diff --git a/intentkit/utils/chain.py b/intentkit/utils/chain.py
index ed2bb7fa..3c508142 100644
--- a/intentkit/utils/chain.py
+++ b/intentkit/utils/chain.py
@@ -159,6 +159,14 @@ class NetworkId(IntEnum):
     BeraMainnet = 80094
 
 
+# QuickNode may return short chain/network identifiers that map to existing enums.
+QUICKNODE_CHAIN_ALIASES: dict[str, str] = {
+    "arb": Chain.Arbitrum.value,
+}
+QUICKNODE_NETWORK_ALIASES: dict[str, str] = {
+    "optimism": QuickNodeNetwork.OptimismMainnet.value,
+}
+
 # Mapping of QuickNodeNetwork enum members to their corresponding NetworkId enum members.
 # This dictionary facilitates efficient lookup of network IDs given a network name.
 # Note: SolanaMainnet is intentionally excluded as it does not have a numeric chain ID.
@@ -517,9 +525,13 @@ def init_chain_configs(self, limit: int = 100, offset: int = 0) -> None:
                 continue
 
             try:
-                chain_value = item["chain"]
-                network_value = item["network"]
+                chain_value = str(item["chain"]).lower()
+                network_value = str(item["network"]).lower()
                 rpc_url = item["http_url"]
+                chain_value = QUICKNODE_CHAIN_ALIASES.get(chain_value, chain_value)
+                network_value = QUICKNODE_NETWORK_ALIASES.get(
+                    network_value, network_value
+                )
                 chain = Chain(chain_value)
                 network = QuickNodeNetwork(network_value)
                 ens_url = item.get("ens_url", rpc_url)
diff --git a/tests/utils/test_chain.py b/tests/utils/test_chain.py
index 93f19101..00e219ec 100644
--- a/tests/utils/test_chain.py
+++ b/tests/utils/test_chain.py
@@ -1,10 +1,12 @@
 import pytest
 
+import intentkit.utils.chain as chain_utils
 from intentkit.utils.chain import (
     Chain,
     ChainConfig,
     ChainProvider,
     NetworkId,
+    QuicknodeChainProvider,
     QuickNodeNetwork,
 )
 
@@ -26,6 +28,31 @@ def init_chain_configs(self, api_key: str = ""):
         self.api_key = api_key
 
 
+class DummyResponse:
+    def __init__(self, payload: dict[str, list[dict[str, str]]]):
+        self._payload = payload
+
+    def raise_for_status(self) -> None:
+        return None
+
+    def json(self) -> dict[str, list[dict[str, str]]]:
+        return self._payload
+
+
+class DummyClient:
+    def __init__(self, payload: dict[str, list[dict[str, str]]]):
+        self._payload = payload
+
+    def __enter__(self) -> "DummyClient":
+        return self
+
+    def __exit__(self, exc_type, exc, traceback) -> None:
+        return None
+
+    def get(self, *_, **__) -> DummyResponse:
+        return DummyResponse(self._payload)
+
+
 def test_chain_config_properties():
     config = ChainConfig(
         chain=Chain.Ethereum,
@@ -53,6 +80,34 @@ def test_chain_provider_fetch_by_network_and_id():
     assert config_by_id is config
 
 
+def test_quicknode_chain_provider_alias_mapping(monkeypatch: pytest.MonkeyPatch):
+    # QuickNode can return chain "arb" with network "optimism"; both should map.
+    payload = {
+        "data": [
+            {
+                "chain": "arb",
+                "network": "optimism",
+                "http_url": "https://quicknode",
+                "ens_url": "https://ens",
+                "wss_url": "wss://quicknode",
+            }
+        ]
+    }
+
+    monkeypatch.setattr(
+        chain_utils.httpx,
+        "Client",
+        lambda *_, **__: DummyClient(payload),
+    )
+
+    provider = QuicknodeChainProvider("test-key")
+    provider.init_chain_configs()
+
+    config = provider.chain_configs[QuickNodeNetwork.OptimismMainnet]
+    assert config.chain is Chain.Arbitrum
+    assert config.network is QuickNodeNetwork.OptimismMainnet
+
+
 def test_chain_provider_missing_network():
     provider = DummyChainProvider()