diff --git a/app/api/common/models.py b/app/api/common/models.py
index e43846a..ffe36e1 100644
--- a/app/api/common/models.py
+++ b/app/api/common/models.py
@@ -223,7 +223,11 @@ def get_by_near_intents_id(cls, near_intents_id: str):
     def to_spec(self) -> ChainSpec:
         return ChainSpec(coin=self.coin, chain_id=self.chain_id)
 
-    def __eq__(self, other: Chain) -> bool:
+    def __eq__(self, other) -> bool:
+        if other is None:
+            return False
+        if not isinstance(other, Chain):
+            return False
         return self.coin == other.coin and self.chain_id == other.chain_id
 
     def __str__(self):
diff --git a/app/api/common/test_models.py b/app/api/common/test_models.py
new file mode 100644
index 0000000..82ce736
--- /dev/null
+++ b/app/api/common/test_models.py
@@ -0,0 +1,67 @@
+import pytest
+
+from app.api.common.models import Chain, Coin
+
+
+@pytest.mark.parametrize(
+    "comparison_chain",
+    [Chain.BITCOIN, Chain.ETHEREUM, Chain.SOLANA, Chain.CARDANO],
+)
+def test_chain_get_returns_none_comparison(comparison_chain):
+    chain = Chain.get("INVALID_COIN", "invalid_chain_id")
+    assert chain is None
+    assert (chain == comparison_chain) is False
+
+
+@pytest.mark.parametrize(
+    "chain,other_object",
+    [
+        (Chain.BITCOIN, "bitcoin"),
+        (Chain.ETHEREUM, 1),
+        (Chain.SOLANA, Coin.BTC),
+        (Chain.BITCOIN, {"coin": "BTC"}),
+        (Chain.ETHEREUM, []),
+        (Chain.SOLANA, None),
+    ],
+)
+def test_chain_equals_non_chain_object_returns_false(chain, other_object):
+    assert (chain == other_object) is False
+
+
+@pytest.mark.parametrize(
+    "coin,chain_id,expected_chain,different_chain",
+    [
+        ("BTC", "bitcoin_mainnet", Chain.BITCOIN, Chain.ETHEREUM),
+        ("ETH", "0x1", Chain.ETHEREUM, Chain.SOLANA),
+        ("SOL", "0x65", Chain.SOLANA, Chain.BITCOIN),
+        ("ADA", "cardano_mainnet", Chain.CARDANO, Chain.FILECOIN),
+    ],
+)
+def test_chain_get_valid_chain_comparison(
+    coin, chain_id, expected_chain, different_chain
+):
+    chain = Chain.get(coin, chain_id)
+    assert chain is not None
+    assert chain == expected_chain
+    # Verify it's not equal to a different chain
+    assert (chain == different_chain) is False
+    assert chain != different_chain
+
+
+def test_chain_equality_with_case_insensitive_chain_id():
+    chain1 = Chain.get("BTC", "BITCOIN_MAINNET")
+    chain2 = Chain.get("btc", "bitcoin_mainnet")
+    assert chain1 == chain2
+    assert chain1 == Chain.BITCOIN
+    assert chain2 == Chain.BITCOIN
+
+
+@pytest.mark.parametrize("chain", list(Chain))
+def test_all_chains(chain):
+    assert (chain is None) is False
+    none = None
+    assert (none == chain) is False
+
+    assert chain == chain
+    assert chain is chain
+    assert chain is not None
diff --git a/app/api/oauth/zebpay.py b/app/api/oauth/zebpay.py
index 73af213..327449a 100644
--- a/app/api/oauth/zebpay.py
+++ b/app/api/oauth/zebpay.py
@@ -1,8 +1,9 @@
+from urllib.parse import parse_qs, urlencode
+
 import httpx
 from fastapi import APIRouter, HTTPException, Request
 from fastapi.responses import JSONResponse, RedirectResponse
 from starlette.datastructures import URL
-from urllib.parse import parse_qs, urlencode
 
 from app.api.common.models import Tags
 from app.api.oauth.models import Environment
diff --git a/app/api/swap/providers/jupiter/client.py b/app/api/swap/providers/jupiter/client.py
index 3b9118e..8730ec6 100644
--- a/app/api/swap/providers/jupiter/client.py
+++ b/app/api/swap/providers/jupiter/client.py
@@ -158,7 +158,9 @@ async def _get_order(
             self._handle_error_response(response)
             # _handle_error_response is expected to always raise SwapError,
             # but add an explicit raise to make the control flow clear.
-            raise SwapError(message="Unhandled Jupiter API error", kind=SwapErrorKind.UNKNOWN)
+            raise SwapError(
+                message="Unhandled Jupiter API error", kind=SwapErrorKind.UNKNOWN
+            )
 
     async def get_indicative_routes(
         self,
diff --git a/pyproject.toml b/pyproject.toml
index 1bc8f26..1173677 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "gate3"
-version = "0.11.0"
+version = "0.11.1"
 description = "Gate API for web3 applications at Brave"
 authors = [
 ]