Issues to Address                                                                                                                                    

  1. Index out of bounds risk (_process_batch_response:322-354)
  for i, result in enumerate(response):
      order = orders[i]
  1. If the API returns fewer results than orders submitted, this will raise IndexError. Should verify len(response) == len(orders) or use zip():
  for order, result in zip(orders, response, strict=True):
  2. Missing order state update for cancel methods (_cancel_all_global, _cancel_market_orders)

  2. These methods log cancellation results but don't update order state in the cache or generate cancel events. When orders are canceled via these
  endpoints, the local order state becomes stale. Consider:
    - Generating OrderCanceled events for successfully canceled orders
    - Or documenting that these are "fire and forget" methods requiring WebSocket updates
  3. Signing errors not handled (_sign_orders_for_batch)
  signed_order = await asyncio.to_thread(
      self._http_client.create_order,
      order_args,
      options=options,
  )
  3. If signing fails for one order, the entire batch fails with an unhandled exception. Consider wrapping in try/except and rejecting individual orders
  that fail to sign.
  4. expire_time_ns may be 0 (_sign_orders_for_batch:249)
  expiration=int(nanos_to_secs(order.expire_time_ns)),
  4. For GTC orders, expire_time_ns is typically 0. Verify that nanos_to_secs(0) = 0 is valid for the Polymarket API.

  📝 Minor Suggestions

  1. The _cancel_market_orders method has local imports that could be moved to module level for consistency:
  from nautilus_trader.adapters.polymarket.common.symbol import get_polymarket_condition_id
  from nautilus_trader.adapters.polymarket.common.symbol import get_polymarket_token_id
  1. These are already imported at the module level (lines 45-47).
  2. Consider adding a _reject_all_orders call if _sign_orders_for_batch raises an exception, to ensure orders don't get stuck in "submitted" state.