Rate Limit: Generally, the private interface rate limit of API key is at most 144 times every 3 seconds for each account (Trade Interface: at most 72 times every 3 seconds. Read Interface: at most 72 times every 3 seconds) (this rate limit is shared by all the altcoins contracts delivered by different date).
GET https://api.sunx.io/sapi/v1/position/lever?contract_code=BTC-USDT&margin_mode=cross&SignatureVersion=2&SignatureVersion=2&AccessKeyId=<your key>&Signature=<your signature>&SignatureMethod=HmacSHA256&Timestamp=2025-09-16T07%3A16%3A15