import requests

headers = {
    'Authorization': 'Bearer %s' % api_token,
    'Accept':'application/json'
}

data = {
  	'asset' : 'USD',
  	'user_id': 'woshikeaidexiaoxiong'
}
response = requests.get('https://sandboxapi.legendtrading.com/app/balance', json=data, headers=headers)

data = response.json()
print(data)