# MEXC V2 API文档中鉴权处理（python版）

By [Outlaw_oracle](https://paragraph.com/@outlaw-oracle) · 2022-03-25

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        虽说MEXC已经出了v3版的API，但截至目前合约API尚未在v3版上线。当初写代码时，由于笔者对python的hmac等库不太熟悉，写到鉴权部分的代码时，遇到一些阻碍。因此将鉴权部分的代码写在这里，方便后之来者（
    
        通过`client = exchange_contactAPI(access_key='你的access_key字符串', secret_key='你的secret_key字符串')`调用即可。当然具体函数得自己写了。
    

    import hmac
    import time
    import json
    import requests
    
    
    class exchange_contactAPI:
        def __init__(self, access_key, secret_key):
            self.base_url = 'https://api.mexc.com'  #此为合约API的baseurl，如要使用现货API需改为'https://www.mexc.com'
            self.access_key = access_key
            self.secret_key = secret_key
    
        def get_auth(self, uri, params={}): #需要鉴权的GET请求，传入参数params为字典类型
            url = self.base_url + uri
            header = {}
            header['ApiKey'] = self.access_key
    
            timestamp_s = time.time()
            timestamp_ms_int = int(1000 * timestamp_s)
            header['Request-Time'] = str(timestamp_ms_int)
    
            params_str = '&'.join(["{}={}".format(i, params[i]) for i in sorted(params.keys())])
            signature_str = self.access_key + str(timestamp_ms_int) + params_str
            byte_key = self.secret_key.encode()
            byte_msg = signature_str.encode()
            signature = hmac.new(byte_key, byte_msg, digestmod='SHA256') #maybe exchange byte_key and |
            header['Signature'] = signature.hexdigest()
            header['Content-Type'] = 'application/json'
    
            res = requests.get(url=url, headers=header)
            return res.text
    
        def post_auth(self, uri, params={}):    #需要鉴权的POST请求
            url = self.base_url + uri
            header = {}
            header['ApiKey'] = self.access_key
    
            timestamp_s = time.time()
            timestamp_ms_int = int(1000 * timestamp_s)
            header['Request-Time'] = str(timestamp_ms_int)
    
            params_str = json.dumps('&'.join(["{}={}".format(i, params[i]) for i in sorted(params.keys())]))
            signature_str = self.access_key + str(timestamp_ms_int) + params_str
            byte_key = self.secret_key.encode()
            byte_msg = signature_str.encode()
            signature = hmac.new(byte_key, byte_msg, digestmod='SHA256')
            header['Signature'] = signature.hexdigest()
            header['Content-Type'] = 'application/json'
    
            res = requests.get(url=url, headers=header)
            return res.text

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*Originally published on [Outlaw_oracle](https://paragraph.com/@outlaw-oracle/mexc-v2-api-python)*