async def fetch_ticker(self, symbol, params={}):
    (await self.load_markets())
    market = self.market(symbol)
    request = {'id': market['id']}
    response = (await self.publicGetMarketIdTick(self.extend(request, params)))
    return self.parse_ticker(response, market)
async def fetch_ticker(self, symbol, params={}):
    (await self.load_markets())
    market = self.market(symbol)
    request = {'id': market['id']}
    response = (await self.publicGetMarketIdTick(self.extend(request, params)))
    return self.parse_ticker(response, market)