diff --git a/accounts/external/backend.go b/accounts/external/backend.go
index 42eaf661cc..daf5994c59 100644
--- a/accounts/external/backend.go
+++ b/accounts/external/backend.go
@@ -235,6 +235,9 @@ func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transactio
 		accessList := tx.AccessList()
 		args.AccessList = &accessList
 	}
+	if tx.Type() == types.SetCodeTxType {
+		args.AuthorizationList = tx.SetCodeAuthorizations()
+	}
 	if tx.Type() == types.BlobTxType {
 		args.BlobHashes = tx.BlobHashes()
 		sidecar := tx.BlobTxSidecar()
diff --git a/signer/core/apitypes/types.go b/signer/core/apitypes/types.go
index ee12bb263e..7dfc10958f 100644
--- a/signer/core/apitypes/types.go
+++ b/signer/core/apitypes/types.go
@@ -103,6 +103,9 @@ type SendTxArgs struct {
 	AccessList *types.AccessList `json:"accessList,omitempty"`
 	ChainID    *hexutil.Big      `json:"chainId,omitempty"`
 
+	// For SetCodeTxType
+	AuthorizationList []types.SetCodeAuthorization `json:"authorizationList,omitempty"`
+
 	// For BlobTxType
 	BlobFeeCap *hexutil.Big  `json:"maxFeePerBlobGas,omitempty"`
 	BlobHashes []common.Hash `json:"blobVersionedHashes,omitempty"`
@@ -175,6 +178,24 @@ func (args *SendTxArgs) ToTransaction() (*types.Transaction, error) {
 			data.(*types.BlobTx).Sidecar = types.NewBlobTxSidecar(version, args.Blobs, args.Commitments, args.Proofs)
 		}
 
+	case args.AuthorizationList != nil:
+		al := types.AccessList{}
+		if args.AccessList != nil {
+			al = *args.AccessList
+		}
+		data = &types.SetCodeTx{
+			To:         *to,
+			ChainID:    uint256.MustFromBig((*big.Int)(args.ChainID)),
+			Nonce:      uint64(args.Nonce),
+			Gas:        uint64(args.Gas),
+			GasFeeCap:  uint256.MustFromBig((*big.Int)(args.MaxFeePerGas)),
+			GasTipCap:  uint256.MustFromBig((*big.Int)(args.MaxPriorityFeePerGas)),
+			Value:      uint256.MustFromBig((*big.Int)(&args.Value)),
+			Data:       args.data(),
+			AccessList: al,
+			AuthList:   args.AuthorizationList,
+		}
+
 	case args.MaxFeePerGas != nil:
 		al := types.AccessList{}
 		if args.AccessList != nil {
diff --git a/signer/core/apitypes/types_test.go b/signer/core/apitypes/types_test.go
index f010cef207..68cb89ab47 100644
--- a/signer/core/apitypes/types_test.go
+++ b/signer/core/apitypes/types_test.go
@@ -109,6 +109,27 @@ func TestTxArgs(t *testing.T) {
 	*/
 }
 
+func TestTxArgsSetCodeTx(t *testing.T) {
+	data := []byte(`{"from":"0x1b442286e32ddcaa6e2570ce9ed85f4b4fc87425","authorizationList":[{"chainId":"0x7","address":"0x0000000000000000000000000000000000000001","nonce":"0x1","yParity":"0x0","r":"0x1","s":"0x2"}],"accessList":[],"chainId":"0x7","gas":"0x124f8","input":"0x","maxFeePerGas":"0x6fc23ac00","maxPriorityFeePerGas":"0x3b9aca00","nonce":"0x0","to":"0x1b442286e32ddcaa6e2570ce9ed85f4b4fc87425","value":"0x0"}`)
+
+	var txArgs SendTxArgs
+	if err := json.Unmarshal(data, &txArgs); err != nil {
+		t.Fatal(err)
+	}
+	tx, err := txArgs.ToTransaction()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if have := tx.Type(); have != types.SetCodeTxType {
+		t.Fatalf("have tx type %d, want %d", have, types.SetCodeTxType)
+	}
+	if have := tx.SetCodeAuthorizations(); len(have) != 1 {
+		t.Fatalf("have %d authorizations, want 1", len(have))
+	} else if have[0] != txArgs.AuthorizationList[0] {
+		t.Fatalf("authorization mismatch: have %#v, want %#v", have[0], txArgs.AuthorizationList[0])
+	}
+}
+
 func TestBlobTxs(t *testing.T) {
 	blob := kzg4844.Blob{0x1}
 	commitment, err := kzg4844.BlobToCommitment(&blob)