Your API Access Key
The UTC timestamp of your request .e.g : 2020-12-08T09:08:57.715Z
The Base64-encoded signature (see Signing Messages subsection for details).
curl -L \ --url 'https://api.mefree.net/api/usdt/energy_used' \ --header 'MF-ACCESS-KEY: text' \ --header 'MF-ACCESS-TIMESTAMP: text' \ --header 'MF-ACCESS-SIGN: text'
{ "code": 1, "msg": "text", "sub_code": "text", "sub_msg": "text", "data": { "have_u": 1, "no_u": 1 } }