fix(python): remove nest-asyncio dependency for Python 3.12+ compatibility

python/cdp/evm_local_account.py

@@ -1,7 +1,7 @@
 import asyncio
+from concurrent.futures import ThreadPoolExecutor
 from typing import Any
 
-import nest_asyncio
 from eth_account.datastructures import SignedMessage, SignedTransaction
 from eth_account.messages import SignableMessage, _hash_eip191_message, encode_typed_data
 from eth_account.signers.base import BaseAccount
@@ -11,35 +11,28 @@
 from cdp.errors import UserInputValidationError
 from cdp.evm_server_account import EvmServerAccount
 
-# Apply nest-asyncio to allow nested event loops, but only if compatible
-try:
-    nest_asyncio.apply()
-except ValueError as e:
-    # If nest_asyncio can't patch the loop (e.g., uvloop), silently continue
-    # This commonly happens when uvloop is installed and running
-    if "Can't patch loop" in str(e):
-        pass
-    else:
-        # Re-raise other ValueError exceptions
-        raise
-
 
 def _run_async(coroutine):
     """Run an async coroutine synchronously.
 
+    If no event loop is running, asyncio.run is used directly.
+    If an event loop is already running, the coroutine is executed
+    in a background thread to avoid nested loop issues.
+
     Args:
-        coroutine: The coroutine to run
+        coroutine: The coroutine to run.
 
     Returns:
-        Any: The result of the coroutine
+        Any: The result of the coroutine.
 
     """
     try:
-        loop = asyncio.get_event_loop()
+        asyncio.get_running_loop()
     except RuntimeError:
-        loop = asyncio.new_event_loop()
-        asyncio.set_event_loop(loop)
-    return loop.run_until_complete(coroutine)
+        return asyncio.run(coroutine)
+
+    with ThreadPoolExecutor(max_workers=1) as executor:
+        return executor.submit(asyncio.run, coroutine).result()
 
 
 class EvmLocalAccount(BaseAccount):

python/changelog.d/591.bugfix.md

@@ -0,0 +1 @@
+Removed `nest-asyncio` dependency and replaced it with a thread-safe fallback in `EvmLocalAccount`, restoring compatibility with Python 3.12+ and modern uvicorn.

python/pyproject.toml

@@ -17,7 +17,6 @@ dependencies = [
     "web3>=7.6.0,<=7.10.0",
     "solana>=0.36.6",
     "solders>=0.26.0",
-    "nest-asyncio>=1.6.0,<2",
     "base58>=2.1.1",
 ]