Business Status Codes (Body status)

HTTP status is fixed to 200; read the business result from body status. All body status values are defined only here; individual APIs do not repeat them.

status	Meaning	Common scenarios
200	Success	Business completed
400	Parameter error	Missing/invalid Header or signing params; required fields empty (e.g. exchange/withdraw trade_sn, query without order ID)
401	Auth failed	Signature invalid, timestamp expired, nonce replay, application not found
403	Forbidden	IP not whitelisted, OpenAPI not enabled, abnormal account state
404	Not found	Order or receive account does not exist
500	System error	Quote/rate failure, create failure
503	Unavailable	API under maintenance
1403	Invalid quote / amount mismatch	Quote missing, expired, or amount does not match quote
1404	Illegal parameter	Invalid amount/precision, illegal currency, illegal notify_url, fee charge type not in enum
1405	Not configured / account abnormal	Rate not configured; pay/receive wallet missing; receive account inactive or address empty (contact ops)
1406	Risk control	Receive/withdraw amount below/above per-tx limit; fee ≥ submitted amount when deducting from payout
1407	Insufficient balance	Pay wallet available balance insufficient
1408	Duplicate order ID	Merchant trade_sn already exists
1409	Deduct amount mismatch	Withdraw deduct_amount does not match recalculated result