[Binance] The tickerPrice does not actually implement according to the API documentation.

[pipixi]

XChange/xchange-binance/src/main/java/org/knowm/xchange/binance/service/BinanceMarketDataServiceRaw.java

Line 152 in 6db82a3

return tickerAllPrices().stream()

Binance API supports giving the present symbol, why need to get all symbol?
https://github.com/binance/binance-spot-api-docs/blob/master/rest-api.md#symbol-price-ticker