HTX to Roll Out API Upgrade for USDT-M Futures Trading System

Dear HTX Users, To enhance the quality and performance of our futures trading services, HTX will conduct a comprehensive API upgrade and migration for the USDT-M Futures Trading System. This initiative marks a complete overhaul of our core trading infrastructure, designed to provide users with a higher-performing, more stable, and more standardized API service experience. The relevant arrangements are hereby announced as follows: I. Migration Timeline Note: Following the migration deadline, the old API version will be permanently discontinued. Any accounts that have not completed the migration will lose the ability to place orders, cancel orders, or execute other trading operations. Users are strongly advised to plan and execute their migration well in advance of this deadline. (Accounts that have already been upgraded to Multi-Assets Collateral Mode will not be affected by this migration.) II. Migration Scope III. Optimization Details This API upgrade delivers significant improvements across multiple dimensions: IV. Migration Guide (Recommended) Notes: 1. For accounts that have completed the mode upgrade (asset_mode=1 / asset_mode=2), private interfaces (trading, account, position, etc.) can only be accessed through V5 APIs. Old-version private interfaces will no longer be available. 2. Please prioritize the migration and regression testing of core interfaces such as order placement, cancellation, positions, and assets. It is recommended to begin as early as possible to avoid disruptions caused by concentrated migration activities near the deadline. V. Support Channels If you encounter any issues during the migration process, you can get support through any of the following channels: Thank you for your continued support and trust in HTX. If you have any questions, please reach out to our online customer service. HTX Team May 26, 2026(HTX)