diff --git a/pyproject.toml b/pyproject.toml
index e9df25e..e89f2c6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "vertex-protocol"
-version = "1.1.19"
+version = "1.1.20"
 description = "Vertex Protocol SDK"
 authors = ["Jeury Mejia <jeury@vertexprotocol.com>"]
 homepage = "https://vertexprotocol.com/"
diff --git a/tests/vertex_client/test_create_vertex_client.py b/tests/vertex_client/test_create_vertex_client.py
index 3a7eb98..7efb00c 100644
--- a/tests/vertex_client/test_create_vertex_client.py
+++ b/tests/vertex_client/test_create_vertex_client.py
@@ -132,22 +132,45 @@ def test_create_vertex_client(
     assert mainnet_vertex_client.context.indexer_client.url == VertexBackendURL.MAINNET
     assert mainnet_vertex_client.context.engine_client.signer == signer
 
-    testnet_vertex_client = create_vertex_client(
+    sepolia_testnet_vertex_client = create_vertex_client(
         VertexClientMode.SEPOLIA_TESTNET, signer
     )
 
-    assert testnet_vertex_client.context.engine_client.chain_id == chain_id
-    assert testnet_vertex_client.context.engine_client.endpoint_addr == endpoint_addr
-    assert testnet_vertex_client.context.engine_client.book_addrs == book_addrs
+    assert sepolia_testnet_vertex_client.context.engine_client.chain_id == chain_id
     assert (
-        testnet_vertex_client.context.engine_client.url
+        sepolia_testnet_vertex_client.context.engine_client.endpoint_addr
+        == endpoint_addr
+    )
+    assert sepolia_testnet_vertex_client.context.engine_client.book_addrs == book_addrs
+    assert (
+        sepolia_testnet_vertex_client.context.engine_client.url
         == VertexBackendURL.SEPOLIA_TESTNET
     )
     assert (
-        testnet_vertex_client.context.indexer_client.url
+        sepolia_testnet_vertex_client.context.indexer_client.url
         == VertexBackendURL.SEPOLIA_TESTNET
     )
-    assert testnet_vertex_client.context.engine_client.signer == signer
+    assert sepolia_testnet_vertex_client.context.engine_client.signer == signer
+
+    mantle_testnet_vertex_client = create_vertex_client(
+        VertexClientMode.MANTLE_TESTNET, signer
+    )
+
+    assert mantle_testnet_vertex_client.context.engine_client.chain_id == chain_id
+    assert (
+        mantle_testnet_vertex_client.context.engine_client.endpoint_addr
+        == endpoint_addr
+    )
+    assert mantle_testnet_vertex_client.context.engine_client.book_addrs == book_addrs
+    assert (
+        mantle_testnet_vertex_client.context.engine_client.url
+        == VertexBackendURL.MANTLET_TESTNET
+    )
+    assert (
+        mantle_testnet_vertex_client.context.indexer_client.url
+        == VertexBackendURL.MANTLET_TESTNET
+    )
+    assert mantle_testnet_vertex_client.context.engine_client.signer == signer
 
     devnet_vertex_client = create_vertex_client(VertexClientMode.TESTING, signer)
 
diff --git a/vertex_protocol/client/__init__.py b/vertex_protocol/client/__init__.py
index 9da9ed3..8c76501 100644
--- a/vertex_protocol/client/__init__.py
+++ b/vertex_protocol/client/__init__.py
@@ -28,6 +28,8 @@ class VertexClientMode(StrEnum):
 
         SEPOLIA_TESTNET: For operating in Vertex's testnet environment deployed on Arbitrum Sepolia.
 
+        MANTLE_TESTNET: For operating in Vertex's testnet environment deployed on Mantle Goerli.
+
         DEVNET: For local development.
 
         TESTING: For running tests.
@@ -35,6 +37,7 @@ class VertexClientMode(StrEnum):
 
     MAINNET = "mainnet"
     SEPOLIA_TESTNET = "sepolia-testnet"
+    MANTLE_TESTNET = "mantle-testnet"
     DEVNET = "devnet"
     TESTING = "testing"
 
@@ -101,6 +104,7 @@ def create_vertex_client(
         mode (VertexClientMode): The mode in which to operate the client. Can be one of the following:
             VertexClientMode.MAINNET: For operating in Vertex's mainnet environment deployed on Arbitrum One.
             VertexClientMode.SEPOLIA_TESTNET: For operating in Vertex's testnet environment deployed on Arbitrum Sepolia.
+            VertexClientMode.MANTLE_TESTNET: For operating in Vertex's testnet environment deployed on Mantle Goerli.
             VertexClientMode.DEVNET: For local development.
 
         signer (Signer, optional): An instance of LocalAccount or a private key string for signing transactions.
@@ -114,9 +118,11 @@ def create_vertex_client(
     logging.info(f"Initializing default {mode} context")
     engine_endpoint_url, indexer_endpoint_url, network_name = client_mode_to_setup(mode)
     try:
-        deployment = load_deployment(VertexNetwork(network_name))
+        network = VertexNetwork(network_name)
+        deployment = load_deployment(network)
         rpc_node_url = deployment.node_url
         contracts_context = VertexContractsContext(
+            network=network,
             endpoint_addr=deployment.endpoint_addr,
             querier_addr=deployment.querier_addr,
             perp_engine_addr=deployment.perp_engine_addr,
@@ -168,6 +174,11 @@ def client_mode_to_setup(
                 VertexBackendURL.MAINNET.value,
                 VertexNetwork.ARBITRUM_ONE.value,
             ),
+            VertexClientMode.MANTLE_TESTNET: (
+                VertexBackendURL.MANTLET_TESTNET.value,
+                VertexBackendURL.MANTLET_TESTNET.value,
+                VertexNetwork.MANTLE_GOERLI.value,
+            ),
             VertexClientMode.SEPOLIA_TESTNET: (
                 VertexBackendURL.SEPOLIA_TESTNET.value,
                 VertexBackendURL.SEPOLIA_TESTNET.value,
diff --git a/vertex_protocol/contracts/__init__.py b/vertex_protocol/contracts/__init__.py
index 3cf2439..0b33f34 100644
--- a/vertex_protocol/contracts/__init__.py
+++ b/vertex_protocol/contracts/__init__.py
@@ -34,6 +34,7 @@ class VertexContractsContext(BaseModel):
         clearinghouse_addr (Optional[str]): The clearinghouse address. This may be None.
     """
 
+    network: Optional[VertexNetwork]
     endpoint_addr: str
     querier_addr: str
     spot_engine_addr: Optional[str]
@@ -47,6 +48,7 @@ class VertexContracts:
     """
 
     w3: Web3
+    network: Optional[VertexNetwork]
     contracts_context: VertexContractsContext
     querier: Contract
     endpoint: Contract
@@ -66,6 +68,7 @@ def __init__(self, node_url: str, contracts_context: VertexContractsContext):
 
             contracts_context (VertexContractsContext): The Vertex contracts context, holding the relevant addresses.
         """
+        self.network = contracts_context.network
         self.w3 = Web3(Web3.HTTPProvider(node_url))
 
         self.contracts_context = VertexContractsContext.parse_obj(contracts_context)
@@ -223,7 +226,11 @@ def _build_tx_params(self, signer: LocalAccount) -> TxParams:
             "from": signer.address,
             "nonce": self.w3.eth.get_transaction_count(signer.address),
         }
-        if os.getenv("CLIENT_MODE") == "devnet":
+        needs_gas_price = self.network is not None and self.network.value in [
+            VertexNetwork.HARDHAT.value,
+            VertexNetwork.MANTLE_GOERLI.value,
+        ]
+        if needs_gas_price or os.getenv("CLIENT_MODE") in ["devnet"]:
             tx_params["gasPrice"] = self.w3.eth.gas_price
         return tx_params
 
diff --git a/vertex_protocol/contracts/deployments/deployment.mantleGoerli.json b/vertex_protocol/contracts/deployments/deployment.mantleGoerli.json
new file mode 100644
index 0000000..36c0658
--- /dev/null
+++ b/vertex_protocol/contracts/deployments/deployment.mantleGoerli.json
@@ -0,0 +1,14 @@
+{
+  "publicNodeUrl": "https://mantle-goerli.public.blastapi.io",
+  "explorerUrl": "https://explorer.testnet.mantle.xyz/",
+  "startBlock": 26921136,
+  "deployer": "0x3c06e307BA6Ab81E8Ff6661c1559ce8027744AE5",
+  "quote": "0xA7Fcb606611358afa388b6bd23b3B2F2c6abEd82",
+  "querier": "0x6f5F5d9Cb93062dd1d684c6694Fee7bbBE94eD6B",
+  "feeCalculator": "0xA1DbC395Cbaa8c7b74456697C42ADa8F2b08CAbb",
+  "clearinghouse": "0x1a77cB939B7C4fA5Cc90b09787260DABf5f05c41",
+  "endpoint": "0xB61B069d741C98DA3302986BF107aA9083b64133",
+  "spotEngine": "0xEC1149dF1559eaDB0Af4cf6d9BeAc7a08Aa9f694",
+  "perpEngine": "0x19a4B178654F42Ea994347D514ED9E4f99221Ba2",
+  "arbAirdrop": "0x0000000000000000000000000000000000000000"
+}
diff --git a/vertex_protocol/contracts/types.py b/vertex_protocol/contracts/types.py
index b42d9ef..c2316fe 100644
--- a/vertex_protocol/contracts/types.py
+++ b/vertex_protocol/contracts/types.py
@@ -12,6 +12,7 @@ class VertexNetwork(StrEnum):
 
     ARBITRUM_ONE = "arbitrumOne"
     ARBITRUM_SEPOLIA = "arbitrumSepolia"
+    MANTLE_GOERLI = "mantleGoerli"
     HARDHAT = "localhost"
     TESTING = "test"
 
diff --git a/vertex_protocol/utils/backend.py b/vertex_protocol/utils/backend.py
index c99e103..4f1448c 100644
--- a/vertex_protocol/utils/backend.py
+++ b/vertex_protocol/utils/backend.py
@@ -4,6 +4,7 @@
 class VertexBackendURL(StrEnum):
     """Enum representing different Vertex backend URLs."""
 
+    MANTLET_TESTNET = "https://api.mantle-test.vertexprotocol.com"
     SEPOLIA_TESTNET = "https://api.sepolia-test.vertexprotocol.com"
     MAINNET = "https://api.prod.vertexprotocol.com"
     DEVNET_ENGINE = "http://localhost:80"