diff --git a/pycardano/backend/blockfrost.py b/pycardano/backend/blockfrost.py
index 4f475baa..40c9ccc7 100644
--- a/pycardano/backend/blockfrost.py
+++ b/pycardano/backend/blockfrost.py
@@ -90,7 +90,7 @@ def __init__(
         )
 
         # Set network value to mainnet if base_url contains "mainnet".
-        if "mainnet" in self._base_url.value:
+        if "mainnet" in self._base_url:
             self._network = Network.MAINNET
 
         self.api = BlockFrostApi(project_id=self._project_id, base_url=self._base_url)
diff --git a/test/pycardano/backend/test_blockfrost.py b/test/pycardano/backend/test_blockfrost.py
new file mode 100644
index 00000000..5dcb2cbb
--- /dev/null
+++ b/test/pycardano/backend/test_blockfrost.py
@@ -0,0 +1,22 @@
+from unittest.mock import MagicMock, patch
+
+from blockfrost import ApiUrls
+
+from pycardano.backend.blockfrost import BlockFrostChainContext
+from pycardano.network import Network
+
+
+@patch("pycardano.backend.blockfrost.BlockFrostApi")
+def test_blockfrost_chain_context(mock_api):
+    mock_api.return_value = MagicMock()
+    chain_context = BlockFrostChainContext("project_id", base_url=ApiUrls.mainnet.value)
+    assert chain_context.network == Network.MAINNET
+
+    chain_context = BlockFrostChainContext("project_id", base_url=ApiUrls.testnet.value)
+    assert chain_context.network == Network.TESTNET
+
+    chain_context = BlockFrostChainContext("project_id", base_url=ApiUrls.preprod.value)
+    assert chain_context.network == Network.TESTNET
+
+    chain_context = BlockFrostChainContext("project_id", base_url=ApiUrls.preview.value)
+    assert chain_context.network == Network.TESTNET