
     // TODO: Check that this flow is annotated as being intended for RPC invocation
     override fun <T : Any> startFlowDynamic(logicType: Class<out FlowLogic<T>>, vararg args: Any?): FlowHandle<T> {
         requirePermission(startFlowPermission(logicType))
diff --git a/node/src/main/kotlin/net/corda/node/services/messaging/RPCStructures.kt b/node/src/main/kotlin/net/corda/node/services/messaging/RPCStructures.kt
index ca2954e5cb..d3f1f98727 100644
--- a/node/src/main/kotlin/net/corda/node/services/messaging/RPCStructures.kt
+++ b/node/src/main/kotlin/net/corda/node/services/messaging/RPCStructures.kt
@@ -175,6 +175,7 @@ private class RPCKryo(observableSerializer: Serializer<Observable<Any>>? = null)
         register(UUID::class.java)
         register(UniqueIdentifier::class.java)
         register(LinkedHashSet::class.java)
+        register(HashMap::class.java)
         register(StateAndRef::class.java)
         register(setOf<Unit>().javaClass) // EmptySet
         register(StateRef::class.java)