diff --git a/operate/cli.py b/operate/cli.py
index 6394fef3e..a350cf35c 100644
--- a/operate/cli.py
+++ b/operate/cli.py
@@ -95,7 +95,7 @@ def master_wallet_manager(self) -> MasterWalletManager:
             password=self.password,
         )
         manager.setup()
-        return JSONResponse(content=manager)
+        return manager
 
     def setup(self) -> None:
         """Make the root directory."""
@@ -230,7 +230,7 @@ async def _validate_password(request: Request) -> t.Dict:
 
         operate.password = data["password"]
         return JSONResponse(
-            content={"error": "Login successful"},
+            content={"message": "Login successful"},
             status_code=200,
         )
 
@@ -264,8 +264,14 @@ async def _create_wallet(request: Request) -> t.List[t.Dict]:
         ledger_type = get_ledger_type_from_chain_type(chain=chain_type)
         manager = operate.master_wallet_manager
         if manager.exists(ledger_type=ledger_type):
-            return JSONResponse(content=manager.load(ledger_type=ledger_type).json)
-        return JSONResponse(content=manager.create(ledger_type=ledger_type).json)
+            return JSONResponse(
+                content={
+                    "wallet": manager.load(ledger_type=ledger_type).json,
+                    "mnemonic": None,
+                }
+            )
+        wallet, mnemonic = manager.create(ledger_type=ledger_type)
+        return JSONResponse(content={"wallet": wallet.json, "mnemonic": mnemonic})
 
     @app.put("/api/wallet")
     @with_retries
@@ -288,7 +294,7 @@ async def _create_wallet(request: Request) -> t.List[t.Dict]:
         ledger_type = get_ledger_type_from_chain_type(chain=chain_type)
         manager = operate.master_wallet_manager
         if not manager.exists(ledger_type=ledger_type):
-            return JSONResponse(content=wallet)
+            return JSONResponse(content={"error": "Wallet does not exist"})
 
         wallet = manager.load(ledger_type=ledger_type)
         wallet.create_safe(chain_type=chain_type, owner=data.get("owner"))
diff --git a/operate/wallet/master.py b/operate/wallet/master.py
index f4f067ac4..5be72559e 100644
--- a/operate/wallet/master.py
+++ b/operate/wallet/master.py
@@ -6,6 +6,8 @@
 from aea.crypto.registries import make_crypto, make_ledger_api
 from aea_ledger_ethereum.ethereum import EthereumCrypto
 from autonomy.chain.base import registry_contracts
+from mnemonic import Mnemonic
+from web3 import Account
 
 from operate.ledger import get_default_rpc, get_ledger_type_from_chain_type
 from operate.resource import LocalResource
@@ -56,7 +58,7 @@ def ledger_api(
         )
 
     @staticmethod
-    def new(password: str, path: Path) -> "MasterWallet":
+    def new(password: str, path: Path) -> t.Tuple["MasterWallet", t.List[str]]:
         """Create a new master wallet."""
         raise NotImplementedError()
 
@@ -94,16 +96,22 @@ def get_crypto_obj(self, password: str) -> EthereumCrypto:
         )
 
     @classmethod
-    def new(cls, password: str, path: Path) -> "EthereumMasterWallet":
+    def new(
+        cls, password: str, path: Path
+    ) -> t.Tuple["EthereumMasterWallet", t.List[str]]:
         """Create a new master wallet."""
+        # Enable support for creating account using mnemonics
+        Account.enable_unaudited_hdwallet_features()
+
         # Create crypto object and store using password
         crypto = make_crypto("ethereum")
+        crypto._entity, mnemonic = Account.create_with_mnemonic()
         crypto.dump(private_key_file=path / cls._key, password=password)
 
         # Create wallet
         wallet = EthereumMasterWallet(path=path, address=crypto.address, safe_chains=[])
         wallet.store()
-        return wallet
+        return wallet, mnemonic.split()
 
     def create_safe(
         self,
@@ -164,7 +172,7 @@ def setup(self) -> "MasterWalletManager":
         self.path.mkdir(exist_ok=True)
         return self
 
-    def create(self, ledger_type: LedgerType) -> MasterWallet:
+    def create(self, ledger_type: LedgerType) -> t.Tuple[MasterWallet, t.List[str]]:
         """
         Create a master wallet