why the spot Partial Book Depth Streams don't have symbol ('s') key?

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1

subcribe for mutiple symbol, no way to tell which dict belong to which symbol?
palyload:

{
“lastUpdateId”: 160, // Last update ID
“bids”: [ // Bids to be updated
[
“0.0024”, // Price level to be updated
“10” // Quantity
]
],
“asks”: [ // Asks to be updated
[
“0.0026”, // Price level to be updated
“100” // Quantity
]
]
}

but with the derivatives Book Depth Streams , there is a ‘s’ key:

{
“e”: “depthUpdate”, // Event type
“E”: 1571889248277, // Event time
“T”: 1571889248276, // Transaction time
“s”: “BTCUSDT”,
“U”: 390497796, // First update ID in event
“u”: 390497878, // Final update ID in event
“pu”: 390497794, // Final update Id in last stream(ie u in last stream)
“b”: [ // Bids to be updated
[
“7403.89”, // Price Level to be updated
“0.002” // Quantity
]

so, how to solve this problem, don’t tell me use one ws connection with one symbol!!!

2

Hi @wisely, on Spot if you use /stream?streams=<stream1>,<stream2> to subscribe into your desired streams, there is always a stream field on the received data, so you can distinguish the received data.

You can implement this logic on your side, or use one of our recently released modular connectors (JS for example @binance/spot - npm).