diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c0f33f717..9589fffc89 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Additions and Improvements
 - Version information available in metrics [#3997](https://github.com/hyperledger/besu/pull/3997)
 - Add TTD and DNS to Sepolia config [#4024](https://github.com/hyperledger/besu/pull/4024)
+- Return `type` with value `0x0` when serializing legacy transactions [#4027](https://github.com/hyperledger/besu/pull/4027)
 
 ### Bug Fixes
 - Fixed a snapsync issue that can sometimes block the healing step [#3920](https://github.com/hyperledger/besu/pull/3920)
diff --git a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/TransactionCompleteResult.java b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/TransactionCompleteResult.java
index a3c845bcac..2a08d63c56 100644
--- a/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/TransactionCompleteResult.java
+++ b/ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/TransactionCompleteResult.java
@@ -113,7 +113,7 @@ public class TransactionCompleteResult implements TransactionResult {
     this.transactionIndex = Quantity.create(tx.getTransactionIndex().get());
     this.type =
         transactionType.equals(TransactionType.FRONTIER)
-            ? null
+            ? Quantity.create(0)
             : Quantity.create(transactionType.getSerializedType());
     this.value = Quantity.create(transaction.getValue());
     this.v = Quantity.create(transaction.getV());
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getBlockByNumber_complete.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getBlockByNumber_complete.json
index be551ec4b2..cc3061f0c2 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getBlockByNumber_complete.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getBlockByNumber_complete.json
@@ -45,6 +45,7 @@
           "raw": "0xf8840f018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0aa4c2b12a73aabbccffffffffffffffffffffffffffffffffffffffffffffffffffffffffee1ba00394fa9c43a2469d48b98f4f7e8dfdf7bd3c7abd9eafe8c124b362594aafc5d6a00ecf369283eda15f4c4db09784b5226dfe48a0a80ff91e87d858f6adbb131cf9",
           "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
           "transactionIndex": "0x0",
+          "type" : "0x0",
           "value": "0xa",
           "v": "0x1b",
           "r": "0x394fa9c43a2469d48b98f4f7e8dfdf7bd3c7abd9eafe8c124b362594aafc5d6",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_00.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_00.json
index 3a9103213f..532af58e0e 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_00.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_00.json
@@ -24,6 +24,7 @@
       "raw": "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",
       "to": null,
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1c",
       "r": "0xe439aa8812c1c0a751b0931ea20c5a30cd54fe15cae883c59fd8107e04557679",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_01.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_01.json
index a09d02b925..d412894f41 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_01.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_01.json
@@ -24,6 +24,7 @@
       "raw": "0xf86401018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0a8412a7b9141ba0ed2e0f715eccaab4362c19c1cf35ad8031ab1cabe71ada3fe8b269fe9d726712a06691074f289f826d23c92808ae363959eb958fb7a91fc721875ece4958114c65",
       "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1b",
       "r": "0xed2e0f715eccaab4362c19c1cf35ad8031ab1cabe71ada3fe8b269fe9d726712",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_02.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_02.json
index 6f607af27b..af016bdf0a 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_02.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockHashAndIndex_02.json
@@ -24,6 +24,7 @@
       "raw": "0xf8641f018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0a849dc2c8f51ba0705b002a7df60707d33812e0298411721be20ea5a2f533707295140d89263b79a078024390784f24160739533b3ceea2698289a02afd9cc768581b4aa3d5f4b105",
       "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1b",
       "r": "0x705b002a7df60707d33812e0298411721be20ea5a2f533707295140d89263b79",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_00.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_00.json
index 7d5a82fa11..bbd00f86ec 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_00.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_00.json
@@ -24,6 +24,7 @@
       "raw": "0xf86401018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0a8412a7b9141ba0ed2e0f715eccaab4362c19c1cf35ad8031ab1cabe71ada3fe8b269fe9d726712a06691074f289f826d23c92808ae363959eb958fb7a91fc721875ece4958114c65",
       "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1b",
       "r": "0xed2e0f715eccaab4362c19c1cf35ad8031ab1cabe71ada3fe8b269fe9d726712",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_01.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_01.json
index 527d4f93a8..22315cbe85 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_01.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_01.json
@@ -24,6 +24,7 @@
       "raw": "0xf86402018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0a8457cb2fc41ba09dc3bf93e023b46d5d6d3ff2e62b06e10ba3877b8df69a408d8f8ec2ad8ea040a046c830e900919e5e0e6e48d413ad3f1f7906c6f0fe51c5d38431f3fe64622143",
       "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1b",
       "r": "0x9dc3bf93e023b46d5d6d3ff2e62b06e10ba3877b8df69a408d8f8ec2ad8ea040",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_latest.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_latest.json
index b4abc73595..08ecf768e5 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_latest.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_latest.json
@@ -24,6 +24,7 @@
       "raw": "0xf8641f018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0a849dc2c8f51ba0705b002a7df60707d33812e0298411721be20ea5a2f533707295140d89263b79a078024390784f24160739533b3ceea2698289a02afd9cc768581b4aa3d5f4b105",
       "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1b",
       "r": "0x705b002a7df60707d33812e0298411721be20ea5a2f533707295140d89263b79",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_pending.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_pending.json
index 74dc8a190e..2d1323ddcb 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_pending.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByBlockNumberAndIndex_pending.json
@@ -24,6 +24,7 @@
       "raw": "0xf8641f018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0a849dc2c8f51ba0705b002a7df60707d33812e0298411721be20ea5a2f533707295140d89263b79a078024390784f24160739533b3ceea2698289a02afd9cc768581b4aa3d5f4b105",
       "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1b",
       "r": "0x705b002a7df60707d33812e0298411721be20ea5a2f533707295140d89263b79",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_addressReceiver.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_addressReceiver.json
index 0ab9a032ce..799253c038 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_addressReceiver.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_addressReceiver.json
@@ -23,6 +23,7 @@
       "raw": "0xf8641d018304cb2f946295ee1b4f6dd65047762f924ecd367c17eabf8f0a84e8beef5b1ca011232cac2f935ab8dd5d5972438fde90e05d0dd620860b42886e7d54dc5c4a0ca03dd467b5faa6e5a0f3c22a5396fefa5b03f07d8114d8434e0e1493736aad8d0e",
       "to": "0x6295ee1b4f6dd65047762f924ecd367c17eabf8f",
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1c",
       "r": "0x11232cac2f935ab8dd5d5972438fde90e05d0dd620860b42886e7d54dc5c4a0c",
diff --git a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_contractCreation.json b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_contractCreation.json
index f17b810920..f05e5683c9 100644
--- a/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_contractCreation.json
+++ b/ethereum/api/src/test/resources/org/hyperledger/besu/ethereum/api/jsonrpc/eth/eth_getTransactionByHash_contractCreation.json
@@ -23,6 +23,7 @@
       "raw": "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",
       "to": null,
       "transactionIndex": "0x0",
+      "type" : "0x0",
       "value": "0xa",
       "v": "0x1c",
       "r": "0xe439aa8812c1c0a751b0931ea20c5a30cd54fe15cae883c59fd8107e04557679",
diff --git a/plugin-api/build.gradle b/plugin-api/build.gradle
index 28d5be47c8..e05dd1b0e0 100644
--- a/plugin-api/build.gradle
+++ b/plugin-api/build.gradle
@@ -64,7 +64,7 @@ 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 = 'A/wa5e1GoPd1zLXgvMVI4eo29rC42gy0Il1mV5ocy2U='
+  knownHash = '04i5t63zL2UxFKrdlfGMMt099SejaywYvtkgpn9jUE0='
 }
 check.dependsOn('checkAPIChanges')
 
diff --git a/plugin-api/src/main/java/org/hyperledger/besu/plugin/data/TransactionType.java b/plugin-api/src/main/java/org/hyperledger/besu/plugin/data/TransactionType.java
index b21d6526fe..985e22b722 100644
--- a/plugin-api/src/main/java/org/hyperledger/besu/plugin/data/TransactionType.java
+++ b/plugin-api/src/main/java/org/hyperledger/besu/plugin/data/TransactionType.java
@@ -19,7 +19,7 @@ import java.util.EnumSet;
 import java.util.Set;
 
 public enum TransactionType {
-  FRONTIER(0xf8 /* doesn't end up being used as we don't serialize legacy txs with their type */),
+  FRONTIER(0xf8 /* this is serialized as 0x0 in TransactionCompleteResult */),
   ACCESS_LIST(0x01),
   EIP1559(0x02);