To enhance system security and standardize API usage, MEXC will update the generation rules for the clientTranId parameter used in the following fund transfer–related API endpoints, effective December 20, 2025, at 10:00 (UTC).
After the change takes effect, any request that does not meet the new format requirements will fail to be processed.
Affected Endpoints
POST /api/v3/capital/sub-account/universalTransfer
POST /api/v3/broker/sub-account/universalTransfer
Update Details
The generation rules for the clientTranId parameter will be updated as follows:
• Must be a string with a length of exactly 32 characters
• Must contain only English letters (a–z, A–Z) and numbers (0–9)
Examples
• Valid: A1b2C3d4E5f6G7h8I9j0K1l2M3n4O5p6
• Invalid: 12345 (insufficient length)
• Invalid: test_transfer_2024_001 (contains underscores)
• Invalid: 用户A转账给用户B-20240527 (contains non-English characters)
If you have any questions or require technical assistance, please join the MEXC API Telegram group at https://t.me/MEXCAPIsupport for 24/7 support.
