outside_rth parameter silently overridden to RTHOnly for US options orders

[py77]

Summary

When submitting US options orders via the Python SDK, the outside_rth parameter is silently overridden to OutsideRTH.RTHOnly regardless of the value passed (AnyTime or Overnight). No error is returned — the order is accepted but the session type is changed server-side.

Context

Longbridge launched pre-market US options trading on Jan 22, 2026, supporting tickers including AMZN, AAPL, SPY, QQQ, etc. We are trying to place pre-market option orders via the OpenAPI SDK.

Steps to Reproduce

from decimal import Decimal
from longport.openapi import (
    TradeContext, Config, OrderSide, OrderType,
    TimeInForceType, OutsideRTH
)

ctx = TradeContext(Config.from_env())

# Attempt 1: AnyTime
resp = ctx.submit_order(
    symbol="AMZN260320P190000.US",
    order_type=OrderType.LO,
    side=OrderSide.Sell,
    submitted_quantity=Decimal(1),
    submitted_price=Decimal("1.37"),
    time_in_force=TimeInForceType.Day,
    outside_rth=OutsideRTH.AnyTime,  # <-- passed AnyTime
)

detail = ctx.order_detail(resp.order_id)
print(detail.outside_rth)  # OutsideRTH.RTHOnly  <-- server overrode to RTHOnly

# Attempt 2: Overnight
resp2 = ctx.submit_order(
    symbol="AMZN260320P190000.US",
    order_type=OrderType.LO,
    side=OrderSide.Sell,
    submitted_quantity=Decimal(1),
    submitted_price=Decimal("2.50"),
    time_in_force=TimeInForceType.Day,
    outside_rth=OutsideRTH.Overnight,  # <-- passed Overnight
)

detail2 = ctx.order_detail(resp2.order_id)
print(detail2.outside_rth)  # OutsideRTH.RTHOnly  <-- also overridden

Expected Behavior

The order should retain the outside_rth value passed in the request (either AnyTime or Overnight), allowing the order to be eligible for pre-market options trading (4:00 AM – 9:30 AM ET).

If the value is not supported for options, the API should return an error rather than silently overriding it.

Actual Behavior

• OutsideRTH.AnyTime → silently changed to OutsideRTH.RTHOnly
• OutsideRTH.Overnight → silently changed to OutsideRTH.RTHOnly
• No error returned, order accepted with 200 OK

Questions

1. Which OutsideRTH value should be used for pre-market US options orders?
2. Is there an account-level permission that needs to be enabled for pre-market options via API?
3. Is pre-market options trading supported through the OpenAPI at all, or only via the app UI?

Environment

• Python SDK: longport (latest pip version)
• Platform: Docker (Python 3.12, Linux x86_64)
• Account region: Hong Kong