diff --git a/besu/src/main/java/org/hyperledger/besu/services/TransactionSimulationServiceImpl.java b/besu/src/main/java/org/hyperledger/besu/services/TransactionSimulationServiceImpl.java
index 54cce205a36..4dc411ee0be 100644
--- a/besu/src/main/java/org/hyperledger/besu/services/TransactionSimulationServiceImpl.java
+++ b/besu/src/main/java/org/hyperledger/besu/services/TransactionSimulationServiceImpl.java
@@ -14,6 +14,7 @@
  */
 package org.hyperledger.besu.services;
 
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.datatypes.Transaction;
 import org.hyperledger.besu.ethereum.chain.Blockchain;
@@ -62,6 +63,17 @@ public Optional<TransactionSimulationResult> simulate(
       final Hash blockHash,
       final OperationTracer operationTracer,
       final boolean isAllowExceedingBalance) {
+    return simulate(
+        transaction, Optional.empty(), blockHash, operationTracer, isAllowExceedingBalance);
+  }
+
+  @Override
+  public Optional<TransactionSimulationResult> simulate(
+      final Transaction transaction,
+      final Optional<AccountOverrideMap> maybeAccountOverrides,
+      final Hash blockHash,
+      final OperationTracer operationTracer,
+      final boolean isAllowExceedingBalance) {
 
     final CallParameter callParameter = CallParameter.fromTransaction(transaction);
 
@@ -79,6 +91,7 @@ public Optional<TransactionSimulationResult> simulate(
     return transactionSimulator
         .process(
             callParameter,
+            maybeAccountOverrides,
             isAllowExceedingBalance
                 ? SIMULATOR_ALLOWING_EXCEEDING_BALANCE
                 : TransactionValidationParams.transactionSimulator(),
diff --git a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/util/AccountOverride.java b/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverride.java
similarity index 76%
rename from ethereum/core/src/main/java/org/hyperledger/besu/ethereum/util/AccountOverride.java
rename to datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverride.java
index 3bae4af1d84..e414e97eb5d 100644
--- a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/util/AccountOverride.java
+++ b/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverride.java
@@ -12,9 +12,7 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
-package org.hyperledger.besu.ethereum.util;
-
-import org.hyperledger.besu.datatypes.Wei;
+package org.hyperledger.besu.datatypes;
 
 import java.util.Map;
 import java.util.Objects;
@@ -26,11 +24,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-// similar to AccountDiff
-// BUT
-// there are more fields that need to be added
-// stateDiff
-// movePrecompileToAddress
+/** Account Override parameter class */
 @JsonIgnoreProperties(ignoreUnknown = true)
 @JsonDeserialize(builder = AccountOverride.Builder.class)
 public class AccountOverride {
@@ -52,22 +46,43 @@ private AccountOverride(
     this.stateDiff = stateDiff;
   }
 
+  /**
+   * Gets the balance override
+   *
+   * @return the balance if present
+   */
   public Optional<Wei> getBalance() {
     return balance;
   }
 
+  /**
+   * Gets the nonce override
+   *
+   * @return the nonce if present
+   */
   public Optional<Long> getNonce() {
     return nonce;
   }
 
+  /**
+   * Gets the code override
+   *
+   * @return the code if present
+   */
   public Optional<String> getCode() {
     return code;
   }
 
+  /**
+   * Gets the state override map
+   *
+   * @return the state override map if present
+   */
   public Optional<Map<String, String>> getStateDiff() {
     return stateDiff;
   }
 
+  /** Builder class for Account overrides */
   public static class Builder {
     private Optional<Wei> balance = Optional.empty();
     private Optional<Long> nonce = Optional.empty();
@@ -77,31 +92,66 @@ public static class Builder {
     /** Default constructor. */
     public Builder() {}
 
+    /**
+     * Sets the balance override
+     *
+     * @param balance the balance override
+     * @return the builder
+     */
     public Builder withBalance(final Wei balance) {
       this.balance = Optional.ofNullable(balance);
       return this;
     }
 
+    /**
+     * Sets the nonce override
+     *
+     * @param nonce the nonce override
+     * @return the builder
+     */
     public Builder withNonce(final Long nonce) {
       this.nonce = Optional.ofNullable(nonce);
       return this;
     }
 
+    /**
+     * Sets the code override
+     *
+     * @param code the code override
+     * @return the builder
+     */
     public Builder withCode(final String code) {
       this.code = Optional.ofNullable(code);
       return this;
     }
 
+    /**
+     * Sets the state diff override
+     *
+     * @param stateDiff the map of state overrides
+     * @return the builder
+     */
     public Builder withStateDiff(final Map<String, String> stateDiff) {
       this.stateDiff = Optional.ofNullable(stateDiff);
       return this;
     }
 
+    /**
+     * build the account override from the builder
+     *
+     * @return account override
+     */
     public AccountOverride build() {
       return new AccountOverride(balance, nonce, code, stateDiff);
     }
   }
 
+  /**
+   * utility method to log unknown properties
+   *
+   * @param key key for the unrecognized value
+   * @param value the unrecognized value
+   */
   @JsonAnySetter
   public void withUnknownProperties(final String key, final Object value) {
     LOG.debug(
diff --git a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/util/AccountOverrideMap.java b/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverrideMap.java
similarity index 87%
rename from ethereum/core/src/main/java/org/hyperledger/besu/ethereum/util/AccountOverrideMap.java
rename to datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverrideMap.java
index 30fc808c9bb..20aee461859 100644
--- a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/util/AccountOverrideMap.java
+++ b/datatypes/src/main/java/org/hyperledger/besu/datatypes/AccountOverrideMap.java
@@ -12,16 +12,16 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
-package org.hyperledger.besu.ethereum.util;
-
-import org.hyperledger.besu.datatypes.Address;
+package org.hyperledger.besu.datatypes;
 
 import java.util.HashMap;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 
+/** Map of account overrides, indexed by address */
 @JsonIgnoreProperties(ignoreUnknown = true)
 public class AccountOverrideMap extends HashMap<Address, AccountOverride> {
 
+  /** Default constructor */
   public AccountOverrideMap() {}
 }
diff --git a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCall.java b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCall.java
index 5f736e8d5a9..ef5c8c7a6cf 100644
--- a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCall.java
+++ b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCall.java
@@ -17,6 +17,7 @@
 import static org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.RpcErrorType.BLOCK_NOT_FOUND;
 import static org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.RpcErrorType.INTERNAL_ERROR;
 
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.datatypes.Wei;
 import org.hyperledger.besu.ethereum.api.jsonrpc.JsonRpcErrorConverter;
@@ -41,7 +42,6 @@
 import org.hyperledger.besu.ethereum.transaction.TransactionInvalidReason;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulator;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulatorResult;
-import org.hyperledger.besu.ethereum.util.AccountOverrideMap;
 import org.hyperledger.besu.evm.tracing.OperationTracer;
 
 import java.util.Optional;
diff --git a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGas.java b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGas.java
index ab758dadec7..2352a5a8c37 100644
--- a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGas.java
+++ b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGas.java
@@ -14,6 +14,7 @@
  */
 package org.hyperledger.besu.ethereum.api.jsonrpc.internal.methods;
 
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.ethereum.api.jsonrpc.RpcMethod;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequestContext;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.exception.InvalidJsonRpcRequestException;
@@ -29,7 +30,6 @@
 import org.hyperledger.besu.ethereum.transaction.CallParameter;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulator;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulatorResult;
-import org.hyperledger.besu.ethereum.util.AccountOverrideMap;
 import org.hyperledger.besu.evm.tracing.EstimateGasOperationTracer;
 
 import java.util.Optional;
diff --git a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java
index d16de7d9943..7de6f65aae2 100644
--- a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java
+++ b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthCallTest.java
@@ -27,6 +27,8 @@
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 import static org.mockito.Mockito.when;
 
+import org.hyperledger.besu.datatypes.AccountOverride;
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.datatypes.Wei;
@@ -51,8 +53,6 @@
 import org.hyperledger.besu.ethereum.transaction.PreCloseStateHandler;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulator;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulatorResult;
-import org.hyperledger.besu.ethereum.util.AccountOverride;
-import org.hyperledger.besu.ethereum.util.AccountOverrideMap;
 
 import java.util.Optional;
 
diff --git a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java
index 9f321e00502..7c770f08a2d 100644
--- a/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java
+++ b/ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/EthEstimateGasTest.java
@@ -21,6 +21,8 @@
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
+import org.hyperledger.besu.datatypes.AccountOverride;
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.datatypes.Wei;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequest;
@@ -44,8 +46,6 @@
 import org.hyperledger.besu.ethereum.transaction.TransactionInvalidReason;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulator;
 import org.hyperledger.besu.ethereum.transaction.TransactionSimulatorResult;
-import org.hyperledger.besu.ethereum.util.AccountOverride;
-import org.hyperledger.besu.ethereum.util.AccountOverrideMap;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateArchive;
 import org.hyperledger.besu.evm.tracing.OperationTracer;
 
diff --git a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulator.java b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulator.java
index 3f35492b2b4..1c6140f1d1f 100644
--- a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulator.java
+++ b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulator.java
@@ -19,6 +19,8 @@
 import org.hyperledger.besu.crypto.SECPSignature;
 import org.hyperledger.besu.crypto.SignatureAlgorithm;
 import org.hyperledger.besu.crypto.SignatureAlgorithmFactory;
+import org.hyperledger.besu.datatypes.AccountOverride;
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.datatypes.BlobGas;
 import org.hyperledger.besu.datatypes.Hash;
@@ -34,8 +36,6 @@
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSpec;
 import org.hyperledger.besu.ethereum.mainnet.TransactionValidationParams;
 import org.hyperledger.besu.ethereum.processing.TransactionProcessingResult;
-import org.hyperledger.besu.ethereum.util.AccountOverride;
-import org.hyperledger.besu.ethereum.util.AccountOverrideMap;
 import org.hyperledger.besu.ethereum.vm.CachingBlockHashLookup;
 import org.hyperledger.besu.ethereum.vm.DebugOperationTracer;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateArchive;
@@ -105,6 +105,7 @@ public Optional<TransactionSimulatorResult> process(
     final BlockHeader header = blockchain.getBlockHeader(blockNumber).orElse(null);
     return process(
         callParams,
+        Optional.empty(),
         transactionValidationParams,
         operationTracer,
         (mutableWorldState, transactionSimulatorResult) -> transactionSimulatorResult,
@@ -118,6 +119,7 @@ public Optional<TransactionSimulatorResult> process(
       final BlockHeader blockHeader) {
     return process(
         callParams,
+        Optional.empty(),
         transactionValidationParams,
         operationTracer,
         (mutableWorldState, transactionSimulatorResult) -> transactionSimulatorResult,
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulatorTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulatorTest.java
index 0dfa7e924fa..e0715e58477 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulatorTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/transaction/TransactionSimulatorTest.java
@@ -26,6 +26,7 @@
 import org.hyperledger.besu.crypto.SECPSignature;
 import org.hyperledger.besu.crypto.SignatureAlgorithm;
 import org.hyperledger.besu.crypto.SignatureAlgorithmFactory;
+import org.hyperledger.besu.datatypes.AccountOverride;
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.datatypes.BlobsWithCommitments;
 import org.hyperledger.besu.datatypes.Hash;
@@ -48,7 +49,6 @@
 import org.hyperledger.besu.ethereum.mainnet.feemarket.FeeMarket;
 import org.hyperledger.besu.ethereum.processing.TransactionProcessingResult;
 import org.hyperledger.besu.ethereum.processing.TransactionProcessingResult.Status;
-import org.hyperledger.besu.ethereum.util.AccountOverride;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateArchive;
 import org.hyperledger.besu.evm.account.Account;
 import org.hyperledger.besu.evm.account.MutableAccount;
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/util/AccountOverrideParameterTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/util/AccountOverrideParameterTest.java
index 8e7b5c3f0eb..1b6d8c1cbe3 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/util/AccountOverrideParameterTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/util/AccountOverrideParameterTest.java
@@ -18,6 +18,8 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import org.hyperledger.besu.datatypes.AccountOverride;
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Address;
 import org.hyperledger.besu.datatypes.Wei;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequest;
diff --git a/plugin-api/build.gradle b/plugin-api/build.gradle
index 333cac59268..dfdf20bff21 100644
--- a/plugin-api/build.gradle
+++ b/plugin-api/build.gradle
@@ -71,7 +71,7 @@ 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 = 'wOjR3/uPElPs1GonuLMBWStn1zukFMyy/GfQ9OYChpI='
+  knownHash = 'IPpTJJxjDbjW08c3Cm8GbBhULYFy0jq9m3BzliGzrf8='
 }
 check.dependsOn('checkAPIChanges')
 
diff --git a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/TransactionSimulationService.java b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/TransactionSimulationService.java
index dffdb0cfe51..d5fc0a34979 100644
--- a/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/TransactionSimulationService.java
+++ b/plugin-api/src/main/java/org/hyperledger/besu/plugin/services/TransactionSimulationService.java
@@ -14,6 +14,7 @@
  */
 package org.hyperledger.besu.plugin.services;
 
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
 import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.datatypes.Transaction;
 import org.hyperledger.besu.evm.tracing.OperationTracer;
@@ -39,4 +40,21 @@ Optional<TransactionSimulationResult> simulate(
       Hash blockHash,
       OperationTracer operationTracer,
       boolean isAllowExceedingBalance);
+
+  /**
+   * Simulate transaction execution at the block identified by the hash
+   *
+   * @param transaction tx
+   * @param accountOverrides state overrides to apply to this simulation
+   * @param blockHash the hash of the block
+   * @param operationTracer the tracer
+   * @param isAllowExceedingBalance should ignore the sender balance during the simulation?
+   * @return the result of the simulation
+   */
+  Optional<TransactionSimulationResult> simulate(
+      Transaction transaction,
+      Optional<AccountOverrideMap> accountOverrides,
+      Hash blockHash,
+      OperationTracer operationTracer,
+      boolean isAllowExceedingBalance);
 }