From e622c11e26aa44230e72bb9b83da923ffda8dc2d Mon Sep 17 00:00:00 2001
From: skyc1e <palkin.dominik@gmail.com>
Date: Wed, 1 Apr 2026 22:32:13 +0200
Subject: [PATCH] feat(transaction-controller): add EIP-4844 blob transaction
 type (0x03)

Add `blob = '0x3'` to the `TransactionEnvelopeType` enum so that
EIP-4844 blob-carrying transactions are no longer rejected by
validation. Blob transactions use EIP-1559 fee market parameters,
so the type is also added to `TRANSACTION_ENVELOPE_TYPES_FEE_MARKET`.

Closes MetaMask/core#8331
---
 packages/transaction-controller/src/types.ts              | 8 ++++++++
 .../transaction-controller/src/utils/validation.test.ts   | 4 ++--
 packages/transaction-controller/src/utils/validation.ts   | 1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/packages/transaction-controller/src/types.ts b/packages/transaction-controller/src/types.ts
index 3282ce2cebb..9da2656b1b8 100644
--- a/packages/transaction-controller/src/types.ts
+++ b/packages/transaction-controller/src/types.ts
@@ -1321,6 +1321,14 @@ export enum TransactionEnvelopeType {
    */
   feeMarket = '0x2',
 
+  /**
+   * EIP-4844 defined the blob transaction type that allows for submitting
+   * binary large objects (blobs) to be persisted in the beacon node for a
+   * limited period of time. Blob transactions use EIP-1559 fee market
+   * parameters plus an additional `maxFeePerBlobGas` field.
+   */
+  blob = '0x3',
+
   /**
    * Adds code to externally owned accounts according to the signed authorizations
    * in the new `authorizationList` parameter.
diff --git a/packages/transaction-controller/src/utils/validation.test.ts b/packages/transaction-controller/src/utils/validation.test.ts
index 05e1b802160..918c5c6878e 100644
--- a/packages/transaction-controller/src/utils/validation.test.ts
+++ b/packages/transaction-controller/src/utils/validation.test.ts
@@ -44,9 +44,9 @@ describe('validation', () => {
   describe('validateTxParams', () => {
     it('should throw if unknown transaction envelope type is specified', () => {
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      expect(() => validateTxParams({ type: '0x3' } as any)).toThrow(
+      expect(() => validateTxParams({ type: '0x5' } as any)).toThrow(
         rpcErrors.invalidParams(
-          'Invalid transaction envelope type: "0x3". Must be one of: 0x0, 0x1, 0x2, 0x4',
+          'Invalid transaction envelope type: "0x5". Must be one of: 0x0, 0x1, 0x2, 0x3, 0x4',
         ),
       );
     });
diff --git a/packages/transaction-controller/src/utils/validation.ts b/packages/transaction-controller/src/utils/validation.ts
index 203aaf075a0..4a30ac52bc9 100644
--- a/packages/transaction-controller/src/utils/validation.ts
+++ b/packages/transaction-controller/src/utils/validation.ts
@@ -21,6 +21,7 @@ export enum ErrorCode {
 
 const TRANSACTION_ENVELOPE_TYPES_FEE_MARKET = [
   TransactionEnvelopeType.feeMarket,
+  TransactionEnvelopeType.blob,
   TransactionEnvelopeType.setCode,
 ];