diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5d782ba257..0db9e9df3f5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 
 ### Additions and Improvements
 - Expose set finalized/safe block in plugin api BlockchainService. These method can be used by plugins to set finalized/safe block for a PoA network (such as QBFT, IBFT and Clique).[#7382](https://github.com/hyperledger/besu/pull/7382)
+- In process RPC service [#7395](https://github.com/hyperledger/besu/pull/7395)
 
 ### Bug fixes
 
@@ -44,7 +45,7 @@
 - Force bonsai-limit-trie-logs-enabled=false when sync-mode=FULL instead of startup error [#7357](https://github.com/hyperledger/besu/pull/7357)
 - `--Xbonsai-parallel-tx-processing-enabled` option enables executing transactions in parallel during block processing for Bonsai nodes
 - Reduce default trie log pruning window size from 30,000 to 5,000 [#7365](https://github.com/hyperledger/besu/pull/7365)
-- Add option `--poa-discovery-retry-bootnodes` for PoA networks to always use bootnodes during peer refresh, not just on first start [#7314](https://github.com/hyperledger/besu/pull/7314) 
+- Add option `--poa-discovery-retry-bootnodes` for PoA networks to always use bootnodes during peer refresh, not just on first start [#7314](https://github.com/hyperledger/besu/pull/7314)
 
 ### Bug fixes
 - Fix `eth_call` deserialization to correctly ignore unknown fields in the transaction object. [#7323](https://github.com/hyperledger/besu/pull/7323)
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/BesuNode.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/BesuNode.java
index 5f30941f232..1ae27d62614 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/BesuNode.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/BesuNode.java
@@ -23,6 +23,7 @@
 import org.hyperledger.besu.crypto.KeyPairUtil;
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.ethereum.api.ApiConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.ipc.JsonRpcIpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.websocket.WebSocketConfiguration;
@@ -109,6 +110,7 @@ public class BesuNode implements NodeConfiguration, RunnableNode, AutoCloseable
   private final Optional<JsonRpcConfiguration> engineRpcConfiguration;
   private final WebSocketConfiguration webSocketConfiguration;
   private final JsonRpcIpcConfiguration jsonRpcIpcConfiguration;
+  private final InProcessRpcConfiguration inProcessRpcConfiguration;
   private final MetricsConfiguration metricsConfiguration;
   private final DataStorageConfiguration dataStorageConfiguration;
   private Optional<PermissioningConfiguration> permissioningConfiguration;
@@ -143,6 +145,7 @@ public BesuNode(
       final Optional<JsonRpcConfiguration> engineRpcConfiguration,
       final WebSocketConfiguration webSocketConfiguration,
       final JsonRpcIpcConfiguration jsonRpcIpcConfiguration,
+      final InProcessRpcConfiguration inProcessRpcConfiguration,
       final MetricsConfiguration metricsConfiguration,
       final Optional<PermissioningConfiguration> permissioningConfiguration,
       final ApiConfiguration apiConfiguration,
@@ -193,6 +196,7 @@ public BesuNode(
     this.engineRpcConfiguration = engineRpcConfiguration;
     this.webSocketConfiguration = webSocketConfiguration;
     this.jsonRpcIpcConfiguration = jsonRpcIpcConfiguration;
+    this.inProcessRpcConfiguration = inProcessRpcConfiguration;
     this.metricsConfiguration = metricsConfiguration;
     this.permissioningConfiguration = permissioningConfiguration;
     this.apiConfiguration = apiConfiguration;
@@ -624,6 +628,10 @@ JsonRpcIpcConfiguration jsonRpcIpcConfiguration() {
     return jsonRpcIpcConfiguration;
   }
 
+  InProcessRpcConfiguration inProcessRpcConfiguration() {
+    return inProcessRpcConfiguration;
+  }
+
   Optional<String> wsRpcListenHost() {
     return Optional.of(webSocketConfiguration().getHost());
   }
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/ThreadBesuNodeRunner.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/ThreadBesuNodeRunner.java
index 0448d324e64..459fe49efb3 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/ThreadBesuNodeRunner.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/ThreadBesuNodeRunner.java
@@ -29,6 +29,7 @@
 import org.hyperledger.besu.ethereum.GasLimitCalculator;
 import org.hyperledger.besu.ethereum.api.ApiConfiguration;
 import org.hyperledger.besu.ethereum.api.graphql.GraphQLConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.core.ImmutableMiningParameters;
 import org.hyperledger.besu.ethereum.core.plugins.PluginConfiguration;
 import org.hyperledger.besu.ethereum.eth.EthProtocolConfiguration;
@@ -236,6 +237,8 @@ public void startNode(final BesuNode node) {
             .transactionPoolValidatorService(transactionPoolValidatorServiceImpl)
             .build();
 
+    final InProcessRpcConfiguration inProcessRpcConfiguration = node.inProcessRpcConfiguration();
+
     final int maxPeers = 25;
 
     builder
@@ -297,7 +300,8 @@ public void startNode(final BesuNode node) {
         .besuPluginContext(besuPluginContext)
         .autoLogBloomCaching(false)
         .storageProvider(storageProvider)
-        .rpcEndpointService(rpcEndpointServiceImpl);
+        .rpcEndpointService(rpcEndpointServiceImpl)
+        .inProcessRpcConfiguration(inProcessRpcConfiguration);
     node.engineRpcConfiguration().ifPresent(runnerBuilder::engineJsonRpcConfiguration);
 
     besuPluginContext.beforeExternalServices();
@@ -313,6 +317,9 @@ public void startNode(final BesuNode node) {
             besuController.getTransactionPool(),
             besuController.getSyncState(),
             besuController.getProtocolContext().getBadBlockManager()));
+
+    rpcEndpointServiceImpl.init(runner.getInProcessRpcMethods());
+
     besuPluginContext.startPlugins();
 
     runner.startEthereumMainLoop();
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfiguration.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfiguration.java
index 7bffe9d7750..c77a6c8ac7b 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfiguration.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfiguration.java
@@ -17,6 +17,7 @@
 import org.hyperledger.besu.cli.config.NetworkName;
 import org.hyperledger.besu.crypto.KeyPair;
 import org.hyperledger.besu.ethereum.api.ApiConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.ipc.JsonRpcIpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.websocket.WebSocketConfiguration;
@@ -45,6 +46,7 @@ public class BesuNodeConfiguration {
   private final Optional<JsonRpcConfiguration> engineRpcConfiguration;
   private final WebSocketConfiguration webSocketConfiguration;
   private final JsonRpcIpcConfiguration jsonRpcIpcConfiguration;
+  private final InProcessRpcConfiguration inProcessRpcConfiguration;
   private final MetricsConfiguration metricsConfiguration;
   private final Optional<PermissioningConfiguration> permissioningConfiguration;
   private final ApiConfiguration apiConfiguration;
@@ -81,6 +83,7 @@ public class BesuNodeConfiguration {
       final Optional<JsonRpcConfiguration> engineRpcConfiguration,
       final WebSocketConfiguration webSocketConfiguration,
       final JsonRpcIpcConfiguration jsonRpcIpcConfiguration,
+      final InProcessRpcConfiguration inProcessRpcConfiguration,
       final MetricsConfiguration metricsConfiguration,
       final Optional<PermissioningConfiguration> permissioningConfiguration,
       final ApiConfiguration apiConfiguration,
@@ -114,6 +117,7 @@ public class BesuNodeConfiguration {
     this.engineRpcConfiguration = engineRpcConfiguration;
     this.webSocketConfiguration = webSocketConfiguration;
     this.jsonRpcIpcConfiguration = jsonRpcIpcConfiguration;
+    this.inProcessRpcConfiguration = inProcessRpcConfiguration;
     this.metricsConfiguration = metricsConfiguration;
     this.permissioningConfiguration = permissioningConfiguration;
     this.apiConfiguration = apiConfiguration;
@@ -171,6 +175,10 @@ public JsonRpcIpcConfiguration getJsonRpcIpcConfiguration() {
     return jsonRpcIpcConfiguration;
   }
 
+  public InProcessRpcConfiguration getInProcessRpcConfiguration() {
+    return inProcessRpcConfiguration;
+  }
+
   public MetricsConfiguration getMetricsConfiguration() {
     return metricsConfiguration;
   }
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfigurationBuilder.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfigurationBuilder.java
index 86fb8ab5caf..d8b5e0f9040 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfigurationBuilder.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeConfigurationBuilder.java
@@ -24,6 +24,8 @@
 import org.hyperledger.besu.crypto.KeyPair;
 import org.hyperledger.besu.ethereum.api.ApiConfiguration;
 import org.hyperledger.besu.ethereum.api.ImmutableApiConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.ImmutableInProcessRpcConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.RpcApis;
 import org.hyperledger.besu.ethereum.api.jsonrpc.authentication.JwtAlgorithm;
@@ -70,6 +72,8 @@ public class BesuNodeConfigurationBuilder {
   private JsonRpcConfiguration engineRpcConfiguration = JsonRpcConfiguration.createEngineDefault();
   private WebSocketConfiguration webSocketConfiguration = WebSocketConfiguration.createDefault();
   private JsonRpcIpcConfiguration jsonRpcIpcConfiguration = new JsonRpcIpcConfiguration();
+  private InProcessRpcConfiguration inProcessRpcConfiguration =
+      ImmutableInProcessRpcConfiguration.builder().build();
   private MetricsConfiguration metricsConfiguration = MetricsConfiguration.builder().build();
   private Optional<PermissioningConfiguration> permissioningConfiguration = Optional.empty();
   private ApiConfiguration apiConfiguration = ImmutableApiConfiguration.builder().build();
@@ -258,6 +262,12 @@ public BesuNodeConfigurationBuilder jsonRpcIpcConfiguration(
     return this;
   }
 
+  public BesuNodeConfigurationBuilder inProcessRpcConfiguration(
+      final InProcessRpcConfiguration inProcessRpcConfiguration) {
+    this.inProcessRpcConfiguration = inProcessRpcConfiguration;
+    return this;
+  }
+
   public BesuNodeConfigurationBuilder metricsConfiguration(
       final MetricsConfiguration metricsConfiguration) {
     this.metricsConfiguration = metricsConfiguration;
@@ -516,6 +526,7 @@ public BesuNodeConfiguration build() {
         Optional.of(engineRpcConfiguration),
         webSocketConfiguration,
         jsonRpcIpcConfiguration,
+        inProcessRpcConfiguration,
         metricsConfiguration,
         permissioningConfiguration,
         apiConfiguration,
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeFactory.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeFactory.java
index 1ea29388bd5..ed4a28422dd 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeFactory.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/BesuNodeFactory.java
@@ -16,6 +16,8 @@
 
 import static java.util.Arrays.asList;
 import static java.util.stream.Collectors.toList;
+import static org.hyperledger.besu.ethereum.api.jsonrpc.RpcApis.ADMIN;
+import static org.hyperledger.besu.ethereum.api.jsonrpc.RpcApis.IBFT;
 
 import org.hyperledger.besu.crypto.KeyPair;
 import org.hyperledger.besu.datatypes.Wei;
@@ -43,6 +45,7 @@
 import java.net.URISyntaxException;
 import java.nio.file.Paths;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
@@ -64,6 +67,7 @@ public BesuNode create(final BesuNodeConfiguration config) throws IOException {
         config.getEngineRpcConfiguration(),
         config.getWebSocketConfiguration(),
         config.getJsonRpcIpcConfiguration(),
+        config.getInProcessRpcConfiguration(),
         config.getMetricsConfiguration(),
         config.getPermissioningConfiguration(),
         config.getApiConfiguration(),
@@ -330,12 +334,20 @@ public BesuNode createArchiveNodeWithRpcDisabled(final String name) throws IOExc
   }
 
   public BesuNode createPluginsNode(
-      final String name, final List<String> plugins, final List<String> extraCLIOptions)
+      final String name,
+      final List<String> plugins,
+      final List<String> extraCLIOptions,
+      final String... extraRpcApis)
       throws IOException {
+
+    final List<String> enableRpcApis = new ArrayList<>(Arrays.asList(extraRpcApis));
+    enableRpcApis.addAll(List.of(IBFT.name(), ADMIN.name()));
+
     return create(
         new BesuNodeConfigurationBuilder()
             .name(name)
-            .jsonRpcConfiguration(node.createJsonRpcWithIbft2AdminEnabledConfig())
+            .jsonRpcConfiguration(
+                node.createJsonRpcWithRpcApiEnabledConfig(enableRpcApis.toArray(String[]::new)))
             .webSocketConfiguration(node.createWebSocketEnabledConfig())
             .plugins(plugins)
             .extraCLIOptions(extraCLIOptions)
@@ -394,6 +406,7 @@ public BesuNode createCliqueNodeWithExtraCliOptionsAndRpcApis(
             .miningEnabled()
             .jsonRpcConfiguration(node.createJsonRpcWithCliqueEnabledConfig(extraRpcApis))
             .webSocketConfiguration(node.createWebSocketEnabledConfig())
+            .inProcessRpcConfiguration(node.createInProcessRpcConfiguration(extraRpcApis))
             .devMode(false)
             .jsonRpcTxPool()
             .genesisConfigProvider(
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/NodeConfigurationFactory.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/NodeConfigurationFactory.java
index 219d15d1adf..c2e82c0f835 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/NodeConfigurationFactory.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/node/configuration/NodeConfigurationFactory.java
@@ -22,6 +22,8 @@
 import static org.hyperledger.besu.ethereum.api.jsonrpc.RpcApis.MINER;
 import static org.hyperledger.besu.ethereum.api.jsonrpc.RpcApis.QBFT;
 
+import org.hyperledger.besu.ethereum.api.jsonrpc.ImmutableInProcessRpcConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.websocket.WebSocketConfiguration;
 import org.hyperledger.besu.tests.acceptance.dsl.node.RunnableNode;
@@ -94,4 +96,14 @@ public JsonRpcConfiguration createJsonRpcWithRpcApiEnabledConfig(final String...
     jsonRpcConfig.setRpcApis(rpcApis);
     return jsonRpcConfig;
   }
+
+  public InProcessRpcConfiguration createInProcessRpcConfiguration(final Set<String> extraRpcApis) {
+    final Set<String> rpcApis =
+        new HashSet<>(ImmutableInProcessRpcConfiguration.DEFAULT_IN_PROCESS_RPC_APIS);
+    rpcApis.addAll(extraRpcApis);
+    return ImmutableInProcessRpcConfiguration.builder()
+        .inProcessRpcApis(rpcApis)
+        .isEnabled(true)
+        .build();
+  }
 }
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/privacy/PrivacyNode.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/privacy/PrivacyNode.java
index 32a5a0fbf4a..520cd7d5741 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/privacy/PrivacyNode.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/privacy/PrivacyNode.java
@@ -106,6 +106,7 @@ public PrivacyNode(
             besuConfig.getEngineRpcConfiguration(),
             besuConfig.getWebSocketConfiguration(),
             besuConfig.getJsonRpcIpcConfiguration(),
+            besuConfig.getInProcessRpcConfiguration(),
             besuConfig.getMetricsConfiguration(),
             besuConfig.getPermissioningConfiguration(),
             besuConfig.getApiConfiguration(),
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerGetMinGasPriceTransaction.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerGetMinGasPriceTransaction.java
new file mode 100644
index 00000000000..991e9f7bc4e
--- /dev/null
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerGetMinGasPriceTransaction.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.tests.acceptance.dsl.transaction.miner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.hyperledger.besu.tests.acceptance.dsl.transaction.NodeRequests;
+import org.hyperledger.besu.tests.acceptance.dsl.transaction.Transaction;
+
+import java.io.IOException;
+import java.math.BigInteger;
+
+import org.web3j.protocol.core.methods.response.EthGasPrice;
+
+public class MinerGetMinGasPriceTransaction implements Transaction<BigInteger> {
+
+  @Override
+  public BigInteger execute(final NodeRequests node) {
+    try {
+      final EthGasPrice result = node.miner().minerGetMinGasPrice().send();
+      assertThat(result).isNotNull();
+      assertThat(result.hasError()).isFalse();
+
+      return result.getGasPrice();
+
+    } catch (final IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+}
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerRequestFactory.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerRequestFactory.java
index 26be9d3a968..5c8b5ef6c10 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerRequestFactory.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerRequestFactory.java
@@ -16,6 +16,7 @@
 
 import org.web3j.protocol.Web3jService;
 import org.web3j.protocol.core.Request;
+import org.web3j.protocol.core.methods.response.EthGasPrice;
 
 public class MinerRequestFactory {
 
@@ -40,4 +41,8 @@ Request<?, org.web3j.protocol.core.methods.response.VoidResponse> minerStop() {
         web3jService,
         org.web3j.protocol.core.methods.response.VoidResponse.class);
   }
+
+  Request<?, EthGasPrice> minerGetMinGasPrice() {
+    return new Request<>("miner_getMinGasPrice", null, web3jService, EthGasPrice.class);
+  }
 }
diff --git a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerTransactions.java b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerTransactions.java
index e5cacd4e7a6..a8d24515a98 100644
--- a/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerTransactions.java
+++ b/acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/miner/MinerTransactions.java
@@ -23,4 +23,8 @@ public MinerStartTransaction minerStart() {
   public MinerStopTransaction minerStop() {
     return new MinerStopTransaction();
   }
+
+  public MinerGetMinGasPriceTransaction minerGetMinGasPrice() {
+    return new MinerGetMinGasPriceTransaction();
+  }
 }
diff --git a/acceptance-tests/test-plugins/src/main/java/org/hyperledger/besu/tests/acceptance/plugins/TestInProcessRpcServicePlugin.java b/acceptance-tests/test-plugins/src/main/java/org/hyperledger/besu/tests/acceptance/plugins/TestInProcessRpcServicePlugin.java
new file mode 100644
index 00000000000..3ebced0df91
--- /dev/null
+++ b/acceptance-tests/test-plugins/src/main/java/org/hyperledger/besu/tests/acceptance/plugins/TestInProcessRpcServicePlugin.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.tests.acceptance.plugins;
+
+import org.hyperledger.besu.datatypes.Wei;
+import org.hyperledger.besu.plugin.BesuContext;
+import org.hyperledger.besu.plugin.BesuPlugin;
+import org.hyperledger.besu.plugin.services.PicoCLIOptions;
+import org.hyperledger.besu.plugin.services.RpcEndpointService;
+import org.hyperledger.besu.plugin.services.rpc.RpcResponseType;
+
+import com.google.auto.service.AutoService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import picocli.CommandLine;
+
+@AutoService(BesuPlugin.class)
+public class TestInProcessRpcServicePlugin implements BesuPlugin {
+  private static final Logger LOG = LoggerFactory.getLogger(TestInProcessRpcServicePlugin.class);
+
+  private RpcEndpointService rpcEndpointService;
+
+  @CommandLine.Option(names = {"--plugin-test-set-min-gas-price"})
+  long minGasPrice = -1;
+
+  @Override
+  public void register(final BesuContext context) {
+    final PicoCLIOptions cmdlineOptions =
+        context
+            .getService(PicoCLIOptions.class)
+            .orElseThrow(
+                () ->
+                    new IllegalStateException(
+                        "Failed to obtain PicoCLI options from the BesuContext"));
+
+    cmdlineOptions.addPicoCLIOptions("test", this);
+
+    rpcEndpointService =
+        context
+            .getService(RpcEndpointService.class)
+            .orElseThrow(
+                () ->
+                    new RuntimeException(
+                        "Failed to obtain RpcEndpointService from the BesuContext."));
+  }
+
+  @Override
+  public void start() {
+    LOG.info("TestInProcessRpcServicePlugin minGasPrice option: {}", minGasPrice);
+    if (minGasPrice >= 0) {
+      callSetMinGasPrice(minGasPrice);
+    }
+  }
+
+  @Override
+  public void stop() {}
+
+  private void callSetMinGasPrice(final long minGasPrice) {
+    LOG.info("Setting minGasPrice via in-process RPC service");
+    final var minGasPriceWei = Wei.of(minGasPrice);
+    final var resp =
+        rpcEndpointService.call(
+            "miner_setMinGasPrice", new Object[] {minGasPriceWei.toShortHexString()});
+    LOG.info("miner_setMinGasPrice response: {}", resp);
+    if (!resp.getType().equals(RpcResponseType.SUCCESS)) {
+      throw new RuntimeException("Internal setMinGasPrice method failed: " + resp);
+    }
+  }
+}
diff --git a/acceptance-tests/tests/src/test/java/org/hyperledger/besu/tests/acceptance/plugins/InProcessRpcServicePluginTest.java b/acceptance-tests/tests/src/test/java/org/hyperledger/besu/tests/acceptance/plugins/InProcessRpcServicePluginTest.java
new file mode 100644
index 00000000000..4dbf8fd5d18
--- /dev/null
+++ b/acceptance-tests/tests/src/test/java/org/hyperledger/besu/tests/acceptance/plugins/InProcessRpcServicePluginTest.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.tests.acceptance.plugins;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.hyperledger.besu.tests.acceptance.dsl.AcceptanceTestBase;
+import org.hyperledger.besu.tests.acceptance.dsl.node.BesuNode;
+
+import java.math.BigInteger;
+import java.util.List;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class InProcessRpcServicePluginTest extends AcceptanceTestBase {
+  private static final long MIN_GAS_PRICE = 123456;
+  private BesuNode node;
+
+  @BeforeEach
+  public void setUp() throws Exception {
+    node =
+        besu.createPluginsNode(
+            "node1",
+            List.of("testPlugins"),
+            List.of(
+                "--Xin-process-rpc-enabled=true",
+                "--Xin-process-rpc-apis=MINER",
+                "--plugin-test-set-min-gas-price=" + MIN_GAS_PRICE),
+            "MINER");
+    cluster.start(node);
+  }
+
+  @Test
+  public void smokeTest() {
+    final var currMinGasPrice = node.execute(minerTransactions.minerGetMinGasPrice());
+    assertThat(currMinGasPrice).isEqualTo(BigInteger.valueOf(MIN_GAS_PRICE));
+  }
+}
diff --git a/besu/src/main/java/org/hyperledger/besu/Runner.java b/besu/src/main/java/org/hyperledger/besu/Runner.java
index eed35a03a94..609dab117ff 100644
--- a/besu/src/main/java/org/hyperledger/besu/Runner.java
+++ b/besu/src/main/java/org/hyperledger/besu/Runner.java
@@ -18,6 +18,7 @@
 import org.hyperledger.besu.ethereum.api.graphql.GraphQLHttpService;
 import org.hyperledger.besu.ethereum.api.jsonrpc.EngineJsonRpcService;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcHttpService;
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.methods.JsonRpcMethod;
 import org.hyperledger.besu.ethereum.api.jsonrpc.ipc.JsonRpcIpcService;
 import org.hyperledger.besu.ethereum.api.jsonrpc.websocket.WebSocketService;
 import org.hyperledger.besu.ethereum.api.query.cache.AutoTransactionLogBloomCachingService;
@@ -39,6 +40,7 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
+import java.util.Map;
 import java.util.Optional;
 import java.util.Properties;
 import java.util.concurrent.CompletableFuture;
@@ -69,6 +71,7 @@ public class Runner implements AutoCloseable {
   private final Optional<EngineJsonRpcService> engineJsonRpc;
   private final Optional<MetricsService> metrics;
   private final Optional<JsonRpcIpcService> ipcJsonRpc;
+  private final Map<String, JsonRpcMethod> inProcessRpcMethods;
   private final Optional<Path> pidPath;
   private final Optional<WebSocketService> webSocketRpc;
   private final TransactionPoolEvictionService transactionPoolEvictionService;
@@ -90,6 +93,7 @@ public class Runner implements AutoCloseable {
    * @param graphQLHttp the graph ql http
    * @param webSocketRpc the web socket rpc
    * @param ipcJsonRpc the ipc json rpc
+   * @param inProcessRpcMethods the in-process rpc methods
    * @param stratumServer the stratum server
    * @param metrics the metrics
    * @param ethStatsService the eth stats service
@@ -108,6 +112,7 @@ public class Runner implements AutoCloseable {
       final Optional<GraphQLHttpService> graphQLHttp,
       final Optional<WebSocketService> webSocketRpc,
       final Optional<JsonRpcIpcService> ipcJsonRpc,
+      final Map<String, JsonRpcMethod> inProcessRpcMethods,
       final Optional<StratumServer> stratumServer,
       final Optional<MetricsService> metrics,
       final Optional<EthStatsService> ethStatsService,
@@ -125,6 +130,7 @@ public class Runner implements AutoCloseable {
     this.engineJsonRpc = engineJsonRpc;
     this.webSocketRpc = webSocketRpc;
     this.ipcJsonRpc = ipcJsonRpc;
+    this.inProcessRpcMethods = inProcessRpcMethods;
     this.metrics = metrics;
     this.ethStatsService = ethStatsService;
     this.besuController = besuController;
@@ -413,6 +419,15 @@ public Optional<Integer> getMetricsPort() {
     }
   }
 
+  /**
+   * Get the RPC methods that can be called in-process
+   *
+   * @return RPC methods by name
+   */
+  public Map<String, JsonRpcMethod> getInProcessRpcMethods() {
+    return inProcessRpcMethods;
+  }
+
   /**
    * Gets local enode.
    *
diff --git a/besu/src/main/java/org/hyperledger/besu/RunnerBuilder.java b/besu/src/main/java/org/hyperledger/besu/RunnerBuilder.java
index d0c434fc819..e34c0115fea 100644
--- a/besu/src/main/java/org/hyperledger/besu/RunnerBuilder.java
+++ b/besu/src/main/java/org/hyperledger/besu/RunnerBuilder.java
@@ -34,6 +34,7 @@
 import org.hyperledger.besu.ethereum.api.graphql.GraphQLHttpService;
 import org.hyperledger.besu.ethereum.api.graphql.GraphQLProvider;
 import org.hyperledger.besu.ethereum.api.jsonrpc.EngineJsonRpcService;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcHttpService;
 import org.hyperledger.besu.ethereum.api.jsonrpc.authentication.AuthenticationService;
@@ -178,6 +179,7 @@ public class RunnerBuilder {
   private Optional<JsonRpcConfiguration> engineJsonRpcConfiguration = Optional.empty();
   private GraphQLConfiguration graphQLConfiguration;
   private WebSocketConfiguration webSocketConfiguration;
+  private InProcessRpcConfiguration inProcessRpcConfiguration;
   private ApiConfiguration apiConfiguration;
   private Path dataDir;
   private Optional<Path> pidPath = Optional.empty();
@@ -414,6 +416,18 @@ public RunnerBuilder webSocketConfiguration(final WebSocketConfiguration webSock
     return this;
   }
 
+  /**
+   * Add In-Process RPC configuration.
+   *
+   * @param inProcessRpcConfiguration the in-process RPC configuration
+   * @return the runner builder
+   */
+  public RunnerBuilder inProcessRpcConfiguration(
+      final InProcessRpcConfiguration inProcessRpcConfiguration) {
+    this.inProcessRpcConfiguration = inProcessRpcConfiguration;
+    return this;
+  }
+
   /**
    * Add Api configuration.
    *
@@ -1082,6 +1096,37 @@ public Runner build() {
       jsonRpcIpcService = Optional.empty();
     }
 
+    final Map<String, JsonRpcMethod> inProcessRpcMethods;
+    if (inProcessRpcConfiguration.isEnabled()) {
+      inProcessRpcMethods =
+          jsonRpcMethods(
+              protocolSchedule,
+              context,
+              besuController,
+              peerNetwork,
+              blockchainQueries,
+              synchronizer,
+              transactionPool,
+              miningParameters,
+              miningCoordinator,
+              metricsSystem,
+              supportedCapabilities,
+              inProcessRpcConfiguration.getInProcessRpcApis(),
+              filterManager,
+              accountLocalConfigPermissioningController,
+              nodeLocalConfigPermissioningController,
+              privacyParameters,
+              jsonRpcConfiguration,
+              webSocketConfiguration,
+              metricsConfiguration,
+              natService,
+              besuPluginContext.getNamedPlugins(),
+              dataDir,
+              rpcEndpointServiceImpl);
+    } else {
+      inProcessRpcMethods = Map.of();
+    }
+
     return new Runner(
         vertx,
         networkRunner,
@@ -1091,6 +1136,7 @@ public Runner build() {
         graphQLHttpService,
         webSocketService,
         jsonRpcIpcService,
+        inProcessRpcMethods,
         stratumServer,
         metricsService,
         ethStatsService,
diff --git a/besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java b/besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java
index d300fbea457..9c2b014ec01 100644
--- a/besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java
+++ b/besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java
@@ -63,6 +63,7 @@
 import org.hyperledger.besu.cli.options.unstable.DnsOptions;
 import org.hyperledger.besu.cli.options.unstable.EthProtocolOptions;
 import org.hyperledger.besu.cli.options.unstable.EvmOptions;
+import org.hyperledger.besu.cli.options.unstable.InProcessRpcOptions;
 import org.hyperledger.besu.cli.options.unstable.IpcOptions;
 import org.hyperledger.besu.cli.options.unstable.MetricsCLIOptions;
 import org.hyperledger.besu.cli.options.unstable.NatOptions;
@@ -107,6 +108,7 @@
 import org.hyperledger.besu.ethereum.GasLimitCalculator;
 import org.hyperledger.besu.ethereum.api.ApiConfiguration;
 import org.hyperledger.besu.ethereum.api.graphql.GraphQLConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.RpcApis;
 import org.hyperledger.besu.ethereum.api.jsonrpc.authentication.JwtAlgorithm;
@@ -660,6 +662,10 @@ static class EngineRPCOptionGroup {
   @CommandLine.ArgGroup(validate = false, heading = "@|bold JSON-RPC Websocket Options|@%n")
   RpcWebsocketOptions rpcWebsocketOptions = new RpcWebsocketOptions();
 
+  // In-Process RPC Options
+  @CommandLine.ArgGroup(validate = false, heading = "@|bold In-Process RPC Options|@%n")
+  InProcessRpcOptions inProcessRpcOptions = InProcessRpcOptions.create();
+
   // Privacy Options Group
   @CommandLine.ArgGroup(validate = false, heading = "@|bold Privacy Options|@%n")
   PrivacyOptionGroup privacyOptionGroup = new PrivacyOptionGroup();
@@ -926,6 +932,7 @@ static class MetricsOptionGroup {
   private GraphQLConfiguration graphQLConfiguration;
   private WebSocketConfiguration webSocketConfiguration;
   private JsonRpcIpcConfiguration jsonRpcIpcConfiguration;
+  private InProcessRpcConfiguration inProcessRpcConfiguration;
   private ApiConfiguration apiConfiguration;
   private MetricsConfiguration metricsConfiguration;
   private Optional<PermissioningConfiguration> permissioningConfiguration;
@@ -1353,6 +1360,7 @@ private Runner buildRunner() {
         engineJsonRpcConfiguration,
         webSocketConfiguration,
         jsonRpcIpcConfiguration,
+        inProcessRpcConfiguration,
         apiConfiguration,
         metricsConfiguration,
         permissioningConfiguration,
@@ -1370,6 +1378,7 @@ private void startPlugins(final Runner runner) {
             besuController.getProtocolContext().getWorldStateArchive(),
             besuController.getProtocolSchedule(),
             apiConfiguration.getGasCap()));
+    rpcEndpointServiceImpl.init(runner.getInProcessRpcMethods());
 
     besuPluginContext.addService(
         BesuEvents.class,
@@ -1810,6 +1819,7 @@ private void configure() throws Exception {
             unstableIpcOptions.isEnabled(),
             unstableIpcOptions.getIpcPath(),
             unstableIpcOptions.getRpcIpcApis());
+    inProcessRpcConfiguration = inProcessRpcOptions.toDomainObject();
     apiConfiguration = apiConfigurationOptions.apiConfiguration();
     dataStorageConfiguration = getDataStorageConfiguration();
     // hostsWhitelist is a hidden option. If it is specified, add the list to hostAllowlist
@@ -2321,6 +2331,7 @@ private Runner synchronize(
       final JsonRpcConfiguration engineJsonRpcConfiguration,
       final WebSocketConfiguration webSocketConfiguration,
       final JsonRpcIpcConfiguration jsonRpcIpcConfiguration,
+      final InProcessRpcConfiguration inProcessRpcConfiguration,
       final ApiConfiguration apiConfiguration,
       final MetricsConfiguration metricsConfiguration,
       final Optional<PermissioningConfiguration> permissioningConfiguration,
@@ -2353,6 +2364,7 @@ private Runner synchronize(
             .engineJsonRpcConfiguration(engineJsonRpcConfiguration)
             .webSocketConfiguration(webSocketConfiguration)
             .jsonRpcIpcConfiguration(jsonRpcIpcConfiguration)
+            .inProcessRpcConfiguration(inProcessRpcConfiguration)
             .apiConfiguration(apiConfiguration)
             .pidPath(pidPath)
             .dataDir(dataDir())
diff --git a/besu/src/main/java/org/hyperledger/besu/cli/options/unstable/InProcessRpcOptions.java b/besu/src/main/java/org/hyperledger/besu/cli/options/unstable/InProcessRpcOptions.java
new file mode 100644
index 00000000000..9adeb37db7d
--- /dev/null
+++ b/besu/src/main/java/org/hyperledger/besu/cli/options/unstable/InProcessRpcOptions.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.cli.options.unstable;
+
+import static org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration.DEFAULT_IN_PROCESS_RPC_APIS;
+import static org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration.DEFAULT_IN_PROCESS_RPC_ENABLED;
+
+import org.hyperledger.besu.cli.options.CLIOptions;
+import org.hyperledger.besu.cli.util.CommandLineUtils;
+import org.hyperledger.besu.ethereum.api.jsonrpc.ImmutableInProcessRpcConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
+
+import java.util.List;
+import java.util.Set;
+
+import picocli.CommandLine;
+
+/** The in process RPC options. */
+public class InProcessRpcOptions implements CLIOptions<InProcessRpcConfiguration> {
+
+  /** Default constructor. */
+  InProcessRpcOptions() {}
+
+  /**
+   * Create ipc options.
+   *
+   * @return the ipc options
+   */
+  public static InProcessRpcOptions create() {
+    return new InProcessRpcOptions();
+  }
+
+  @CommandLine.Option(
+      names = {"--Xin-process-rpc-enabled"},
+      hidden = true,
+      description = "Set to enalbe in-process RPC method call service (default: ${DEFAULT-VALUE})")
+  private final Boolean enabled = DEFAULT_IN_PROCESS_RPC_ENABLED;
+
+  @CommandLine.Option(
+      names = {"--Xin-process-rpc-api", "--Xin-process-rpc-apis"},
+      hidden = true,
+      paramLabel = "<api name>",
+      split = " {0,1}, {0,1}",
+      arity = "1..*",
+      description =
+          "Comma separated list of APIs to enable on  in-process RPC method call service (default: ${DEFAULT-VALUE})")
+  private final Set<String> inProcessRpcApis = DEFAULT_IN_PROCESS_RPC_APIS;
+
+  @Override
+  public InProcessRpcConfiguration toDomainObject() {
+    return ImmutableInProcessRpcConfiguration.builder()
+        .isEnabled(enabled)
+        .inProcessRpcApis(inProcessRpcApis)
+        .build();
+  }
+
+  @Override
+  public List<String> getCLIOptions() {
+    return CommandLineUtils.getCLIOptions(this, new InProcessRpcOptions());
+  }
+}
diff --git a/besu/src/main/java/org/hyperledger/besu/services/RpcEndpointServiceImpl.java b/besu/src/main/java/org/hyperledger/besu/services/RpcEndpointServiceImpl.java
index f31323b91b8..dcfe29146e7 100644
--- a/besu/src/main/java/org/hyperledger/besu/services/RpcEndpointServiceImpl.java
+++ b/besu/src/main/java/org/hyperledger/besu/services/RpcEndpointServiceImpl.java
@@ -17,25 +17,48 @@
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequest;
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequestContext;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.methods.JsonRpcMethod;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.methods.PluginJsonRpcMethod;
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcErrorResponse;
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcSuccessResponse;
 import org.hyperledger.besu.plugin.services.RpcEndpointService;
 import org.hyperledger.besu.plugin.services.rpc.PluginRpcRequest;
+import org.hyperledger.besu.plugin.services.rpc.PluginRpcResponse;
+import org.hyperledger.besu.plugin.services.rpc.RpcResponseType;
 
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
+import java.util.NoSuchElementException;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /** The RPC endpoint service implementation. */
 public class RpcEndpointServiceImpl implements RpcEndpointService {
+  private static final Logger LOG = LoggerFactory.getLogger(RpcEndpointServiceImpl.class);
+
   private final Map<String, Function<PluginRpcRequest, ?>> rpcMethods = new HashMap<>();
+  private Map<String, JsonRpcMethod> inProcessRpcMethods;
 
   /** Default Constructor. */
   public RpcEndpointServiceImpl() {}
 
+  /**
+   * Init the service
+   *
+   * @param inProcessRpcMethods set of RPC methods that can be called
+   */
+  public void init(final Map<String, JsonRpcMethod> inProcessRpcMethods) {
+    this.inProcessRpcMethods = inProcessRpcMethods;
+  }
+
   @Override
   public <T> void registerRPCEndpoint(
       final String namespace,
@@ -48,6 +71,44 @@ public <T> void registerRPCEndpoint(
     rpcMethods.put(namespace + "_" + functionName, function);
   }
 
+  @Override
+  public PluginRpcResponse call(final String methodName, final Object[] params) {
+    checkNotNull(
+        inProcessRpcMethods,
+        "Service not initialized yet, this method must be called after plugin 'beforeExternalServices' call completes");
+
+    LOG.atTrace()
+        .setMessage("Calling method:{} with params:{}")
+        .addArgument(methodName)
+        .addArgument(() -> Arrays.toString(params))
+        .log();
+
+    final var method = inProcessRpcMethods.get(methodName);
+
+    if (method == null) {
+      throw new NoSuchElementException("Unknown or not enabled method: " + methodName);
+    }
+
+    final var requestContext =
+        new JsonRpcRequestContext(new JsonRpcRequest("2.0", methodName, params));
+    final var response = method.response(requestContext);
+    return new PluginRpcResponse() {
+      @Override
+      public Object getResult() {
+        return switch (response.getType()) {
+          case NONE, UNAUTHORIZED -> null;
+          case SUCCESS -> ((JsonRpcSuccessResponse) response).getResult();
+          case ERROR -> ((JsonRpcErrorResponse) response).getError();
+        };
+      }
+
+      @Override
+      public RpcResponseType getType() {
+        return response.getType();
+      }
+    };
+  }
+
   /**
    * Gets plugin methods.
    *
diff --git a/besu/src/test/java/org/hyperledger/besu/RunnerBuilderTest.java b/besu/src/test/java/org/hyperledger/besu/RunnerBuilderTest.java
index c1770640801..c7180b958c1 100644
--- a/besu/src/test/java/org/hyperledger/besu/RunnerBuilderTest.java
+++ b/besu/src/test/java/org/hyperledger/besu/RunnerBuilderTest.java
@@ -38,6 +38,7 @@
 import org.hyperledger.besu.ethereum.ProtocolContext;
 import org.hyperledger.besu.ethereum.api.ImmutableApiConfiguration;
 import org.hyperledger.besu.ethereum.api.graphql.GraphQLConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.InProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.ipc.JsonRpcIpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.websocket.WebSocketConfiguration;
@@ -163,6 +164,7 @@ public void enodeUrlShouldHaveAdvertisedHostWhenDiscoveryDisabled() {
             .graphQLConfiguration(mock(GraphQLConfiguration.class))
             .webSocketConfiguration(mock(WebSocketConfiguration.class))
             .jsonRpcIpcConfiguration(mock(JsonRpcIpcConfiguration.class))
+            .inProcessRpcConfiguration(mock(InProcessRpcConfiguration.class))
             .metricsConfiguration(mock(MetricsConfiguration.class))
             .vertx(vertx)
             .dataDir(dataDir.getRoot())
@@ -208,6 +210,7 @@ public void movingAcrossProtocolSpecsUpdatesNodeRecord() {
             .graphQLConfiguration(mock(GraphQLConfiguration.class))
             .webSocketConfiguration(mock(WebSocketConfiguration.class))
             .jsonRpcIpcConfiguration(mock(JsonRpcIpcConfiguration.class))
+            .inProcessRpcConfiguration(mock(InProcessRpcConfiguration.class))
             .metricsConfiguration(mock(MetricsConfiguration.class))
             .vertx(Vertx.vertx())
             .dataDir(dataDir.getRoot())
@@ -267,6 +270,7 @@ public void whenEngineApiAddedListensOnDefaultPort() {
             .graphQLConfiguration(mock(GraphQLConfiguration.class))
             .webSocketConfiguration(mock(WebSocketConfiguration.class))
             .jsonRpcIpcConfiguration(mock(JsonRpcIpcConfiguration.class))
+            .inProcessRpcConfiguration(mock(InProcessRpcConfiguration.class))
             .metricsConfiguration(mock(MetricsConfiguration.class))
             .vertx(Vertx.vertx())
             .dataDir(dataDir.getRoot())
@@ -309,6 +313,7 @@ public void whenEngineApiAddedWebSocketReadyOnSamePort() {
             .engineJsonRpcConfiguration(engineConf)
             .webSocketConfiguration(wsRpc)
             .jsonRpcIpcConfiguration(mock(JsonRpcIpcConfiguration.class))
+            .inProcessRpcConfiguration(mock(InProcessRpcConfiguration.class))
             .graphQLConfiguration(mock(GraphQLConfiguration.class))
             .metricsConfiguration(mock(MetricsConfiguration.class))
             .vertx(Vertx.vertx())
@@ -351,6 +356,7 @@ public void whenEngineApiAddedEthSubscribeAvailable() {
             .engineJsonRpcConfiguration(engineConf)
             .webSocketConfiguration(wsRpc)
             .jsonRpcIpcConfiguration(mock(JsonRpcIpcConfiguration.class))
+            .inProcessRpcConfiguration(mock(InProcessRpcConfiguration.class))
             .graphQLConfiguration(mock(GraphQLConfiguration.class))
             .metricsConfiguration(mock(MetricsConfiguration.class))
             .vertx(Vertx.vertx())
@@ -395,6 +401,7 @@ public void noEngineApiNoServiceForMethods() {
             .graphQLConfiguration(mock(GraphQLConfiguration.class))
             .webSocketConfiguration(defaultWebSockConfig)
             .jsonRpcIpcConfiguration(mock(JsonRpcIpcConfiguration.class))
+            .inProcessRpcConfiguration(mock(InProcessRpcConfiguration.class))
             .metricsConfiguration(mock(MetricsConfiguration.class))
             .vertx(Vertx.vertx())
             .dataDir(dataDir.getRoot())
diff --git a/besu/src/test/java/org/hyperledger/besu/RunnerTest.java b/besu/src/test/java/org/hyperledger/besu/RunnerTest.java
index e10d5475818..5b2a56078f5 100644
--- a/besu/src/test/java/org/hyperledger/besu/RunnerTest.java
+++ b/besu/src/test/java/org/hyperledger/besu/RunnerTest.java
@@ -36,6 +36,7 @@
 import org.hyperledger.besu.ethereum.ProtocolContext;
 import org.hyperledger.besu.ethereum.api.ImmutableApiConfiguration;
 import org.hyperledger.besu.ethereum.api.graphql.GraphQLConfiguration;
+import org.hyperledger.besu.ethereum.api.jsonrpc.ImmutableInProcessRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.ipc.JsonRpcIpcConfiguration;
 import org.hyperledger.besu.ethereum.api.jsonrpc.websocket.WebSocketConfiguration;
@@ -211,6 +212,7 @@ private void syncFromGenesis(final SyncMode mode, final GenesisConfigFile genesi
             .graphQLConfiguration(graphQLConfiguration())
             .webSocketConfiguration(wsRpcConfiguration())
             .jsonRpcIpcConfiguration(new JsonRpcIpcConfiguration())
+            .inProcessRpcConfiguration(ImmutableInProcessRpcConfiguration.builder().build())
             .metricsConfiguration(metricsConfiguration())
             .dataDir(dbAhead)
             .pidPath(pidPath)
diff --git a/besu/src/test/java/org/hyperledger/besu/cli/CommandTestAbstract.java b/besu/src/test/java/org/hyperledger/besu/cli/CommandTestAbstract.java
index c77ced5c6fe..f6fa2e47984 100644
--- a/besu/src/test/java/org/hyperledger/besu/cli/CommandTestAbstract.java
+++ b/besu/src/test/java/org/hyperledger/besu/cli/CommandTestAbstract.java
@@ -332,6 +332,7 @@ public void initMocks() throws Exception {
     when(mockRunnerBuilder.graphQLConfiguration(any())).thenReturn(mockRunnerBuilder);
     when(mockRunnerBuilder.webSocketConfiguration(any())).thenReturn(mockRunnerBuilder);
     when(mockRunnerBuilder.jsonRpcIpcConfiguration(any())).thenReturn(mockRunnerBuilder);
+    when(mockRunnerBuilder.inProcessRpcConfiguration(any())).thenReturn(mockRunnerBuilder);
     when(mockRunnerBuilder.apiConfiguration(any())).thenReturn(mockRunnerBuilder);
     when(mockRunnerBuilder.dataDir(any())).thenReturn(mockRunnerBuilder);
     when(mockRunnerBuilder.bannedNodeIds(any())).thenReturn(mockRunnerBuilder);
diff --git a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/InProcessRpcConfiguration.java b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/InProcessRpcConfiguration.java
new file mode 100644
index 00000000000..e59d06a21fb
--- /dev/null
+++ b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/InProcessRpcConfiguration.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.ethereum.api.jsonrpc;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.immutables.value.Value;
+
+@Value.Immutable
+public interface InProcessRpcConfiguration {
+  boolean DEFAULT_IN_PROCESS_RPC_ENABLED = false;
+  Set<String> DEFAULT_IN_PROCESS_RPC_APIS = new HashSet<>(RpcApis.DEFAULT_RPC_APIS);
+
+  @Value.Default
+  default boolean isEnabled() {
+    return DEFAULT_IN_PROCESS_RPC_ENABLED;
+  }
+
+  @Value.Default
+  default Set<String> getInProcessRpcApis() {
+    return DEFAULT_IN_PROCESS_RPC_APIS;
+  }
+}
diff --git a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/response/JsonRpcResponse.java b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/response/JsonRpcResponse.java
index 6817d2cfbbd..5fb82187b69 100644
--- a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/response/JsonRpcResponse.java
+++ b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/response/JsonRpcResponse.java
@@ -14,16 +14,14 @@
  */
 package org.hyperledger.besu.ethereum.api.jsonrpc.internal.response;
 
-import org.hyperledger.besu.plugin.services.rpc.RpcResponseType;
+import org.hyperledger.besu.plugin.services.rpc.RpcResponse;
 
 import com.fasterxml.jackson.annotation.JsonGetter;
 
-public interface JsonRpcResponse {
+public interface JsonRpcResponse extends RpcResponse {
 
   @JsonGetter("jsonrpc")
   default String getVersion() {
     return "2.0";
   }
-
-  RpcResponseType getType();
 }
diff --git a/plugin-api/build.gradle b/plugin-api/build.gradle
index cc4b3237b52..e49297ab7b3 100644
--- a/plugin-api/build.gradle
+++ b/plugin-api/build.gradle
@@ -70,7 +70,7 @@ Calculated : ${currentHash}
 tasks.register('checkAPIChanges', FileStateChecker) {
   description = "Checks that the API for the Plugin-API project does not change without deliberate thought"
   files = sourceSets.main.allJava.files
-  knownHash = 'tXFd8EcMJtD+ZSLJxWJLYRZD0d3njRz+3Ubey2zFM2A='
+  knownHash = 'I851CCOs00yYpW10qIGIak1bKbYhKFQkV2wyCYELHKY='
 }
 check.dependsOn('checkAPIChanges')
 
diff --git a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/RpcEndpointService.java b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/RpcEndpointService.java
index a1b69a7c7fe..512d9877c78 100644
--- a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/RpcEndpointService.java
+++ b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/RpcEndpointService.java
@@ -15,6 +15,7 @@
 package org.hyperledger.besu.plugin.services;
 
 import org.hyperledger.besu.plugin.services.rpc.PluginRpcRequest;
+import org.hyperledger.besu.plugin.services.rpc.PluginRpcResponse;
 
 import java.util.function.Function;
 
@@ -54,4 +55,13 @@ public interface RpcEndpointService extends BesuService {
    */
   <T> void registerRPCEndpoint(
       String namespace, String functionName, Function<PluginRpcRequest, T> function);
+
+  /**
+   * Allow to call any of the enabled in-process RPC methods
+   *
+   * @param methodName the method to invoke
+   * @param params the list of parameters accepted by the method
+   * @return the result of the method
+   */
+  PluginRpcResponse call(String methodName, Object[] params);
 }
diff --git a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/PluginRpcRequest.java b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/PluginRpcRequest.java
index c360f35edc1..eab35b4b043 100644
--- a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/PluginRpcRequest.java
+++ b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/PluginRpcRequest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright ConsenSys AG.
+ * Copyright contributors to Hyperledger Besu.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
diff --git a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/PluginRpcResponse.java b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/PluginRpcResponse.java
new file mode 100644
index 00000000000..7096a8a4227
--- /dev/null
+++ b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/PluginRpcResponse.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.plugin.services.rpc;
+
+/** The interface Plugin rpc response. */
+public interface PluginRpcResponse extends RpcResponse {
+
+  /**
+   * Get the result, unfortunately there is no typing yet, so call must know how to interact with
+   * the response
+   *
+   * @return the result
+   */
+  Object getResult();
+}
diff --git a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/RpcResponse.java b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/RpcResponse.java
new file mode 100644
index 00000000000..3fafbb1d108
--- /dev/null
+++ b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/rpc/RpcResponse.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.plugin.services.rpc;
+
+/** Represent a Json RPC response */
+public interface RpcResponse {
+
+  /**
+   * Get the response type
+   *
+   * @return the response type
+   */
+  RpcResponseType getType();
+}